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Santhiravel S, Bekhit AEDA, Mendis E, Jacobs JL, Dunshea FR, Rajapakse N, Ponnampalam EN. The Impact of Plant Phytochemicals on the Gut Microbiota of Humans for a Balanced Life. Int J Mol Sci 2022; 23:ijms23158124. [PMID: 35897699 PMCID: PMC9332059 DOI: 10.3390/ijms23158124] [Citation(s) in RCA: 32] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2022] [Revised: 07/19/2022] [Accepted: 07/21/2022] [Indexed: 02/01/2023] Open
Abstract
The gastrointestinal tract of humans is a complex microbial ecosystem known as gut microbiota. The microbiota is involved in several critical physiological processes such as digestion, absorption, and related physiological functions and plays a crucial role in determining the host’s health. The habitual consumption of specific dietary components can impact beyond their nutritional benefits, altering gut microbiota diversity and function and could manipulate health. Phytochemicals are non-nutrient biologically active plant components that can modify the composition of gut microflora through selective stimulation of proliferation or inhibition of certain microbial communities in the intestine. Plants secrete these components, and they accumulate in the cell wall and cell sap compartments (body) for their development and survival. These compounds have low bioavailability and long time-retention in the intestine due to their poor absorption, resulting in beneficial impacts on gut microbiota population. Feeding diets containing phytochemicals to humans and animals may offer a path to improve the gut microbiome resulting in improved performance and/or health and wellbeing. This review discusses the effects of phytochemicals on the modulation of the gut microbiota environment and the resultant benefits to humans; however, the effect of phytochemicals on the gut microbiota of animals is also covered, in brief.
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Affiliation(s)
- Sarusha Santhiravel
- Postgraduate Institute of Agriculture, University of Peradeniya, Peradeniya 20400, Sri Lanka
- Department of Biochemistry, Memorial University of Newfoundland, St. John's, NL A1C 5S7, Canada
| | - Alaa El-Din A Bekhit
- Department of Food Sciences, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand
| | - Eresha Mendis
- Department of Food Science and Technology, Faculty of Agriculture, University of Peradeniya, Peradeniya 20400, Sri Lanka
| | - Joe L Jacobs
- Animal Production Sciences, Agriculture Victoria Research, Department of Jobs, Precincts and Regions, Ellinbank, VIC 3821, Australia
- Centre for Agricultural Innovation, School of Agriculture and Food, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, VIC 3010, Australia
| | - Frank R Dunshea
- School of Agriculture and Food, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, VIC 3010, Australia
- Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, UK
| | - Niranjan Rajapakse
- Department of Food Science and Technology, Faculty of Agriculture, University of Peradeniya, Peradeniya 20400, Sri Lanka
| | - Eric N Ponnampalam
- Animal Production Sciences, Agriculture Victoria Research, Department of Jobs, Precincts and Regions, Bundoora, VIC 3083, Australia
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Williams SRO, Milner TC, Garner JB, Moate PJ, Jacobs JL, Hannah MC, Wales WJ, Marett LC. Dietary Fat and Betaine Supplements Offered to Lactating Cows Affect Dry Matter Intake, Milk Production and Body Temperature Responses to an Acute Heat Challenge. Animals (Basel) 2021; 11:ani11113110. [PMID: 34827840 PMCID: PMC8614460 DOI: 10.3390/ani11113110] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Revised: 10/27/2021] [Accepted: 10/27/2021] [Indexed: 01/13/2023] Open
Abstract
Simple Summary Hot weather is associated with reduced milk yield of dairy cows. Supplementing the diet of lactating cows with ingredients that increase dietary energy density or that reduce internal heat production, may reduce some of the negative impacts of hot weather on milk yield. We used controlled-climate chambers to simulate a short hot-weather event and measured changes in milk yield, feed intake, and body temperature of cows fed either a fat supplement, betaine or a combination of both. Feeding cows fat resulted in improved milk production but also increased body temperature and caused a decrease in feed intake. Feeding betaine did not affect milk yield but did reduce cow body temperature at times. Contrary to our expectations, the combination of fat and betaine supplements did not result in a clear benefit in terms of milk production or body temperature. Further work is warranted to understand the interactions between dietary fat type and betaine supplements when offered to cows during periods of hot weather. Abstract Supplementing the diet of lactating cows with ingredients that increase energy density, or reduce internal heat production, may reduce some of the negative impacts of hot weather on milk yield. Thirty-two dairy cows were assigned either: (1) basal diet only, (2) basal diet plus canola oil, (3) basal diet plus betaine, or (4) basal diet plus canola oil and betaine. The basal diet was lucerne hay, pasture silage, and grain. Cows were exposed to a four-day heat challenge (temperature-humidity index 74 to 84) in controlled-environment chambers. Canola oil supplementation increased milk production (22.0 vs. 18.7 kg/d) across all periods of our experiment and increased body temperature (39.6 vs. 39.0 °C) during the heat challenge. Betaine supplementation reduced maximum body temperature during the pre-challenge period (39.2 vs. 39.6 °C) but not during the heat challenge (40.3 °C). Cows fed canola oil had greater declines in dry matter intake (5.4 vs 2.7 kg DM) and energy corrected milk (1.3 vs. 1.0 kg) from the pre-challenge to the heat challenge than other cows. Contrary to our expectations, the combination of fat and betaine supplements did not result in a clear benefit in terms of milk production or body temperature. Further work is warranted to understand the interactions between diet and hot weather.
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Affiliation(s)
- S. Richard O. Williams
- Agriculture Victoria Research, Ellinbank, VIC 3821, Australia; (T.C.M.); (J.B.G.); (P.J.M.); (J.L.J.); (M.C.H.); (W.J.W.); (L.C.M.)
- Correspondence:
| | - Tori C. Milner
- Agriculture Victoria Research, Ellinbank, VIC 3821, Australia; (T.C.M.); (J.B.G.); (P.J.M.); (J.L.J.); (M.C.H.); (W.J.W.); (L.C.M.)
| | - Josie B. Garner
- Agriculture Victoria Research, Ellinbank, VIC 3821, Australia; (T.C.M.); (J.B.G.); (P.J.M.); (J.L.J.); (M.C.H.); (W.J.W.); (L.C.M.)
| | - Peter J. Moate
- Agriculture Victoria Research, Ellinbank, VIC 3821, Australia; (T.C.M.); (J.B.G.); (P.J.M.); (J.L.J.); (M.C.H.); (W.J.W.); (L.C.M.)
- Centre for Agricultural Innovation, School of Agriculture and Food, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Melbourne, VIC 3010, Australia
| | - Joe L. Jacobs
- Agriculture Victoria Research, Ellinbank, VIC 3821, Australia; (T.C.M.); (J.B.G.); (P.J.M.); (J.L.J.); (M.C.H.); (W.J.W.); (L.C.M.)
- Centre for Agricultural Innovation, School of Agriculture and Food, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Melbourne, VIC 3010, Australia
| | - Murray C. Hannah
- Agriculture Victoria Research, Ellinbank, VIC 3821, Australia; (T.C.M.); (J.B.G.); (P.J.M.); (J.L.J.); (M.C.H.); (W.J.W.); (L.C.M.)
| | - William J. Wales
- Agriculture Victoria Research, Ellinbank, VIC 3821, Australia; (T.C.M.); (J.B.G.); (P.J.M.); (J.L.J.); (M.C.H.); (W.J.W.); (L.C.M.)
- Centre for Agricultural Innovation, School of Agriculture and Food, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Melbourne, VIC 3010, Australia
| | - Leah C. Marett
- Agriculture Victoria Research, Ellinbank, VIC 3821, Australia; (T.C.M.); (J.B.G.); (P.J.M.); (J.L.J.); (M.C.H.); (W.J.W.); (L.C.M.)
- Centre for Agricultural Innovation, School of Agriculture and Food, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Melbourne, VIC 3010, Australia
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Ponnampalam EN, Knight MI, Moate PJ, Jacobs JL. An alternative approach for sustainable sheep meat production: implications for food security. J Anim Sci Biotechnol 2020; 11:83. [PMID: 32685146 PMCID: PMC7362406 DOI: 10.1186/s40104-020-00472-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Accepted: 05/17/2020] [Indexed: 11/17/2022] Open
Abstract
Background A pelleted diet containing camelina hay (CAMH) or camelina meal (CAMM) as a supplement along with a control pellet (CONT) diet formulated with commonly available feeds during summer was used to investigate an alternative pathway for sustainable meat production. Sustainable meat production was based on a simple estimation of income from meat produced versus feed costs if animals were fed for an extended period over summer compared to early slaughter at the beginning of summer. Eighty maternal composite wether lambs (Composite) based on Coopworth genetics and 80 pure Merino wether yearlings were divided into 10 groups within breed (n = 8) using stratified randomisation based on liveweights. Following 1 week of adaptation to experimental diets, animals were fed experimental diets for up to10 weeks. Results Animals were slaughtered after either 8, 9 or 10 weeks of full feeding when the average liveweight of diet/genetic combination reached a weight appropriate for either ‘heavy lamb’ or ‘heavy hogget’ production, which occurred between 8 and 10 weeks of full feeding. There was no diet × breed interactions except for dressing percentage (DP), where Composite lambs fed the CAMH diet had the greatest DP (48.1 ± 0.35) and the Merino yearlings fed the CAMM diet the lowest DP (45.8 ± 0.33). Composite lambs gained 17.6–20.3 kg and Merino yearlings gained 10.7–12.9 kg liveweight. Based on their DP, this resulted in the production of approximately 8.3–9.5 kg additional carcass weight in Composites and 4.9–5.7 kg in Merinos, which in turn produced greater profit per Composite lamb and a small profit per Merino yearling. Conclusions Composite lambs fed CAMM and CAMH had 5% greater carcass weights at slaughter compared to the CONT group, but dietary treatments did not change carcass weight of Merino yearlings at slaughter. The extended feeding approach offered the producer an estimated economic gain of AUD $20.00 to $25.00 when yearly average prices were used (Method 1) and AUD $40.00 to $47.70 when pre- and post-summer average prices were used (Method 2) per Composite lambs, but extra carcass gain did not result in the same profit per Merino yearling. Among the Composites, the profit for animals fed the CAMH and CAMM were AUD $2.75 to $4.50 greater than CONT group when full year average prices were applied while AUD $3.50 to $5.50 greater than CONT group when pre- and post-summer average prices were applied. However, we acknowledge a combination approach of extended feeding for a portion of animals already on ground and selling the remaining animals pre-summer with joining of additional ewes is the most likely strategy. Considering the scenario of extended feeding for 3 weeks, based on the growth rates observed for Composite lambs, if an additional 2 kg carcass weight per animal can be gained for 50% of the 22 million lambs slaughtered in Australia (= 11 million animals), it would potentially supply an additional 22 million kg of lamb carcasses produced per annum. This is equivalent to producing an extra 1 million lamb carcasses per annum weighing 22 kg each. Feeding Composite lambs for an extended period and selling Merino yearlings pre-summer may be a good option due to faster growth rate of Composites that may help quick turn-over to market.
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Affiliation(s)
- Eric N Ponnampalam
- Animal Production Sciences, Agriculture Victoria Research, Department of Jobs, Precincts and Regions, Bundoora, VIC 3083 Australia
| | - Matthew I Knight
- Animal Production Sciences, Agriculture Victoria Research, Department of Jobs, Precincts and Regions, Hamilton, VIC 3300 Australia
| | - Peter J Moate
- Animal Production Sciences, Agriculture Victoria Research, Department of Jobs, Precincts and Regions, Ellinbank, Victoria 3821 Australia.,Centre for Agricultural Innovation, School of Agriculture and Food, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Melbourne, Victoria 3010 Australia
| | - Joe L Jacobs
- Animal Production Sciences, Agriculture Victoria Research, Department of Jobs, Precincts and Regions, Ellinbank, Victoria 3821 Australia.,Centre for Agricultural Innovation, School of Agriculture and Food, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Melbourne, Victoria 3010 Australia
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Moate PJ, Jacobs JL, Hixson JL, Deighton MH, Hannah MC, Morris GL, Ribaux BE, Wales WJ, Williams SRO. Effects of Feeding either Red or White Grape Marc on Milk Production and Methane Emissions from Early-Lactation Dairy Cows. Animals (Basel) 2020; 10:ani10060976. [PMID: 32512732 PMCID: PMC7341285 DOI: 10.3390/ani10060976] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Revised: 05/30/2020] [Accepted: 06/01/2020] [Indexed: 12/28/2022] Open
Abstract
Simple Summary Grape marc comprises the skins, seeds and stems of grapes remaining after grapes are pressed to make wine. Globally, about nine million tonnes of grape marc are produced annually. However, little is known about the comparative nutritional value of grape marc from red and white grapes and their effects on milk production and methane emissions when fed to dairy cows. Our experiment assessed the potential role of grape marc as a feed source for the grazing based, Australian dairy industry. We fed diets based on harvested perennial ryegrass to lactating dairy cows and compared milk production and methane emissions when grape marc from either red or white grapes was substituted for some of the perennial ryegrass. Diets containing grape marc from either red or white grapes equally decreased milk yields by approximately 10% and methane emissions by 15%. When fed to dairy cows, grape marc reduces methane emissions but at the cost of decreased milk production. The effects on methane emissions were mainly mediated by the high concentrations of lignin and fat in grape marc while decreased milk production was due to decreased intake of metabolizable energy. Abstract Globally, annual production of grape marc (GM), the residue of skins, seeds and stems remaining after making wine, has been estimated to be approximately nine million tonnes. No previous studies have compared effects on milk production and methane emissions when GM from either red or white grapes was fed to dairy cows. This experiment examines the effects of partial replacement of a perennial ryegrass (Lolium perenne L.) based diet with GM from either red or white grapes on yield and composition of milk and methane emissions. Thirty-two Holstein dairy cows in early lactation were offered either a control diet containing 15.0 kg dry matter (DM) of freshly harvested perennial ryegrass and 5.2 kg of a concentrate mix, or a diet similar to the control diet but with 5 kg DM of ryegrass replaced with 5 kg DM of GM from red grapes (RGM), or a diet similar to the RGM diet except the GM was from white grapes (WGM). Individual cow feed intakes, milk yields, and methane emissions were measured. Both diets containing GM decreased milk yields by approximately 10% and methane emissions by 15%. When fed to dairy cows, GM reduces methane emissions but at the cost of decreased milk production.
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Affiliation(s)
- Peter J. Moate
- Agriculture Victoria Research, Ellinbank VIC 3821, Australia; (J.L.J.); (M.H.D.); (M.C.H.); (G.L.M.); (B.E.R.); (W.J.W.); (S.R.O.W.)
- Centre for Agricultural Innovation, School of Agriculture and Food, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Victoria 3010, Australia
- Correspondence: ; Tel.: +61-3-5624-2222
| | - Joe L. Jacobs
- Agriculture Victoria Research, Ellinbank VIC 3821, Australia; (J.L.J.); (M.H.D.); (M.C.H.); (G.L.M.); (B.E.R.); (W.J.W.); (S.R.O.W.)
- Centre for Agricultural Innovation, School of Agriculture and Food, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Victoria 3010, Australia
| | - Josh L. Hixson
- The Australian Wine Research Institute, P.O. Box 197, Glen Osmond, Adelaide 5064, Australia;
| | - Matthew H. Deighton
- Agriculture Victoria Research, Ellinbank VIC 3821, Australia; (J.L.J.); (M.H.D.); (M.C.H.); (G.L.M.); (B.E.R.); (W.J.W.); (S.R.O.W.)
- Cropmark, 49 Manion Road, Rolleston 7677, New Zealand
| | - Murray C. Hannah
- Agriculture Victoria Research, Ellinbank VIC 3821, Australia; (J.L.J.); (M.H.D.); (M.C.H.); (G.L.M.); (B.E.R.); (W.J.W.); (S.R.O.W.)
| | - Greg L. Morris
- Agriculture Victoria Research, Ellinbank VIC 3821, Australia; (J.L.J.); (M.H.D.); (M.C.H.); (G.L.M.); (B.E.R.); (W.J.W.); (S.R.O.W.)
| | - Brigid E. Ribaux
- Agriculture Victoria Research, Ellinbank VIC 3821, Australia; (J.L.J.); (M.H.D.); (M.C.H.); (G.L.M.); (B.E.R.); (W.J.W.); (S.R.O.W.)
| | - William J. Wales
- Agriculture Victoria Research, Ellinbank VIC 3821, Australia; (J.L.J.); (M.H.D.); (M.C.H.); (G.L.M.); (B.E.R.); (W.J.W.); (S.R.O.W.)
- Centre for Agricultural Innovation, School of Agriculture and Food, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Victoria 3010, Australia
| | - S. Richard O. Williams
- Agriculture Victoria Research, Ellinbank VIC 3821, Australia; (J.L.J.); (M.H.D.); (M.C.H.); (G.L.M.); (B.E.R.); (W.J.W.); (S.R.O.W.)
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Roth MG, Jacobs JL, Napieralski S, Byrne AM, Stouffer-Hopkins A, Warner F, Chilvers MI. Fluopyram Suppresses Population Densities of Heterodera glycines in Field and Greenhouse Studies in Michigan. Plant Dis 2020; 104:1305-1311. [PMID: 32155114 DOI: 10.1094/pdis-04-19-0874-re] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The soybean cyst nematode (SCN), Heterodera glycines Ichinohe, causes significant damage to soybean production annually. Fluopyram is a fungicide commonly used in soybean seed treatments intended to control soilborne fungal pathogens; however, recent studies have also suggested inhibitory effects on SCN. We examined the effects of a fluopyram seed treatment, ILeVO, on SCN reproduction, sudden death syndrome (SDS) development, and yield in a 3-year field study. Overall, fluopyram had a significant effect on yield (P = 0.046) and end-of-season SCN eggs and second-stage juveniles (Pf, P = 0.033) but no significant effect on SCN reproduction (Rf) or SDS disease index (P > 0.05). Post hoc tests indicated that fluopyram increased yield and suppressed SCN quantities. However, Rf was consistently greater than 1 whether or not the seed was treated with fluopyram, indicating that SCN populations were still increasing in the presence of fluopyram. A follow-up greenhouse study indicated that fluopyram reduced SCN relative to nontreated controls, as observed in the field, but only reduced SCN DNA within roots of a susceptible cultivar. These results indicate that fluopyram can suppress SCN quantities relative to nontreated seed but may not successfully reduce nematode populations without the use of additional management strategies.
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Affiliation(s)
- M G Roth
- Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, MI 48824, U.S.A
- Genetics Graduate Program, Michigan State University, East Lansing, MI 48824, U.S.A
| | - J L Jacobs
- Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, MI 48824, U.S.A
| | - S Napieralski
- Department of Geoscience, University of Wisconsin-Madison, Madison, WI 53706, U.S.A
| | - A M Byrne
- Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, MI 48824, U.S.A
| | - A Stouffer-Hopkins
- Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, MI 48824, U.S.A
| | - F Warner
- Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, MI 48824, U.S.A
| | - M I Chilvers
- Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, MI 48824, U.S.A
- Genetics Graduate Program, Michigan State University, East Lansing, MI 48824, U.S.A
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Ponnampalam EN, Jacobs JL, Knight MI, Plozza TE, Butler KL. Understanding the action of muscle iron concentration on dark cutting: An important aspect affecting consumer confidence of purchasing meat. Meat Sci 2020; 167:108156. [PMID: 32428808 DOI: 10.1016/j.meatsci.2020.108156] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Revised: 04/21/2020] [Accepted: 04/21/2020] [Indexed: 11/15/2022]
Abstract
We investigated the association of muscle iron concentration, in addition to ultimate pH (pHU), on dark meat formation in sheep of different breeds fed forage-based diets. At 1 h simulated display, redness of meat (a*-value) increased (P < .0001) by about 3 units as the iron concentration increased from 10 to 22 mg/kg of meat, whereas the a*-value decreased by 2 units as pHU increased from 5.5 to 6.2 in fresh meat (P < .0001). After 90 days storage the corresponding responses were about 2 units increase for iron concentration and about 1 unit decrease for pHU, respectively. The results clearly show that increased muscle iron concentration was strongly associated with reduced dark cutting in fresh and stored meat evaluated at 1 h simulated display. We conclude that it may be desirable to measure iron concentration, along with pHU, for evaluation of the potential for carcasses to produce dark cutting meat, and for the meat to turn brown during display.
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Affiliation(s)
- Eric N Ponnampalam
- Animal Production Sciences, Agriculture Victoria Research, Department of Jobs, Precincts and Regions, Bundoora, VIC 3083, Australia.
| | - Joe L Jacobs
- Animal Production Sciences, Agriculture Victoria Research, Department of Jobs, Precincts and Regions, Ellinbank, VIC 3821, Australia; Centre for Agricultural Innovation, School of Agriculture and Food, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, VIC 3010, Australia
| | - Matthew I Knight
- Animal Production Sciences, Agriculture Victoria Research, Department of Jobs, Precincts and Regions, Hamilton, VIC 3300, Australia
| | - Tim E Plozza
- Chemistry, Agriculture Victoria Research, Department of Jobs, Precincts and Regions, Macleod, VIC 3085, Australia
| | - Kym L Butler
- Biometrics, Agriculture Victoria Research, Department of Jobs, Precincts and Regions, Hamilton, VIC 3300, Australia
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Williams SRO, Hannah MC, Jacobs JL, Wales WJ, Moate PJ. Volatile Fatty Acids in Ruminal Fluid Can Be Used to Predict Methane Yield of Dairy Cows. Animals (Basel) 2019; 9:E1006. [PMID: 31757116 PMCID: PMC6941164 DOI: 10.3390/ani9121006] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2019] [Accepted: 11/13/2019] [Indexed: 11/16/2022] Open
Abstract
The dry matter intake (DMI) of forage-fed cattle can be used to predict their methane emissions. However, many cattle are fed concentrate-rich diets that decrease their methane yield. A range of equations predicting methane yield exist, but most use information that is generally unavailable when animals are fed in groups or grazing. The aim of this research was to develop equations based on proportions of ruminal volatile-fatty-acids to predict methane yield of dairy cows fed forage-dominant as well as concentrate-rich diets. Data were collated from seven experiments with a total of 24 treatments, from 215 cows. Forage in the diets ranged from 440 to 1000 g/kg. Methane was measured either by open-circuit respiration chambers or a sulfur hexafluoride (SF6) technique. In all experiments, ruminal fluid was collected via the mouth approximately four hours after the start of feeding. Seven prediction equations were tested. Methane yield (MY) was equally best predicted by the following equations: MY = 4.08 × (acetate/propionate) + 7.05; MY = 3.28 × (acetate + butyrate)/propionate + 7.6; MY = 316/propionate + 4.4. These equations were validated against independent published data from both dairy and beef cattle consuming a wide range of diets. A concordance of 0.62 suggests these equations may be applicable for predicting methane yield from all cattle and not just dairy cows, with root mean-square error of prediction of 3.0 g CH4/kg dry matter intake.
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Affiliation(s)
- S. Richard O. Williams
- Agriculture Victoria Research, Ellinbank, VIC 3821, Australia; (M.C.H.); (J.L.J.); (W.J.W.); (P.J.M.)
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Alvarez-Hess PS, Moate PJ, Williams SRO, Jacobs JL, Beauchemin KA, Durmic Z, Hannah MC, Eckard RJ. The effect of diet of the donor cows on in vitro measurements of methane production from wheat and corn incubated in various forage-to-grain ratios. J Sci Food Agric 2019; 99:3451-3458. [PMID: 30609046 DOI: 10.1002/jsfa.9563] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2018] [Revised: 11/22/2018] [Accepted: 01/02/2019] [Indexed: 06/09/2023]
Abstract
BACKGROUND Supplementation of ruminant diets with wheat and corn grains influences ruminal fermentation. In vitro fermentation is a methodology that can be used to screen feeds for their potential to produce enteric methane. However, there is evidence that the diet of the donor cows could impact the results of in vitro analysis. This research investigated the in vitro fermentation of wheat and corn grain when incubated in ruminal fluid from cows fed different grain types and different forage-to-grain ratios. RESULTS The type of grain fed to the donor cows, as well as forage-to-grain ratio, affected the outcome of fermentation of wheat and corn grain. Differences in methane production (MP) between grains were only observed when incubated with ruminal fluid adapted to each specific grain type. Increasing proportions of wheat but not of corn decreased in vitro MP in a linear manner compared with MP produced from forage only. CONCLUSIONS Wheat grain has a greater in vitro antimethanogenic effect than corn. However, to detect the different fermentations between wheat and corn, grains should be incubated in ruminal fluid from cows adapted to that specific grain type. © 2019 Society of Chemical Industry.
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Affiliation(s)
- Pablo S Alvarez-Hess
- Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, VIC, Australia
- Agriculture Victoria , Department of Jobs, Precincts and Regions, Ellinbank, VIC, Australia
| | - Peter J Moate
- Agriculture Victoria , Department of Jobs, Precincts and Regions, Ellinbank, VIC, Australia
| | - S Richard O Williams
- Agriculture Victoria , Department of Jobs, Precincts and Regions, Ellinbank, VIC, Australia
| | - Joe L Jacobs
- Agriculture Victoria , Department of Jobs, Precincts and Regions, Ellinbank, VIC, Australia
| | - Karen A Beauchemin
- Lethbridge Research and Development Centre, Agriculture and Agri-Food Canada, Lethbridge, AB, Canada
| | - Zoey Durmic
- School of Agriculture and Environment, The University of Western Australia M085, Crawley, WA, Australia
| | - Murray C Hannah
- Agriculture Victoria , Department of Jobs, Precincts and Regions, Ellinbank, VIC, Australia
| | - Richard J Eckard
- Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, VIC, Australia
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Ponnampalam EN, Vahedi V, Giri K, Lewandowski P, Jacobs JL, Dunshea FR. Muscle Antioxidant Enzymes Activity and Gene Expression Are Altered by Diet-Induced Increase in Muscle Essential Fatty Acid (α-linolenic acid) Concentration in Sheep Used as a Model. Nutrients 2019; 11:E723. [PMID: 30925775 PMCID: PMC6521022 DOI: 10.3390/nu11040723] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2019] [Revised: 03/25/2019] [Accepted: 03/26/2019] [Indexed: 12/30/2022] Open
Abstract
This study investigated the effect of dietary manipulations on muscle fatty acid composition, the activities and relative mRNA expressions of antioxidant enzymes and the relationship between muscle enzyme activity or mRNA expression and alpha linolenic acid (ALA) concentration in sheep. Eighty-four lambs blocked on liveweight were randomly allocated to four dietary treatments, lucerne pasture (Lucerne), annual ryegrass pasture (Ryegrass), feedlot pellets (Feedlot) or annual ryegrass plus feedlot pellets (RyeFeedlot). After six weeks of feeding, lambs were slaughtered and within 30 min post-mortem, samples collected from the longissimus lumborum (LL) muscle for RNA isolation and measurement of antioxidant enzyme activities. At 24 h post-mortem, LL samples were collected for determination of fatty acid concentrations. Feedlot treatment decreased ALA, eicosapentaenoic (EPA), docosapentaenoic (DPA) and docosahexaenoic (DHA) concentrations compared with other treatments and increased linoleic acid (LA) and arachidonic acid (AA) compared with Lucerne and Ryegrass (p < 0.001). The activity of Glutathione peroxidase (GPX1, p < 0.001) and Superoxide dismutase (SOD2, p < 0.001) enzymes in the muscle increased with Lucerne compared to other treatments. Lucerne increased muscle gpx1 mRNA expression by 1.74-fold (p = 0.01) and 1.68-fold (p = 0.05) compared with Feedlot and other diets, respectively. The GPX1 (r² = 0.319, p = 0.002) and SOD2 (r² = 0.244, p = 0.009) enzyme activities were positively related to ALA. There was a positive linear relationship between muscle gpx1 (r² = 0.102, p = 0.017) or sod2 (r² = 0.049, p = 0.09) mRNA expressions and ALA concentration. This study demonstrates that diet can affect concentrations of ALA and other fatty acids as well as change activities and gene expression of antioxidant enzymes in muscle. Increased antioxidant activity may, in turn, have beneficial effects on the performance, health and wellbeing of animals and humans.
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Affiliation(s)
- Eric N Ponnampalam
- Animal Production Sciences, Agriculture Victoria Research, Department of Jobs, Precincts and Regions, Bundoora VIC 3083, Australia.
| | - Vahid Vahedi
- Department of Animal Science, Moghan College of Agriculture and Natural Resources, University of Mohaghegh Ardabili, Ardabil 56971-94781, Iran.
| | - Khageswor Giri
- Animal Production Sciences, Agriculture Victoria Research, Department of Jobs, Precincts and Regions, Bundoora VIC 3083, Australia.
| | | | - Joe L Jacobs
- Animal Production Sciences, Agriculture Victoria Research, Department of Jobs, Precincts and Regions, Ellinbank VIC 3821, Australia.
| | - Frank R Dunshea
- Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville VIC 3010, Australia.
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10
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Alvarez-Hess PS, Williams SRO, Jacobs JL, Hannah MC, Beauchemin KA, Eckard RJ, Wales WJ, Morris GL, Moate PJ. Effect of dietary fat supplementation on methane emissions from dairy cows fed wheat or corn. J Dairy Sci 2019; 102:2714-2723. [PMID: 30660414 DOI: 10.3168/jds.2018-14721] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2018] [Accepted: 11/21/2018] [Indexed: 11/19/2022]
Abstract
Diets that contain high proportions of either wheat or supplementary fat have been individually reported to reduce enteric methane production. The objective of this research was to determine the effect of dietary fat supplementation on methane emissions and milk yield from cows fed diets containing either corn or wheat grains. It was hypothesized that cows fed a diet containing wheat would produce less methane and have lower methane yield (methane per kg of dry matter intake; MY) than cows fed a diet containing corn and that methane mitigation from fat supplementation would occur irrespective of the type of grain in the basal diet. The experiment involved 32 Holstein-Friesian dairy cows allocated to 1 of 4 treatment groups (n = 8) and individually fed different diets restricted to approximately 90% of their mean ad libitum intake measured during a covariate period. All animals were offered 11.5 kg of dry matter/d of alfalfa hay, 1.8 kg of dry matter/d of solvent-extracted canola meal, and 1 of 4 dietary supplements. Dietary supplements were 8 kg of dry matter/d of either corn or wheat, or these same treatments with the addition of 0.8 kg of canola oil. In this 5-wk experiment, d 1 to 7 served as the covariate period, d 8 to 14 as the transition period, d 15 to 28 as the adaptation period, and d 29 to 35 as the experimental period. Cows were fed their full treatment diets from d 15 to 35 during which time milk production and feed intake were measured daily. During d 29 to 35, methane production was measured for individual cows daily using the sulfur hexafluoride tracer method. The resulting averages for milk production and feed intake were analyzed by analysis of covariance with factorial grain by fat as treatment structure, animal as the unit within blocks, and the corresponding milk production or feed intake covariate averages as principal covariate. Data on milk fatty acids, ruminal fluid data on pH, ammonia, volatile fatty acids, protozoa, and methane were analyzed by ANOVA using the same treatment and blocking structures excluding the principal covariate. Cows fed a diet containing wheat had greater MY than cows fed a diet containing corn. Irrespective of the type of grain in the diet, increasing the fat concentration from 2 to 6% dry matter reduced MY. It is concluded that the grain component in the basal diet does not affect the mitigating effects of dietary fat supplements on MY.
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Affiliation(s)
- P S Alvarez-Hess
- Faculty of Veterinary and Agricultural Science, The University of Melbourne, Parkville, Victoria 3010, Australia; Agriculture Research, Department of Economic Development, Jobs, Transport and Resources, Ellinbank, Victoria 3821, Australia.
| | - S R O Williams
- Agriculture Research, Department of Economic Development, Jobs, Transport and Resources, Ellinbank, Victoria 3821, Australia
| | - J L Jacobs
- Agriculture Research, Department of Economic Development, Jobs, Transport and Resources, Ellinbank, Victoria 3821, Australia
| | - M C Hannah
- Agriculture Research, Department of Economic Development, Jobs, Transport and Resources, Ellinbank, Victoria 3821, Australia
| | - K A Beauchemin
- Agriculture and Agri-Food Canada, Lethbridge, Alberta, Canada T1J 4B1
| | - R J Eckard
- Faculty of Veterinary and Agricultural Science, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - W J Wales
- Agriculture Research, Department of Economic Development, Jobs, Transport and Resources, Ellinbank, Victoria 3821, Australia
| | - G L Morris
- Agriculture Research, Department of Economic Development, Jobs, Transport and Resources, Ellinbank, Victoria 3821, Australia
| | - P J Moate
- Agriculture Research, Department of Economic Development, Jobs, Transport and Resources, Ellinbank, Victoria 3821, Australia
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11
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Alvarez Hess PS, Eckard RJ, Jacobs JL, Hannah MC, Moate PJ. Comparison of five methods for the estimation of methane production from vented in vitro systems. J Sci Food Agric 2019; 99:109-116. [PMID: 29797341 DOI: 10.1002/jsfa.9149] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2017] [Revised: 04/07/2018] [Accepted: 05/20/2018] [Indexed: 06/08/2023]
Abstract
BACKGROUND There are several methods for estimating methane production (MP) from feedstuffs in vented in vitro systems. One method (A; 'gold standard') measures methane proportions in the incubation bottle's headspace (HS) and in the vented gas collected in gas bags. Four other methods (B, C, D and E) measure methane proportion in a single gas sample from the HS. Method B assumes the same methane proportion in the vented gas as in the HS, method C assumes constant methane to carbon dioxide ratio, method D has been developed based on empirical data, and method E assumes constant individual venting volumes. This study aimed to compare the MP predictions from these methods to that of the gold standard method under different incubation scenarios, to validate these methods based on their concordance with a gold-standard method. RESULTS Methods C, D and E had greater concordance (0.85, 0.88 and 0.81), lower root-mean-square error (RMSE; 0.80, 0.72 and 0.85) and lower mean bias (0.20, 0.35, -0.35) with the gold standard than did method B (concordance 0.67, RMSE 1.49 and mean bias 1.26). Methods D and E were simpler to perform than method C, and method D was slightly more accurate than method E. CONCLUSION Based on precision, accuracy and simplicity of implementation, it is recommended that, when method A cannot be used, methods D and E are preferred to estimate MP from vented in vitro systems. © 2018 Society of Chemical Industry.
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Affiliation(s)
- Pablo S Alvarez Hess
- Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, Australia
| | - Richard J Eckard
- Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, Australia
| | - Joe L Jacobs
- Department of Economic Development, Jobs, Transport and Resources, Agriculture Victoria, Ellinbank, Australia
| | - Murray C Hannah
- Department of Economic Development, Jobs, Transport and Resources, Agriculture Victoria, Ellinbank, Australia
| | - Peter J Moate
- Department of Economic Development, Jobs, Transport and Resources, Agriculture Victoria, Ellinbank, Australia
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12
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Abstract
This review discusses the importance of red meat from ruminants as a source of omega-3 (n-3) fatty acids (FAs) for human life in the context of the contribution of animals to human welfare. Red meat is a valuable food commodity for human life because it is naturally rich in key nutrients such as protein, trace elements, vitamins and essential FAs. In developed countries and high socio-economic groups from developing countries, red meat intake is greater than that of oily fish, owing to availability, preference and affordability. Omega-3 FA concentration is higher in red meat (beef, lamb and mutton) than in white meat (pork, poultry and turkey), due to the fibre types present in muscle tissues and the specialised digestive systems of ruminants. There is mounting evidence that regular consumption of n-3 FAs is beneficial for growth and development as well as the health and welfare of humans of all ages. The dietary background of ruminants significantly influences the concentration of n-3 FAs in red meat. Meat from forage- or grassfed ruminants has a greater concentration of n-3 FAs than that from their feedlot or grain-fed counterparts and can also offer a favourable n-6:n-3 ratio in the meat. Scientific literature shows that the advantages of consuming n-3 FAs enriched meat (foods) outweigh the disadvantages.
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13
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Ponnampalam EN, Kerr MG, Butler KL, Cottrell JJ, Dunshea FR, Jacobs JL. Filling the out of season gaps for lamb and hogget production: Diet and genetic influence on carcass yield, carcass composition and retail value of meat. Meat Sci 2018; 148:156-163. [PMID: 30388480 DOI: 10.1016/j.meatsci.2018.08.027] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2018] [Revised: 08/31/2018] [Accepted: 08/31/2018] [Indexed: 10/28/2022]
Abstract
This study investigated the use of camelina forage and meal supplementation to a finishing diet on carcass traits, composition and retail value of lamb and hoggets. The metabolisable energy and crude protein concentrations of all 3 diets were 10-11 MJ/kg DM and 14-15% CP. Thirty maternal Composite wether lambs (28-38 kg) and 30 Merino wether hoggets (37-43 kg) were used in a 3 × 2 factorial experiment. Animals were slaughtered after 10 weeks of feeding with carcasses classified as 'Heavy lamb' or 'Heavy hogget' (>22 kg carcass weight). Carcass traits, composition, meat mineral concentrations and retail colour were measured. Camelina diets increased liveweight (P < 0.02) and carcass weight (P < 0.002) for both sheep types. Carcass weight (P < 0.005) and dressing % (P < 0.01) were lower for Merino hoggets than Composite lambs. Mineral concentration and retail colour stability of fresh meat were unaffected by diet, with 72 h retail colour considered acceptable for consumers.
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Affiliation(s)
- E N Ponnampalam
- Animal Production Science, Agriculture Victoria Research, Department of Economic Development, Jobs, Transport and Resources, Bundoora, VIC 3083, Australia.
| | - M G Kerr
- Animal Production Science, Agriculture Victoria Research, Department of Economic Development, Jobs, Transport and Resources, Bundoora, VIC 3083, Australia
| | - K L Butler
- Biometrics Group, Agriculture Victoria Research, Department of Economic Development, Jobs, Transport and Resources, Hamilton, VIC 3300, Australia
| | - J J Cottrell
- Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, VIC 3010, Australia
| | - F R Dunshea
- Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, VIC 3010, Australia
| | - J L Jacobs
- Animal Production Science, Agriculture Victoria Research, Department of Economic Development, Jobs, Transport and Resources, Ellinbank, VIC 3821, Australia
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14
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Moate PJ, Jacobs JL, Hannah MC, Morris GL, Beauchemin KA, Alvarez Hess PS, Eckard RJ, Liu Z, Rochfort S, Wales WJ, Williams SRO. Adaptation responses in milk fat yield and methane emissions of dairy cows when wheat was included in their diet for 16 weeks. J Dairy Sci 2018; 101:7117-7132. [PMID: 29729908 DOI: 10.3168/jds.2017-14334] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Accepted: 03/21/2018] [Indexed: 11/19/2022]
Abstract
Short-term studies have shown that feeding dairy cows diets containing a high proportion (>40%) of wheat may result in reduced milk fat concentration and reduced CH4 emissions (g of CH4/cow per d), but no long-term studies have been done on these responses. This study compared the milk production and CH4 responses when 24 dairy cows were fed diets containing high proportions of either wheat or corn over 16 wk. Cows were assigned to 2 groups and offered a diet (CRN) containing 10.0 kg of dry matter/d of crushed corn grain, 1.8 kg of dry matter/d of canola meal, 0.2 kg of dry matter/d of minerals, and 11.0 kg of dry matter/d of chopped alfalfa hay or a similar diet (WHT) in which wheat replaced the corn. Dry matter intake and milk yields of individual cows were measured daily. Methane emissions from individual cows were measured using controlled climate respiration chambers over 2 consecutive days during each of wk 4, 10, and 16. Milk composition was measured on the 2 d when cows were in chambers during wk 4, 10, and 16. Over the 16-wk experimental period, total dry matter intake remained relatively constant and similar for the 2 dietary treatment groups. At wk 4, CH4 emission, CH4 yield (g of CH4/kg of dry matter intake), milk fat yield, and milk fat concentration were substantially less in cows fed the WHT diet compared with the same metrics in cows fed the CRN diet; but these differences were not apparent at wk 10 and 16. The responses over time in these metrics were not similar in all cows. In 4 cows fed the WHT diet, CH4 yield, milk fat concentration, and milk fat yield remained relatively constant from wk 4 to 16, whereas for 5 fed the WHT diet, their CH4 emissions, milk fat yields, and milk fat concentrations almost doubled between wk 4 and 16. In the short term (4 wk), the inclusion of approximately 45% wheat instead of corn in the diet of cows resulted in reductions of 39% in CH4 yield, 35% in milk fat concentration, and 40% in milk fat yield. However, these reductions did not persist to wk 10 or beyond. Our data indicate that cows do not all respond in the same way with some "adaptive" cows showing a marked increase in CH4 yield, milk fat concentration, and milk fat yield after wk 4, whereas in other "nonadaptive" cows, these metrics were persistently inhibited to 16 wk. This research shows that short-term studies on dietary interventions to mitigate enteric CH4 emissions may not always predict the long-term effects of such interventions.
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Affiliation(s)
- P J Moate
- Department of Economic Development, Jobs, Transport and Resources, Agriculture Research Victoria, Ellinbank, Victoria 3821, Australia.
| | - J L Jacobs
- Department of Economic Development, Jobs, Transport and Resources, Agriculture Research Victoria, Ellinbank, Victoria 3821, Australia
| | - M C Hannah
- Department of Economic Development, Jobs, Transport and Resources, Agriculture Research Victoria, Ellinbank, Victoria 3821, Australia
| | - G L Morris
- Department of Economic Development, Jobs, Transport and Resources, Agriculture Research Victoria, Ellinbank, Victoria 3821, Australia
| | - K A Beauchemin
- Agriculture and Agri-Food Canada, Lethbridge, Alberta, Canada T1J 4B1
| | - P S Alvarez Hess
- Faculty of Veterinary and Agricultural Science, The University of Melbourne, Parkville, Victoria 3052, Australia
| | - R J Eckard
- Faculty of Veterinary and Agricultural Science, The University of Melbourne, Parkville, Victoria 3052, Australia
| | - Z Liu
- Department of Economic Development, Jobs, Transport and Resources, Agriculture Research Victoria, 5 Ring Road, Bundoora, Victoria 3083, Australia
| | - S Rochfort
- Department of Economic Development, Jobs, Transport and Resources, Agriculture Research Victoria, 5 Ring Road, Bundoora, Victoria 3083, Australia; School of Applied Systems Biology, La Trobe University, Bundoora, Victoria 3083, Australia
| | - W J Wales
- Department of Economic Development, Jobs, Transport and Resources, Agriculture Research Victoria, Ellinbank, Victoria 3821, Australia
| | - S R O Williams
- Department of Economic Development, Jobs, Transport and Resources, Agriculture Research Victoria, Ellinbank, Victoria 3821, Australia
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15
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Ponnampalam EN, Hopkins DL, Giri K, Jacobs JL, Plozza T, Lewandowski P, Bekhit A. The use of oxidative stress biomarkers in live animals (in vivo) to predict meat quality deterioration postmortem (in vitro) caused by changes in muscle biochemical components. J Anim Sci 2017; 95:3012-3024. [PMID: 28727089 DOI: 10.2527/jas.2016.0887] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
This study was conducted to determine whether circulating concentrations of blood isoprostanes can be used as an effective biomarker in lambs to predict degradation of color and/or lipid stability in meat. Lambs ( = 84) were fed diets of either lucerne pasture, annual ryegrass pasture, a commercial feedlot pellet, or a combination of annual ryegrass and feedlot pellet for 8 wk, including a 2-wk adaptation period. Blood isoprostane concentration at wk 0, 4, 6 or 8 of feeding was determined. Blood isoprostane concentration for each animal was then correlated with muscle biochemical components that impact color and/or lipid oxidative status during retail display. This included lipid oxidation levels in muscle assessed by thiobarbituric acid reactive substances and meat redness determined by a HunterLab colorimetric spectrometer. Lambs that consumed the commercial feedlot pellet had a lower muscle vitamin E level (< 0.01) and a greater level of -6 PUFA ( < 0.001) compared with lambs finished on annual ryegrass or lucerne. Lipid oxidation levels were greatest for lambs finished on the feedlot ration, lowest in lambs finished on the ryegrass diet, and intermediate for lambs finished on lucerne and ryegrass-feedlot combination ( < 0.01). After 8 wk of feeding, blood isoprostane concentration was positively correlated with lipid oxidation of meat displayed for 72 h in simulated retail conditions ( < 0.01). There was a negative linear relationship between isoprostane concentration and muscle vitamin E concentration ( = 0.07), lipid oxidation and muscle vitamin E concentration ( < 0.01) but a positive linear relationship between isoprostane concentration and muscle -6 PUFA ( < 0.001) or lipid oxidation and muscle -6 PUFA concentration ( < 0.001). Blood isoprostane concentration and lipid oxidation in meat were influenced by muscle vitamin E and -6 PUFA but not by -3 PUFA. There was no significant relationship observed between blood isoprostane concentration at 0, 4, 6 or 8 wk feeding vs. overall meat color (redness of meat) at 0 and 72 h of display, stored under simulated retail conditions. The results indicate that circulating blood isoprostane concentration can be a useful tool to predict the oxidative status of postmortem meat. Future work will examine the impact of this relationship on meat flavor/aroma deterioration post farm.
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16
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Rossman DR, Rojas A, Jacobs JL, Mukankusi C, Kelly JD, Chilvers MI. Pathogenicity and Virulence of Soilborne Oomycetes on Phaseolus vulgaris. Plant Dis 2017; 101:1851-1859. [PMID: 30677317 DOI: 10.1094/pdis-02-17-0178-re] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Dry bean (Phaseolus vulgaris L.) is a globally important leguminous food crop. Yields can be reduced by high incidence of soilborne oomycetes that cause seedling disease. Breeders have attempted to develop Pythium root rot-resistant bean varieties; however, relationships between dry bean and most soilborne oomycete species remain uncharacterized. Oomycete species (n = 28), including Pythium spp. and Phytopythium spp., were tested in a growth chamber seedling assay at 20°C and an in vitro seed assay at 20°C and 26°C to evaluate their pathogenicity and virulence on 'Red Hawk' dark red kidney bean and 'Zorro' black bean. Root size or disease severity was significantly impacted by 14 oomycete species, though results varied by bean variety, temperature, and assay. Of these 14 pathogenic oomycete species, 11 species exhibited significant differences in DSI due to temperature on at least one bean variety. Pythium aphanidermatum, P. myriotylum, P. ultimum, P. ultimum var. sporangiiferium, and P. ultimum var. ultimum were the most virulent species in both assays, causing seed rot and pre-emergence damping-off of dry bean. Oomycete species were clustered into three groups based on symptom development: seed rot pathogens, root rot pathogens, or nonpathogens. Intraspecific variability in virulence was observed for eight of the 14 pathogenic oomycete species. Improved understanding of Pythium and Phytopythium interactions with dry bean may enable breeders and pathologists to more effectively evaluate strategies for oomycete seedling disease management.
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Affiliation(s)
- D R Rossman
- Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing
| | - A Rojas
- Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing
| | - J L Jacobs
- Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing
| | - C Mukankusi
- International Center for Tropical Agriculture, Kawanda Agricultural Research Institute, Kampala, Uganda
| | - J D Kelly
- Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing
| | - M I Chilvers
- Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing
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17
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Ponnampalam EN, Plozza T, Kerr MG, Linden N, Mitchell M, Bekhit AEDA, Jacobs JL, Hopkins DL. Interaction of diet and long ageing period on lipid oxidation and colour stability of lamb meat. Meat Sci 2017; 129:43-49. [PMID: 28249178 DOI: 10.1016/j.meatsci.2017.02.008] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2016] [Revised: 01/30/2017] [Accepted: 02/09/2017] [Indexed: 11/24/2022]
Abstract
Eighty-four crossbred wether and ewe lambs were allocated to four finishing diets. The diets were: Lucerne pasture (n=24), Annual ryegrass with sub clover pasture (n=18), Standard commercial feedlot pellets (n=24) and Annual ryegrass based pasture and commercial feedlot pellets (500g/day/head) (n=18). After 8weeks of feeding the lambs were slaughtered and the m. longissimus (LL) and m. semimembranosus (SM) were vacuum packaged and held chilled for 5 (fresh) or 60 (long aged) days, after which samples of each were displayed for 4days under simulated retail conditions. Irrespective of muscle type the long aged samples exhibited a rapid reduction in redness (a*-values) and R630/580nm ratio values such that consumer acceptable thresholds for both traits were quickly exceeded providing limited shelf life. Long ageing also lead to high TBARS levels measured as MDA mg/kg muscle suggestive of a product likely to exhibit rancidity and off flavours from lipid oxidation.
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Affiliation(s)
- Eric N Ponnampalam
- Agriculture Research, Agriculture Victoria, Department of Economic Development, Jobs, Transport and Resources, Melbourne, Victoria 3001, Australia.
| | - Tim Plozza
- Agriculture Research, Agriculture Victoria, Department of Economic Development, Jobs, Transport and Resources, Melbourne, Victoria 3001, Australia
| | - Matthew G Kerr
- Agriculture Research, Agriculture Victoria, Department of Economic Development, Jobs, Transport and Resources, Melbourne, Victoria 3001, Australia
| | - Nick Linden
- Agriculture Research, Agriculture Victoria, Department of Economic Development, Jobs, Transport and Resources, Melbourne, Victoria 3001, Australia
| | - Meredith Mitchell
- Agriculture Research, Agriculture Victoria, Department of Economic Development, Jobs, Transport and Resources, Melbourne, Victoria 3001, Australia
| | - Alaa El-Din A Bekhit
- Department of Food Science, University of Otago, PO Box 56, Dunedin, New Zealand
| | - Joe L Jacobs
- Agriculture Research, Agriculture Victoria, Department of Economic Development, Jobs, Transport and Resources, Melbourne, Victoria 3001, Australia
| | - David L Hopkins
- NSW Department of Primary Industries, Centre for Red Meat and Sheep Development, PO Box 129, Cowra NSW 2794, Australia
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18
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Hixson JL, Jacobs JL, Wilkes EN, Smith PA. Survey of the Variation in Grape Marc Condensed Tannin Composition and Concentration and Analysis of Key Compositional Factors. J Agric Food Chem 2016; 64:7076-7086. [PMID: 27615673 DOI: 10.1021/acs.jafc.6b03126] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Grape marc contains a number of compounds with potential antimethanogenic activity in ruminants, including condensed tannins (CTs). Using direct phloroglucinolysis, a survey of CT chemistry across 66 grape marc samples showed diversity in concentration (6.9 to 138.8 g/kg of dry matter). Concentration was found to be independent of CT composition, although all compositional variables were significantly correlated (P < 0.0001). Twenty samples diverse in CT were selected from a cluster analysis and analyzed for compounds relevant to ruminant digestion and methanogenesis, including metabolizable energy (6.6-12.0 MJ/kg DM), crude protein (3.2-14.4% DM), neutral detergent fiber (18.4-61.4% DM), and ethanol soluble carbohydrates (2.0-40.6% DM). Fatty acid concentrations varied throughout the 20 samples (5.2-184.5 g/kg DM), although fatty acid profile showed two distinct groups. Grape marc varies widely in nutritional value, and in compounds that have been linked with changes in ruminant digestion and methane emissions.
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Affiliation(s)
- Josh L Hixson
- The Australian Wine Research Institute , P.O. Box 197, Glen Osmond, Adelaide 5064, Australia
| | - Joe L Jacobs
- Department of Economic Development, Jobs, Transport, and Resources , 1301 Hazeldean Road, Ellinbank, Victoria 3821, Australia
| | - Eric N Wilkes
- The Australian Wine Research Institute , P.O. Box 197, Glen Osmond, Adelaide 5064, Australia
| | - Paul A Smith
- The Australian Wine Research Institute , P.O. Box 197, Glen Osmond, Adelaide 5064, Australia
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19
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Moate PJ, Deighton MH, Williams SRO, Pryce JE, Hayes BJ, Jacobs JL, Eckard RJ, Hannah MC, Wales WJ. Reducing the carbon footprint of Australian milk production by mitigation of enteric methane emissions. Anim Prod Sci 2016. [DOI: 10.1071/an15222] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
This review examines research aimed at reducing enteric methane emissions from the Australian dairy industry. Calorimeter measurements of 220 forage-fed cows indicate an average methane yield of 21.1 g methane (CH4)/kg dry matter intake. Adoption of this empirical methane yield, rather than the equation currently used in the Australian greenhouse gas inventory, would reduce the methane emissions attributed to the Australian dairy industry by ~10%. Research also indicates that dietary lipid supplements and feeding high amounts of wheat substantially reduce methane emissions. It is estimated that, in 1980, the Australian dairy industry produced ~185 000 t of enteric methane and total enteric methane intensity was ~33.6 g CH4/kg milk. In 2010, the estimated production of enteric methane was 182 000 t, but total enteric methane intensity had declined ~40% to 19.9 g CH4/kg milk. This remarkable decline in methane intensity and the resultant improvement in the carbon footprint of Australian milk production was mainly achieved by increased per-cow milk yield, brought about by the on-farm adoption of research findings related to the feeding and breeding of dairy cows. Options currently available to further reduce the carbon footprint of Australian milk production include the feeding of lipid-rich supplements such as cottonseed, brewers grains, cold-pressed canola, hominy meal and grape marc, as well as feeding of higher rates of wheat. Future technologies for further reducing methane emissions include genetic selection of cows for improved feed conversion to milk or low methane intensity, vaccines to reduce ruminal methanogens and chemical inhibitors of methanogenesis.
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Muir SK, Ward GN, Jacobs JL. Herbage intake and milk production of late-lactation dairy cows offered a second-year chicory crop during summer. J Dairy Sci 2015; 98:8825-35. [PMID: 26409973 DOI: 10.3168/jds.2014-9147] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2014] [Accepted: 08/03/2015] [Indexed: 12/16/2023]
Abstract
Chicory (Cichorum intybus L.) is a summer-active forage herb which has been proposed as an option to increase summer feed supply, increase dry matter intake, nutrient intake, and milk yield from nonirrigated dairy production systems in southern Australia. Dry matter intake, nutrient intake, milk yield, and yield of milk fat and protein of predominantly Holstein-Friesian dairy cows in late lactation consuming 3 herbage-based diets (4 replicates per treatment) were measured. The 3 grazed herbages were second-year chicory (CHIC) and perennial ryegrass (Lolium perenne L.; PRG) monocultures and a mixed sward (~50:50) of chicory and perennial ryegrass (MIX). All diets (CHIC, PRG, and MIX) were supplemented with alfalfa (Medicago sativa L.) hay (5.5kg of DM/cow per day) and an energy-based concentrate pellet (4.0kg of DM/cow per day). There were no significant differences in milk yield (12.0 to 12.6kg/d across the treatments) or the yield of milk fat (539 to 585g/d) and milk protein (433 to 447g/d) between the 3 herbage-based diets. No differences in DMI (17.9 to 19.2kg/d) or estimated metabolizable energy intake (173 to 185MJ/d) were noted between treatments. Estimated metabolizable energy concentrations in the forages on offer were lower in CHIC than PRG (7.6 vs. 8.2MJ/kg of dry matter), but the concentration in consumed herbage was not different (9.1 vs. 9.2MJ/kg of dry matter); as such, potential for increased milk yield in cows offered CHIC was limited. Increased concentration of polyunsaturated fatty acids was observed in chicory herbage compared with perennial ryegrass. This was associated with increased milk conjugated linoleic acid and milk polyunsaturated fatty acids when chicory formed part of the diet (CHIC compared to PRG and MIX). Chicory could be used as an alternative to perennial ryegrass in summer; however, the developmental stage of chicory will influence concentrations of metabolizable energy and neutral detergent fiber and, therefore, intake and milk production responses compared with perennial ryegrass.
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Affiliation(s)
- S K Muir
- Department of Economic Development, Jobs, Transport and Resources, Warrnambool, Vic 3280, Australia.
| | - G N Ward
- Department of Economic Development, Jobs, Transport and Resources, Warrnambool, Vic 3280, Australia
| | - J L Jacobs
- Department of Economic Development, Jobs, Transport and Resources, Warrnambool, Vic 3280, Australia
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Auldist MJ, Marett LC, Greenwood JS, Wright MM, Hannah M, Jacobs JL, Wales WJ. Milk production responses to different strategies for feeding supplements to grazing dairy cows. J Dairy Sci 2015; 99:657-71. [PMID: 26585473 DOI: 10.3168/jds.2015-9834] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2015] [Accepted: 09/17/2015] [Indexed: 11/19/2022]
Abstract
Milk production responses of grazing cows offered supplements in different ways were measured. Holstein-Friesian cows, averaging 45 d in milk, were allocated into 8 groups of 24, with 2 groups randomly assigned to each of 4 feeding strategies. These were control: cows grazed a restricted allowance of perennial ryegrass pasture supplemented with milled wheat grain fed in the milking parlor and alfalfa hay offered in the paddock; FGM: same pasture and allowance as the control supplemented with a formulated grain mix containing wheat grain, corn grain, and canola meal fed in the parlor and alfalfa hay fed in the paddock; PMRL: same pasture and allowance as the control, supplemented with a PMR consisting of the same FGM but mixed with alfalfa hay and presented on a feed pad after each milking; and PMRH: same PMR fed in the same way as PMRL but with a higher pasture allowance. For all strategies, supplements provided the same metabolizable energy and grain:forage ratio [75:25, dry matter (DM) basis]. Each group of 24 cows was further allocated into 4 groups of 6, which were randomly assigned to receive 8, 12, 14, or 16 kg of DM supplement/cow per d. Thus, 2 replicated groups per supplement amount per dietary strategy were used. The experiment had a 14-d adaptation period and a 14-d measurement period. Pasture allowance, measured to ground level, was approximately 14 kg of DM/d for control, FGM, and PMRL cows, and 28 kg of DM/d for the PMRH cows, and was offered in addition to the supplement. Positive linear responses to increasing amounts of supplement were observed for yield of milk, energy-corrected milk, fat, and protein for cows on all 4 supplement feeding strategies. Production of energy-corrected milk was greatest for PMRH cows, intermediate for FGM and PMRL cows, and lowest for control cows. Some of these differences in milk production related to differences in intake of pasture and supplement. Milk fat concentration decreased with increasing amount of supplement for all feeding strategies, but the decline was most marked for the control cows. Milk protein concentration increased for all groups as the amount of supplement increased, but was greater for FGM, PMRL, and PMRH cows than control cows. It is concluded that when supplements are fed to grazing dairy cows, inclusion of corn grain and canola meal can increase milk production even at similar metabolizable energy intakes, and that it does not matter whether these supplements are fed as a PMR or in the parlor and paddock.
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Affiliation(s)
- M J Auldist
- Agriculture Research Division, Department of Economic Development, Jobs, Transport and Resources, Ellinbank VIC 3821, Australia.
| | - L C Marett
- Agriculture Research Division, Department of Economic Development, Jobs, Transport and Resources, Ellinbank VIC 3821, Australia
| | - J S Greenwood
- Agriculture Research Division, Department of Economic Development, Jobs, Transport and Resources, Ellinbank VIC 3821, Australia
| | - M M Wright
- Agriculture Research Division, Department of Economic Development, Jobs, Transport and Resources, Ellinbank VIC 3821, Australia
| | - M Hannah
- Agriculture Research Division, Department of Economic Development, Jobs, Transport and Resources, Ellinbank VIC 3821, Australia
| | - J L Jacobs
- Agriculture Research Division, Department of Economic Development, Jobs, Transport and Resources, Ellinbank VIC 3821, Australia
| | - W J Wales
- Agriculture Research Division, Department of Economic Development, Jobs, Transport and Resources, Ellinbank VIC 3821, Australia
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Ponnampalam EN, Lewandowski PA, Fahri FT, Burnett VF, Dunshea FR, Plozza T, Jacobs JL. Forms of n-3 (ALA, C18:3n-3 or DHA, C22:6n-3) Fatty Acids Affect Carcass Yield, Blood Lipids, Muscle n-3 Fatty Acids and Liver Gene Expression in Lambs. Lipids 2015; 50:1133-43. [PMID: 26395388 DOI: 10.1007/s11745-015-4070-4] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2015] [Accepted: 08/28/2015] [Indexed: 10/23/2022]
Abstract
The effects of supplementing diets with n-3 alpha-linolenic acid (ALA) and docosahexaenoic acid (DHA) on plasma metabolites, carcass yield, muscle n-3 fatty acids and liver messenger RNA (mRNA) in lambs were investigated. Lambs (n = 120) were stratified to 12 groups based on body weight (35 ± 3.1 kg), and within groups randomly allocated to four dietary treatments: basal diet (BAS), BAS with 10.7 % flaxseed supplement (Flax), BAS with 1.8 % algae supplement (DHA), BAS with Flax and DHA (FlaxDHA). Lambs were fed for 56 days. Blood samples were collected on day 0 and day 56, and plasma analysed for insulin and lipids. Lambs were slaughtered, and carcass traits measured. At 30 min and 24 h, liver and muscle samples, respectively, were collected for determination of mRNA (FADS1, FADS2, CPT1A, ACOX1) and fatty acid composition. Lambs fed Flax had higher plasma triacylglycerol, body weight, body fat and carcass yield compared with the BAS group (P < 0.001). DHA supplementation increased carcass yield and muscle DHA while lowering plasma insulin compared with the BAS diet (P < 0.01). Flax treatment increased (P < 0.001) muscle ALA concentration, while DHA treatment increased (P < 0.001) muscle DHA concentration. Liver mRNA FADS2 was higher and CPT1A lower in the DHA group (P < 0.05). The FlaxDHA diet had additive effects, including higher FADS1 and ACOX1 mRNA than for the Flax or DHA diet. In summary, supplementation with ALA or DHA modulated plasma metabolites, muscle DHA, body fat and liver gene expression differently.
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Affiliation(s)
- Eric N Ponnampalam
- Agriculture Research and Development, DEDJTR, Melbourne, VIC, 3001, Australia. .,Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, VIC, 3010, Australia.
| | - Paul A Lewandowski
- School of Medicine and Centre for Molecular and Medical Research, Deakin University, Waurn Ponds, VIC, 3216, Australia
| | - Fahri T Fahri
- Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, VIC, 3010, Australia
| | - Viv F Burnett
- Agriculture Research and Development, DEDJTR, Melbourne, VIC, 3001, Australia
| | - Frank R Dunshea
- Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, VIC, 3010, Australia
| | - Tim Plozza
- Agriculture Research and Development, DEDJTR, Melbourne, VIC, 3001, Australia
| | - Joe L Jacobs
- Agriculture Research and Development, DEDJTR, Melbourne, VIC, 3001, Australia.,Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, VIC, 3010, Australia
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23
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Pembleton KG, Tozer KN, Edwards GR, Jacobs JL, Turner LR. Simple versus diverse pastures: opportunities and challenges in dairy systems. Anim Prod Sci 2015. [DOI: 10.1071/an14816] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
For Australian and New Zealand dairy farms, the primary source of home-grown feed comes from grazed perennial pastures. The high utilisation of perennial pasture is a key factor in the low cost of production of Australian and New Zealand dairy systems and, hence, in their ability to maintain international competiveness. The major pasture species used are perennial ryegrass (Lolium perenne L.) and white clover (Trifolium repens L.), normally grown in a simple binary mixture. As pasture production has been further driven by increasing use of nitrogen fertiliser and irrigation, farms are getting closer to their economic optimum level of pasture utilisation. Increasing inputs and intensification have also increased scrutiny on the environmental footprint of dairy production. Increasing the diversity of pasture species within dairy swards presents opportunities to further increase pasture utilisation through additional forage production, extending the growing season, improving forage nutritive characteristics and, ultimately, increasing milk production per cow and/or per hectare. Diverse pastures also present an opportunity to mitigate some of the environmental consequences associated with intensive pasture-based dairy systems. A consistent finding of experiments investigating diverse pastures is that their benefits are due to the attributes of the additional species, rather than increasing the number of species per se. Therefore, the species that are best suited for inclusion into dairy pastures will be situation specific. Furthermore, the presence of additional species will generally require modification to the management of dairy pastures, particularly around nitrogen fertiliser and grazing, to ensure that the additional species remain productive and persistent.
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Mollov D, Chilvers MI, Jacobs JL. First Report of Aster Yellows Phytoplasma in Soybean in Michigan. Plant Dis 2014; 98:1578. [PMID: 30699807 DOI: 10.1094/pdis-05-14-0451-pdn] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
During the summer of 2012, soybean plants in a commercial field in Clinton County, Michigan, exhibited symptoms characteristic of phytoplasmal diseases (1,2). Symptoms included extensive top dieback, stunting, purple stem surfaces, internal necrosis, leaf vein discoloration, and bud proliferation. Approximately 80% of plants in a half hectare along the southern edge of the field were symptomatic, although the majority of plants in the 4-ha field appeared symptomless. Total genomic DNA was extracted from one symptomatic and one asymptomatic leaf sample using a Qiagen DNeasy Plant Mini Kit (Qiagen, Germantown, MD) according to manufacturer's instructions. The DNA was used as template in direct PCR primed by the phytoplasma-universal primers P1/P7 followed by nested PCR primed by P1/AYint (3). Reactions containing template DNA from the symptomatic plant yielded ribosomal RNA gene amplicons of 1.8 kbp (P1/P7-primed) and 1.6 kbp (P1/AYint-primed), respectively. Reactions containing template DNA from the asymptomatic plant or water did not yield amplicons. The products of PCRs primed by P1/P7 were purified using PureLink PCR Purification kit (Life Technologies, Carlsbad, CA) and cloned in a pGem T-Easy vector system (Promega, Madison, WI). Three separate clones were sequenced using the sequencing primers M13For, M13Rev, SAYF nt 755, (5'-AAAGCGTGGGGAGCAAACAG), and SAYR nt 1159, (5'-TTTGACGTCGTCCCCACCTT). The sequences of all three clones were identical. A consensus (Sequencher 4.1, Gene Codes Corporation, Ann Arbor, MI) nucleotide sequence of 1,830 bp was deposited in GenBank under the accession number KF528320. A BLASTn similarity search revealed that the sequence shared 100% identity to rDNA of aster yellows phytoplasma (AF222063). Additionally, analysis of the 16Sr group/subgroup classification, based on in silico RFLP analyses using iPhyClassifier (4), indicated that the soybean phytoplasma is a member of subgroup 16SrI-B aster yellows phytoplasma subgroup. In a phylogenic tree deduced using the neighbor joining algorithm, the phytoplasma consensus sequence obtained from soybean in Michigan clustered with other group 16SrI (aster yellows phytoplasma) strains. While aster yellows phytoplasma has been previously reported in soybean in Wisconsin (2), to our knowledge, this is the first report of aster yellows in soybean in Michigan. References: (1) C. R. Grau et al. Compendium of Soybean Diseases, 4th ed. G. L. Hartman et al., eds. American Phytopathological Society, St. Paul, MN, 1999. (2) M. E. Lee et al. Can. J. Plant Pathol. 24:125, 2002. (3) C. D. Smart et al. Appl. Env. Microbiol. 62:2988, 1996. (4) Y. Zhao et al. Int. J. Syst. Evol. Microbiol. 59:2582, 2009.
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Affiliation(s)
| | - M I Chilvers
- Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing 48824
| | - J L Jacobs
- Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing 48824
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25
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Moate PJ, Williams SRO, Torok VA, Hannah MC, Ribaux BE, Tavendale MH, Eckard RJ, Jacobs JL, Auldist MJ, Wales WJ. Grape marc reduces methane emissions when fed to dairy cows. J Dairy Sci 2014; 97:5073-87. [PMID: 24952778 DOI: 10.3168/jds.2013-7588] [Citation(s) in RCA: 101] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2013] [Accepted: 05/05/2014] [Indexed: 11/19/2022]
Abstract
Grape marc (the skins, seeds, stalk, and stems remaining after grapes have been pressed to make wine) is currently a by-product used as a feed supplement by the dairy and beef industries. Grape marc contains condensed tannins and has high concentrations of crude fat; both these substances can reduce enteric methane (CH4) production when fed to ruminants. This experiment examined the effects of dietary supplementation with either dried, pelleted grape marc or ensiled grape marc on yield and composition of milk, enteric CH4 emissions, and ruminal microbiota in dairy cows. Thirty-two Holstein dairy cows in late lactation were offered 1 of 3 diets: a control (CON) diet; a diet containing dried, pelleted grape marc (DGM); and a diet containing ensiled grape marc (EGM). The diet offered to cows in the CON group contained 14.0kg of alfalfa hay dry matter (DM)/d and 4.3kg of concentrate mix DM/d. Diets offered to cows in the DGM and EGM groups contained 9.0kg of alfalfa hay DM/d, 4.3kg of concentrate mix DM/d, and 5.0kg of dried or ensiled grape marc DM/d, respectively. These diets were offered individually to cows for 18d. Individual cow feed intake and milk yield were measured daily and milk composition measured on 4d/wk. Individual cow CH4 emissions were measured by the SF6 tracer technique on 2d at the end of the experiment. Ruminal bacterial, archaeal, fungal, and protozoan communities were quantified on the last day of the experiment. Cows offered the CON, DGM, and EGM diets, ate 95, 98, and 96%, respectively, of the DM offered. The mean milk yield of cows fed the EGM diet was 12.8kg/cow per day and was less than that of cows fed either the CON diet (14.6kg/cow per day) or the DGM diet (15.4kg/cow per day). Feeding DGM and EGM diets was associated with decreased milk fat yields, lower concentrations of saturated fatty acids, and enhanced concentrations of mono- and polyunsaturated fatty acids, in particular cis-9,trans-11 linoleic acid. The mean CH4 emissions were 470, 375, and 389g of CH4/cow per day for cows fed the CON, DGM, and EGM diets, respectively. Methane yields were 26.1, 20.2, and 21.5g of CH4/kg of DMI for cows fed the CON, DGM, and EGM diets, respectively. The ruminal bacterial and archaeal communities were altered by dietary supplementation with grape marc, but ruminal fungal and protozoan communities were not. Decreases of approximately 20% in CH4 emissions and CH4 yield indicate that feeding DGM and EGM could play a role in CH4 abatement.
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Affiliation(s)
- P J Moate
- Future Farming Systems Research Division, Department of Environment and Primary Industries, Ellinbank, Victoria 3821, Australia.
| | - S R O Williams
- Future Farming Systems Research Division, Department of Environment and Primary Industries, Ellinbank, Victoria 3821, Australia
| | - V A Torok
- South Australian Research and Development Institute, Soil Biology and Diagnostics, Waite Campus, Urrbrae, South Australia, 5064, Australia
| | - M C Hannah
- Future Farming Systems Research Division, Department of Environment and Primary Industries, Ellinbank, Victoria 3821, Australia
| | - B E Ribaux
- Future Farming Systems Research Division, Department of Environment and Primary Industries, Ellinbank, Victoria 3821, Australia
| | | | - R J Eckard
- Melbourne School of Land and Environment, The University of Melbourne, Victoria 3010, Australia
| | - J L Jacobs
- Future Farming Systems Research Division, Department of Environment and Primary Industries, Warrnambool, Victoria 3280, Australia
| | - M J Auldist
- Future Farming Systems Research Division, Department of Environment and Primary Industries, Ellinbank, Victoria 3821, Australia
| | - W J Wales
- Future Farming Systems Research Division, Department of Environment and Primary Industries, Ellinbank, Victoria 3821, Australia
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26
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Jesche A, McCallum RW, Thimmaiah S, Jacobs JL, Taufour V, Kreyssig A, Houk RS, Bud'ko SL, Canfield PC. Giant magnetic anisotropy and tunnelling of the magnetization in Li₂(Li(1-x)Fe(x))N. Nat Commun 2014; 5:3333. [PMID: 24566374 DOI: 10.1038/ncomms4333] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2013] [Accepted: 01/28/2014] [Indexed: 11/09/2022] Open
Abstract
Large magnetic anisotropy and coercivity are key properties of functional magnetic materials and are generally associated with rare earth elements. Here we show an extreme, uniaxial magnetic anisotropy and the emergence of magnetic hysteresis in Li₂(Li(1-x)Fe(x))N. An extrapolated, magnetic anisotropy field of 220 T and a coercivity field of over 11 T at 2 K outperform all known hard ferromagnets and single-molecular magnets. Steps in the hysteresis loops and relaxation phenomena in striking similarity to single-molecular magnets are particularly pronounced for x≪1 and indicate the presence of nanoscale magnetic centres. Quantum tunnelling, in the form of temperature-independent relaxation and coercivity, deviation from Arrhenius behaviour and blocking of the relaxation, dominates the magnetic properties up to 10 K. The simple crystal structure, the availability of large single crystals and the ability to vary the Fe concentration make Li₂(Li(1-x)Fe(x))N an ideal model system to study macroscopic quantum effects at elevated temperatures and also a basis for novel functional magnetic materials.
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Affiliation(s)
- A Jesche
- The Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA
| | - R W McCallum
- 1] The Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA [2] Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011, USA
| | - S Thimmaiah
- The Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA
| | - J L Jacobs
- 1] The Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA [2] Department of Chemistry, Iowa State University, Ames, Iowa 50011, USA
| | - V Taufour
- Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
| | - A Kreyssig
- 1] The Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA [2] Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
| | - R S Houk
- 1] The Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA [2] Department of Chemistry, Iowa State University, Ames, Iowa 50011, USA
| | - S L Bud'ko
- 1] The Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA [2] Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
| | - P C Canfield
- 1] The Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA [2] Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
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Muir SK, Ward GN, Jacobs JL. Milk production and composition of mid-lactation cows consuming perennial ryegrass-and chicory-based diets. J Dairy Sci 2014; 97:1005-15. [PMID: 24290818 DOI: 10.3168/jds.2013-7183] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2013] [Accepted: 10/22/2013] [Indexed: 11/19/2022]
Abstract
Dry matter intakes (DMI), nutrient selection, and milk production responses of dairy cows grazing 3 herbage-based diets offered at 2 allowances were measured. The 2 allowances were 20 (low) and 30 (high) kg of dry matter (DM)/cow per day and these were applied to 3 herbage types: perennial ryegrass (PRG) and chicory (CHIC+) monocultures and a mixed sward of chicory and perennial ryegrass (MIX). The CHIC+ diet was supplemented with alfalfa hay (approximately 2 kg of DM/cow per day) to maintain dietary neutral detergent fiber (NDF) concentration and all diets were supplemented with energy-based pellets (6 kg of DM/cow per day). Holstein-Friesian dairy cows averaging 136 ± 30 d in milk were allocated to 4 replicates of the 6 treatments using stratified randomization procedures. Cows were adapted to their experimental diets over a 14-d period, with measurements of DMI, milk yield, and composition conducted over the following 10 d. Herbage DMI was lowest (12.8 vs. 14.0 kg of DM/d) for CHIC+ compared with the MIX and PRG, although total forage intake (grazed herbage plus hay) was similar (14.0 to 15.0 kg of DM/d) across the 3 treatments. Milk production, milk protein, and milk fat concentrations were not different between herbage types. Grazed herbage DMI increased with increasing herbage allowance and this was associated with increased milk protein concentration (3.23 to 3.34%) and total casein production (41.7 to 43.6 mg/g). Concentrations of polyunsaturated fatty acids in milk fat, particularly linoleic acid, were increased in milk from cows offered the CHIC+ or the MIX diets, indicating potential benefits of chicory herbage on milk fatty acid concentrations. Although feeding CHIC+ or MIX did not increase milk yield, these herbage types could be used as an alternative to perennial ryegrass pasture in spring.
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Affiliation(s)
- S K Muir
- Department of Environment and Primary Industries, 78 Henna Street, Warrnambool, Victoria 3280, Australia.
| | - G N Ward
- Department of Environment and Primary Industries, 78 Henna Street, Warrnambool, Victoria 3280, Australia
| | - J L Jacobs
- Department of Environment and Primary Industries, 78 Henna Street, Warrnambool, Victoria 3280, Australia
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Oriot P, Selvais P, Radikov J, Jacobs JL, Gilleman U, Loumaye R, Fernandez C. Assessing the incidence of gestational diabetes and neonatal outcomes using the IADPSG guidelines in comparison with the Carpenter and Coustan criteria in a Belgian general hospital. Acta Clin Belg 2014; 69:8-11. [PMID: 24635392 DOI: 10.1179/0001551213z.0000000004] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
We have conducted a systematic universal screening for gestational diabetes mellitus (GDM) since 2008, following the criteria outlined by the International Association of Diabetes and Pregnancy Study Group (IADPSG) since 2011. However, we recently replaced the IADPSG standards with those established by the Belgian French Language Gynecologists and Obstetricians Group (GGOLFB). These new criteria indicate GDM when fasting plasma glucose (FPG) is ≥0·92 g/l at the beginning of pregnancy or when an orally provoked hyperglycaemia test (75 g of glucose) between the twenty-fourth and twenty-eighth week results in an FPG of ≥0·92 g/l and/or ≥1·80 g/l after 1 hour and/or ≥1·53 g/l after 2 hours. The goal of this retrospective study was to evaluate the incidence of GDM, neonatal outcomes, and the use of insulin therapy 21 months post-implementation of the IADPSG criteria within our centre. A total of 393 patients were diagnosed with GDM from January 2009 to December 2012. After applying the new criteria, the incidence of GDM rose significantly from 8 to 23% (P<0·0001). However, there were no significant changes in the proportion of GDM patients requiring insulin therapy (34·2% versus 34·7%) or the rate of foetal large for gestational age (11·2% versus 8·8%). In addition, the ≥90% percentile decreased non-significantly from 96·3±0·6% to 94·3±0·70% (P = 0·057), whereas the lower quartiles and the proportion of cesarean deliveries (27·0% versus 25·6%) did not change significantly. Therefore, non-targeted screening significantly increased the incidence of GDM in our centre without significantly decreasing large for gestational age or the number of cesarean deliveries.
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Abstract
Soybean vein necrosis virus (SVNV) is associated with an emerging disease in soybean producing regions of the United States. Soybean leaves with necrotic vein symptoms were initially noted in 2008 or 2009 in fields across Arkansas, Kansas, Missouri, Illinois, Mississippi, Tennessee, and Kentucky and SVNV was determined to be the causal agent (2). In 2012, widespread reports of SVNV were made across most soybean (Glycine max) producing states including the recent confirmation of SVNV in Iowa and Wisconsin (1). Foliar symptoms similar to those reported for SVNV were observed at approximately 1 to 10% incidence in soybean fields across Michigan in late August and September of 2012, including fields located in Cass, Ingham, Midland, Saginaw, and Van Buren counties. Symptoms included chlorosis and necrosis which initiated on the veins with subsequent spread across the leaf. An initial sample collected from the East Lansing Agricultural Research Station was confirmed to have SVNV with a polyclonal antibody using double antibody sandwich (DAS)-ELISA at AC Diagnostics, Inc. (Fayetteville, AR) and with reverse transcription PCR by Ioannis Tzanetakis, University of Arkansas, Fayetteville. Additional samples from five fields were subsequently collected from Cass, Ingham, and Van Buren counties. Duplicate leaf tissue samples were tested with DAS-ELISA using the SVNV test kit (AC Diagnostics). All symptomatic leaf samples exhibited a strong positive reaction based on the optical density reading at 405 nm. Absorbance reading that exceeded the healthy soybean tissue by a standard deviation of +3× were considered positive. Total RNA was also extracted from each sample using the RNeasy Plant Mini Kit (Qiagen, Germantown, MD). Complementary DNA (cDNA) was generated using virus-specific LdetR and SdetR primers (2) with the High Capacity RT cDNA kit (Life Technologies; Carlsbad, CA). The cDNA was used as template for PCR with the SVNV-specific primers that amplify regions of the L (LdetF/LdetR) and the S (SdetF/SdetR) RNAs (1). Amplification products of the expected 297 and 861 bp size, respectively, were detected in all symptomatic samples while no amplification products were generated from healthy soybean plant tissues grown under greenhouse conditions. Significantly, this is the first documentation and confirmation of the widespread prevalence of SVNV across the state of Michigan in 2012. References: (1) D. L. Smith et al. Plant Dis. http://dx.doi.org/10.1094/PDIS-11-12-1096-PDN . (2) J. Zhou et al. Virus Genes 43:289, 2011.
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Affiliation(s)
- J L Jacobs
- Department of Plant, Soil, and Microbial Sciences, Michigan State University, East Lansing, 48824
| | - M I Chilvers
- Department of Plant, Soil, and Microbial Sciences, Michigan State University, East Lansing, 48824
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Moate PJ, Williams SRO, Hannah MC, Eckard RJ, Auldist MJ, Ribaux BE, Jacobs JL, Wales WJ. Effects of feeding algal meal high in docosahexaenoic acid on feed intake, milk production, and methane emissions in dairy cows. J Dairy Sci 2013; 96:3177-88. [PMID: 23498011 DOI: 10.3168/jds.2012-6168] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2012] [Accepted: 01/21/2013] [Indexed: 11/19/2022]
Abstract
This study examined effects on milk yield and composition, milk fatty acid concentrations and methane (CH4) emissions when dairy cows were offered diets containing different amounts of algal meal. The algal meal contained 20% docosahexaenoic acid (DHA) and cows were offered either 0, 125, 250, or 375 g/cow per d of algal meal corresponding to 0, 25, 50, or 75 g of DHA/cow per d. Thirty-two Holstein cows in mid lactation were allocated to 4 treatment groups, and cows in all groups were individually offered 5.9k g of dry matter (DM) per day of concentrates [683 g/kg of cracked wheat (Triticum aestivum), 250 g/kg of cold-pressed canola, 46 g/kg of granulated dried molasses, and 21 g/kg of mineral mix] and ad libitum alfalfa (Medicago sativa) hay. The algal meal supplement was added to the concentrate allowance and was fed during the morning and afternoon milking, whereas the alfalfa hay was fed individually in pens. Cows were gradually introduced to their diets over 7d and then fed their treatment diets for a further 16d. Dry matter intake and milk yield were measured daily, and milk composition was measured on a sample representative of the daily milk yield on Thursday of each week. For the last 2d of the experiment, cows were individually housed in respiration chambers to allow measurement of CH4 emissions. Dry matter intake, milk yield and milk composition were also measured while cows were in the respiration chambers. Cows ate all their offered concentrates, but measured intake of alfalfa decreased with increasing dose of DHA by 16.2, 16.4, 15.1, and 14.3 kg of DM/d, respectively. Milk yield (22.6, 23.5, 22.6, and 22.6 kg/cow per d) was not affected by DHA dose, but milk fat concentrations (49.7, 37.8, 37.0, and 38.3g/kg) and, consequently, milk fat yields (1.08, 0.90, 0.83, and 0.85 kg/d) decreased with addition of DHA. The feeding of algal meal high in DHA was associated with substantial increases in the concentrations of DHA (0.04, 0.36, 0.60, and 0.91 g/100g of milk fatty acids) and conjugated linoleic acid C18:2 cis-9,trans-11 (0.36, 1.09, 1.79, and 1.87 g/100g of milk fatty acids). Addition of DHA did not affect total emissions of CH4 (543, 563, 553, and 520 g/cow per d), nor emissions in terms of milk production (24.9, 22.1, 24.3, and 23.4 g of CH4/kg of milk), but emissions were increased with respect to total intake (22.6, 23.5, 24.5, and 24.4 g of CH4/kg of DM). These findings indicate that CH4 emissions were not reduced when dairy cows were fed a forage-based diet supplemented with DHA from algal meal.
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Affiliation(s)
- P J Moate
- Future Farming Systems Research Division, Department of Primary Industries, Ellinbank, Victoria 3821, Australia.
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Ponnampalam EN, Butler KL, Burnett VF, McDonagh MB, Jacobs JL, Hopkins DL. Aged Vacuum Packaged Lamb Cuts Are Less Brown than Fresh Muscle Cuts under Simulated Retail Display. ACTA ACUST UNITED AC 2013. [DOI: 10.4236/fns.2013.48a018] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Auldist MJ, Marett LC, Greenwood JS, Hannah M, Jacobs JL, Wales WJ. Effects of different strategies for feeding supplements on milk production responses in cows grazing a restricted pasture allowance. J Dairy Sci 2012; 96:1218-31. [PMID: 23219117 DOI: 10.3168/jds.2012-6079] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2012] [Accepted: 10/19/2012] [Indexed: 11/19/2022]
Abstract
Milk production responses of grazing cows offered supplements in different ways were measured. Holstein-Friesian cows, averaging 227 d in milk, were allocated into 6 groups of 36, with 2 groups randomly assigned to each of 3 feeding strategies: (1) cows grazed perennial ryegrass pasture supplemented with milled barley grain fed in the milking parlor and pasture silage offered in the paddock (control); (2) same pasture and allotment supplemented with the same amounts of milled barley grain and pasture silage, but presented as a mixed ration after each milking (PMR 1); and (3) same pasture and allotment, supplemented with a mixed ration of milled barley grain, alfalfa hay, corn silage, and crushed corn grain (PMR 2). For all strategies, supplements provided the same metabolizable energy and grain:forage ratio. [75:25, dry matter (DM) basis]. Each group of 36 cows was further allocated into 4 groups of 9, which were assigned to receive 6, 8, 10, or 12 kg of supplement DM/cow per day. Thus, there were 2 replicated groups per supplement amount per dietary strategy. The experiment had a 14-d adaptation period and an 11-d measurement period. Pasture allotment was approximately 14 kg of DM/d for all cows and was offered in addition to the supplement. Positive quadratic responses to increasing amounts of supplement were observed for yield of milk, energy-corrected milk (ECM), and fat and protein, and positive linear responses for concentrations of fat and protein for cows on all 3 supplement feeding strategies. No difference existed between feeding strategy groups in yield of milk, ECM, or protein at any amount of supplement offered, but yield and concentration of fat was higher in PMR 2 cows compared with control and PMR 1 cows at the highest amounts of supplementation. Responses in marginal ECM production per additional kilogram of supplement were also greater for PMR 2 than control and PMR 1 cows when large amounts of supplement were consumed. For all diets, marked daily variation occurred in ruminal fluid volatile fatty acids and pH, especially in cows fed the largest amounts of supplement. It was concluded that when supplements are fed to grazing dairy cows, a simple mix of grain and pasture silage has no benefit over traditional strategies of feeding grain in the parlor and forage in the paddock. However, yield of milk fat and marginal milk production responses can be greater if the strategy uses an isoenergetic ration that also contains alfalfa hay, corn silage, and corn grain.
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Affiliation(s)
- M J Auldist
- Future Farming Systems Research Division, Department of Primary Industries, Ellinbank, VIC 3821, Australia.
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Yu C, Zhang X, Sun G, Guo X, Li H, You Y, Jacobs JL, Gardner K, Yuan D, Xu Z, Du Q, Dai C, Qian Z, Jiang K, Zhu Y, Li QQ, Miao Y. RNA interference-mediated silencing of the polo-like kinase 1 gene enhances chemosensitivity to gemcitabine in pancreatic adenocarcinoma cells. J Cell Mol Med 2008; 12:2334-49. [PMID: 18266952 PMCID: PMC4514112 DOI: 10.1111/j.1582-4934.2008.00257.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2007] [Accepted: 01/18/2008] [Indexed: 12/30/2022] Open
Abstract
Gemcitabine is the first-line chemotherapeutic agent for advanced adenocarcinoma of the pancreas; however, chemoresistance to gemcitabine remains a major cause of failure for the clinical treatment of this disease. Polo-like kinase 1 (Plk-1) is highly expressed in pancreatic cancer cell lines and pancreatic tumour tissues, and is involved in a wide variety of cell cycle processes. Nevertheless, its biological role and implication for gemcitabine resistance are not clearly defined. In this study, we used RNA-interference (RNAi)-mediated depletion of Plk-1 to determine its potential for sensitizing pancreatic tumour cells to gemcitabine. We showed that the level of Plk-1 protein was correlated significantly with gemcitabine resistance in human pancreatic adenocarcinoma cells and that overexpression of Plk-1 reduced sensitivity to gemcitabine in these cells. In addition, small interfering RNA (siRNA)-mediated knockdown of Plk-1 caused cell cycle arrest at G2/M and the reduction of cellular proliferation. More importantly, the treatment of pancreatic cancer cells with Plk-1 siRNA followed by exposure to gemcitabine dramatically decreased cell viability and increased cellular apoptosis, as compared with treatment with either agent alone. These observations indicate that down-regulation of Plk-1 expression by RNAi enhances gemcitabine sensitivity and increases gemcitabine cytotoxicity in pancreatic tumour cells. This is the first demonstration that the combination of Plk-1 gene therapy and gemcitabine chemotherapy has synergistic anti-tumour activity against pancreatic carcinoma in vitro. This combination treatment warrants further investigation as an effective therapeutic regimen for patients with resistant pancreatic cancer and other tumours.
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Affiliation(s)
- C Yu
- Department of Surgery, First Affiliated Hospital, Nanjing Medical UniversityNanjing, P. R. China
- Department of Surgery, Beijing Aerospace General HospitalBeijing, P. R. China
| | - X Zhang
- Institute of Pediatric Medicine, Nanjing Medical UniversityNanjing, P. R. China
| | - G Sun
- Department of Surgery, First Affiliated Hospital, Nanjing Medical UniversityNanjing, P. R. China
| | - X Guo
- Institute of Pediatric Medicine, Nanjing Medical UniversityNanjing, P. R. China
| | - H Li
- Department of Surgery, First Affiliated Hospital, Nanjing Medical UniversityNanjing, P. R. China
| | - Y You
- Department of Surgery, First Affiliated Hospital, Nanjing Medical UniversityNanjing, P. R. China
| | - J L Jacobs
- Laboratory of Receptor Biology and Gene Expression, Center for Cancer Research, National Cancer Institute National Institutes of Health, Bethesda, MD, USA
| | - K Gardner
- Laboratory of Receptor Biology and Gene Expression, Center for Cancer Research, National Cancer Institute National Institutes of Health, Bethesda, MD, USA
| | - D Yuan
- Laboratory of Pathophysiology Medical School ofHubei Institute for NationalitiesEnshi, P. R. China
| | - Z Xu
- Department of Surgery, First Affiliated Hospital, Nanjing Medical UniversityNanjing, P. R. China
| | - Q Du
- Department of Surgery, First Affiliated Hospital, Nanjing Medical UniversityNanjing, P. R. China
| | - C Dai
- Department of Surgery, First Affiliated Hospital, Nanjing Medical UniversityNanjing, P. R. China
| | - Z Qian
- Department of Surgery, First Affiliated Hospital, Nanjing Medical UniversityNanjing, P. R. China
| | - K Jiang
- Department of Surgery, First Affiliated Hospital, Nanjing Medical UniversityNanjing, P. R. China
| | - Y Zhu
- Department of Surgery, First Affiliated Hospital, Nanjing Medical UniversityNanjing, P. R. China
| | - Q Q Li
- Laboratory of Receptor Biology and Gene Expression, Center for Cancer Research, National Cancer Institute National Institutes of Health, Bethesda, MD, USA
| | - Y Miao
- Department of Surgery, First Affiliated Hospital, Nanjing Medical UniversityNanjing, P. R. China
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Jacobs JL, Carroll TL, Sundin GW. The role of pigmentation, ultraviolet radiation tolerance, and leaf colonization strategies in the epiphytic survival of phyllosphere bacteria. Microb Ecol 2005; 49:104-13. [PMID: 15883865 DOI: 10.1007/s00248-003-1061-4] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2003] [Accepted: 11/19/2003] [Indexed: 05/02/2023]
Abstract
Phenotypic mechanisms that enhance bacterial UVR survival typically include pigmentation and DNA repair mechanisms which provide protection from UVA and UVB wavelengths, respectively. In this study, we examined the contribution of pigmentation to field survival in Clavibacter michiganensis and evaluated differences in population dynamics and leaf colonization strategies. Two C. michiganensis pigment-deficient mutants were significantly reduced in UVA radiation survival in vitro; one of these mutants also exhibited reduced field populations on peanut when compared to the wild-type strain over the course of replicate 25-day experiments. The UVR-tolerant C. michiganensis strains G7.1 and G11.1 maintained larger epiphytic field populations on peanut compared to the UVR-sensitive C. michiganensis T5.1. Epiphytic field populations of C. michiganensis utilized the strategy of solar UVR avoidance during leaf colonization resulting in increased strain survival on leaves after UVC irradiation. These results further demonstrate the importance of UVR tolerance in the ability of bacterial strains to maintain population size in the phyllosphere. However, an examination of several bacterial species from the peanut phyllosphere and a collection of environmental Pseudomonas spp. revealed that sensitivity to UVA and UVC radiation was correlated in some but not all of these bacteria. These results underscore a need to further understand the biological effects of different solar wavelength groups on microbial ecology.
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Affiliation(s)
- J L Jacobs
- Department of Plant Pathology and Microbiology, Texas A & M University, College Station, TX 77843, USA
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Abstract
The effect of solar UV-B radiation on the population dynamics and composition of the culturable bacterial community from peanut (Arachis hypogeae L.) was examined in field studies using plants grown under UV-B-transmitting (UV-B+) or UV-B-excluding (UV-B-) plastic filters. Our data demonstrate that solar UV-B selection alters phyllosphere bacterial community composition and that UV tolerance is a prevalent phenotype late in the season. The total bacterial population size was not affected by either UV-B treatment. However, isolates from the UV-B+ plots (n = 368) were significantly more UV tolerant than those from the UV-B- (n = 363) plots. UV sensitivity was determined as the minimal inhibitory dose of UV that resulted in an inhibition of growth compared to the growth of a nonirradiated control. The difference in minimal inhibitory doses among bacterial isolates from UV-B+ and UV-B- treatments was mainly partitioned among nonpigmented isolates, with pigmented isolates as a group being characterized as UV tolerant. A large increase in UV tolerance was observed within isolate groups collected late (89 and 96 days after planting) in the season. Identification of 200 late-season isolates indicated that the predominant UV-tolerant members of this group were Bacillus coagulans, Clavibacter michiganensis, and Curtobacterium flaccumfaciens. We selected C. michiganensis as a model UV-tolerant epiphyte to study if cell survival on UV-irradiated peanut leaves was increased relative to UV survival in vitro. The results showed an enhancement in the survival of C. michiganensis G7.1, especially following high UV-C doses (300 and 375 J m(-2)), that was evident between 24 and 96 h after inoculation. A dramatic increase in the in planta/in vitro survival ratio was observed over the entire 96-h experiment period for C. michiganensis T5.1.
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Affiliation(s)
- J L Jacobs
- Department of Plant Pathology and Microbiology, Texas A&M University, College Station 77843-2132, USA
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Sundin GW, Jacobs JL, Murillo J. Sequence diversity of rulA among natural isolates of Pseudomonas syringae and effect on function of rulAB-mediated UV radiation tolerance. Appl Environ Microbiol 2000; 66:5167-73. [PMID: 11097885 PMCID: PMC92439 DOI: 10.1128/aem.66.12.5167-5173.2000] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The rulAB locus confers tolerance to UV radiation and is borne on plasmids of the pPT23A family in Pseudomonas syringae. We sequenced 14 rulA alleles from P. syringae strains representing seven pathovars and found sequence differences of 1 to 12% within pathovar syringae, and up to 15% differences between pathovars. Since the sequence variation within rulA was similar to that of P. syringae chromosomal alleles, we hypothesized that rulAB has evolved over a long time period in P. syringae. A phylogenetic analysis of the deduced amino acid sequences of rulA resulted in seven clusters. Strains from the same plant host grouped together in three cases; however, strains from different pathovars grouped together in two cases. In particular, the rulA alleles from P. syringae pv. lachrymans and P. syringae pv. pisi were grouped but were clearly distinct from the other sequenced alleles, suggesting the possibility of a recent interpathovar transfer. We constructed chimeric rulAB expression clones and found that the observed sequence differences resulted in significant differences in UV (wavelength) radiation sensitivity. Our results suggest that specific amino acid changes in RulA could alter UV radiation tolerance and the competitiveness of the P. syringae host in the phyllosphere.
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Affiliation(s)
- G W Sundin
- Department of Plant Pathology and Microbiology, Texas A&M University, College Station, Texas 77843-2132, USA.
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Jacobs JL, Porter WD. Preventing workplace violence: looking at your hiring and termination processes. Director 2000; 7:66-9; quiz 79-80. [PMID: 10703331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
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Sundin GW, Jacobs JL. Ultraviolet Radiation (UVR) Sensitivity Analysis and UVR Survival Strategies of a Bacterial Community from the Phyllosphere of Field-Grown Peanut (Arachis hypogeae L.). Microb Ecol 1999; 38:27-38. [PMID: 10384007 DOI: 10.1007/s002489900152] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
> Abstract The short-term population dynamics of the culturable bacterial community from field-grown peanut (Arachis hypogeae L.) was analyzed over three 2-day periods. As in other phyllosphere studies, significant numbers of pigmented organisms were detected, suggesting the importance of pigmentation in the colonization of this habitat. Isolates were grouped according to pigmentation (orange, pink, yellow, nonpigmented), and the sensitivity of each isolate in the collection (n = 617) to ultraviolet radiation (UVR) was determined as the minimal inhibitory dose (MIDC) of UVR that resulted in an inhibition of growth compared to an unirradiated control. The majority of isolates recovered (56.1%) had an MIDC equal to or exceeding that of Pseudomonas syringae 8B48, a known UV-tolerant strain. Among pigmentation groups, the mean MIDC of pink- and orange-pigmented isolates was significantly greater than that of yellow- or nonpigmented isolates at each sampling time of day. Identification of 213 of the isolates using fatty acid methyl ester analysis indicated that a large proportion of the isolates were gram-positive, with Bacillus spp. alone accounting for 35.7% of the total. The genus Curtobacterium contained the largest percentage of highly UVR-tolerant strains. Nonpigmented mutants of four Curtobacterium strains were selected following ethyl methane sulfonate mutagenesis; these nonpigmented mutants were significantly altered in survival following irradiation with UV-A wavelengths. The strategy of avoidance of UVR through colonization of the abaxial leaf surface was evaluated on three separate occasions by leaf imprint sampling. Only 3 of 120 leaves (2.5%) contained larger bacterial populations on the adaxial surface, indicating that colonization of the abaxial leaf surface is important to phyllosphere survival. Our results indicate that tolerance to UVR is a common phenotype among phyllosphere bacteria, suggesting that solar radiation has a strong influence on the microbial ecology of the phyllosphere.http://link.springer-ny.com/link/service/journals/00248/bibs/38n1p27.html
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Affiliation(s)
- GW Sundin
- Department of Plant Pathology and Microbiology, Texas A&M University, College Station, TX 77843-2132, USA
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Jacobs JL, Porter WD. Workplace violence: dealing with the abusive patient. Balance 1999; 3:22-4. [PMID: 10557766] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
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Jacobs JL, Porter WD. The dynamics of workplace violence. Balance 1999; 3:27-9. [PMID: 10346526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
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Abstract
PURPOSE This study of volume replacement in anophthalmic sockets compares the volume replaced by the implant and prosthesis with the volume removed from the socket and evaluates A-scan ultrasonography as a tool to predict an ideal implant size before enucleation. METHODS In this retrospective study of 59 anophthalmic patients, the volume replaced by the implant and the prosthesis was compared with the volume of the enucleated eye. The volume removed was estimated by calculating the volume of the fellow eye using A-scan ultrasonography. Enophthalmos and superior sulcus deformity were measured and correlated with the percent volume replacement in the anophthalmic sockets. RESULTS Greater enophthalmos and superior sulcus deformity were found in patients with less than 100% volume replacement compared with those with 100% or more volume replacement. The axial length determined by A-scan ultrasonography of the fellow eye suggested that a larger implant size should have been placed in 76.3% of those patients with less than 100% volume replacement. Sixty-three percent of adult patients could have received an implant more than 22 mm in diameter to fill 80% of the volume removed at enucleation. CONCLUSIONS A-scan ultrasonography of the fellow eye provides a useful tool for predicting the implant size before surgery for optimal volume replacement.
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Affiliation(s)
- S A Kaltreider
- Department of Ophthalmology, University of Virginia, Charlottesville, USA
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Merrick ST, Sepkowitz KA, Walsh J, Damson L, McKinley P, Jacobs JL. Comparison of induced versus expectorated sputum for diagnosis of pulmonary tuberculosis by acid-fast smear. Am J Infect Control 1997; 25:463-6. [PMID: 9437484 DOI: 10.1016/s0196-6553(97)90068-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
OBJECTIVE To evaluate the sensitivity of induced versus expectorated sputum for the diagnosis of pulmonary tuberculosis by acid-fast smear. METHODS We performed a retrospective review of data on patients with cultures from respiratory secretions that were positive for Mycobacterium tuberculosis. We analyzed data on the 114 patients with positive cultures during a 4-year period in an urban tertiary care academic medical center. RESULTS Sputum samples had been obtained for 103 of the 114 patients with cultures positive for tuberculosis. Forty-four of the 114 patients were HIV seropositive. Overall 33 of 79 patients (42%) had positive acid-fast smears of expectorated sputum, and 6 of 24 (25%) had positive smears of induced sputum (p = 0.21). When data were analyzed for subgroups by HIV serostatus, there was no significant difference in the results. Estimated cost of sputum induction for 1 year was approximately $45,000. CONCLUSIONS We found sputum induction to be costly, and induced sputum offered no advantage over routine expectorated sputum for the diagnosis of pulmonary tuberculosis.
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Affiliation(s)
- S T Merrick
- Division of Infectious Disease, New York Hospital-Cornell Medical Center, NY 10021, USA
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Abstract
Blepharoplasty is one of the most successful aesthetic surgical procedures. Careful preoperative planning and conservative tissue resections can help to minimize complications and optimize results. Although some young patients request blepharoplasty specifically because of age-related changes in the eyelid skin, the surgery is that of sculpture and contouring of the entire aesthetic unit. The aging process in the eyelid complex is characterized by skin texture changes with loss of elasticity and formation of wrinkles, fat redistribution, enophthalmos, and anterior displacement of fat with a lower eyelid orbital fat prolapse. Once the etiology of the deformity and the associated periorbital anatomy are recognized, a local assessment and surgical treatment plan can produce optimal results.
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Affiliation(s)
- H I Baylis
- Department of Ophthalmology, UCLA Jules Stein Eye Institute, USA
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Biquet G, Brichant JF, Dewandre PY, De Sart F, Dubois M, Foidart JM, Garnir D, Gaspard U, Gillot M, Hardy A, Herman P, Jacobs JL, Laloux F, Lifrange E, Retz C, Rigo J, Serilas M, Schaaps JP, Theunissen I, Thoumsin H, Van Cauwenberge JR, Van den Brule F. [Obstetric perspectives: consensus of the gynecology department of the University of Liège. Document of the 3rd cycle studies, October 96]. Rev Med Liege 1997; 52:142-148. [PMID: 9213901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Affiliation(s)
- G Biquet
- Département de Gynécologie-Obstétrique, Université de Liège
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Ball SC, Sepkowitz KA, Jacobs JL. Thalidomide for treatment of oral aphthous ulcers in patients with human immunodeficiency virus: case report and review. Am J Gastroenterol 1997; 92:169-70. [PMID: 8995965] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- S C Ball
- Center for Special Studies, New York Hospital-Cornell Medical Center, New York, USA
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Maquoi E, Schaaps JP, Jacobs JL, Noël A, Foidart JM. [Preeclampsia resulting from placental defects: biology to clinical considerations]. Rev Med Liege 1997; 52:478-84. [PMID: 9289785] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- E Maquoi
- Service de Biologie générale, Université de Liège
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Chan RS, Gorga D, Ilaria G, Damson L, Jacobs JL. Quality-of-life issues in individuals with HIV disease: an occupational therapy perspective. AIDS Patient Care STDS 1996; 10:236-9. [PMID: 11361594 DOI: 10.1089/apc.1996.10.236] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- R S Chan
- Center for Special Studies, New York Hospital/Cornell University Medical Center, NY, USA
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Jacobs JL, Damson LC, Rogers DE. One approach to care for patients infected with human immunodeficiency virus in an academic medical center. Bull N Y Acad Med 1996; 73:301-13. [PMID: 8982523 PMCID: PMC2359323] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The human immunodeficiency virus (HIV) epidemic poses unprecedented challenges to the health-care system. Caregivers must contend both with the complicated clinical syndromes associated with HIV infection and with issues that are central to the epidemic, such as discrimination, isolation, poverty, and substance abuse. Our HIV treatment program combines and enhances the resources of an academic medical center in a multidisciplinary care model. All patients, regardless of payor class, are offered services from 10 different disciplines. The same team of clinicians follows patients in the clinic and hospital. The program is flexible, non-hierarchical, and open to community participation. This approach may be a useful model for other institutions.
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Affiliation(s)
- J L Jacobs
- Center for Special Studies, New York Hospital/Cornell University Medical Center, New York 10021, USA
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Abstract
To determine the accuracy of school-based childhood immunization records and to describe the effects of their use on estimates of community-wide immunization coverage, we verified the immunizations to 72 months of age for children born in 1986 to residents in Dallas County, TX, and in Minnesota. Verified immunizations were compared with those documented in the school record. Major transcription errors accounted for fewer than 1% of discrepancies between school and provider records. For 99 subjects with 987 verified immunizations in Minnesota, age-appropriate immunization coverage estimated from the school records was within two percent of actual coverage. For 86 subjects with 981 verified immunizations in Dallas County, age-appropriate immunization coverage from the school records underestimated actual coverage by as much as 21%. The primary factor explaining the underestimate in Dallas was incomplete school immunization records for 33 (38%) subjects and 126 (13%) immunizations. Selective recording of immunizations related to the minimum state requirements in Texas contributed to incomplete school records in Dallas County. Verification of the completeness of records selected to estimate immunization coverage is essential if the estimates are used to monitor trends or to make public policy decisions.
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Affiliation(s)
- T V Murphy
- Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas 75235-9063, USA
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Jacobs JL, Morris RJ, Zorrilla-Rios J. Effect of ensiling whole barley grain with pasture on silage quality and effluent production, and the performance of growing cattle. ACTA ACUST UNITED AC 1995. [DOI: 10.1071/ea9950731] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Pasture was ensiled with increasing amounts of whole barley in stacks [0, 75 (SLB), 150 (SMB) kg/t fresh pasture] or in 200-L drum silos 10, 75 (DLB), 150 (DMB), 225 (DHB) kg/t fresh pasture]. All silages were well fermented with low pH values and low ammonia concentrations. The addition of barley significantly (P<0.05) increased the dry matter content of the resultant stack silages by 29% (SLB) and 54% (SMB) and significantly (P<0.05) increased residual water-soluble carbohydrate levels in the SMB silage compared with untreated stack silage. Incorporation of barley with pasture in 200-L silos significantly (P<0.001) increased the dry matter of the resultant silages and significantly (P<0.01) reduced effluent production by 55, 93, and 100% for DLB, DMB, and DHB compared with the untreated silo silage. Dry matter, nitrogen, and lactic acid concentrations in effluent did not differ significantly, although total losses of these components were significantly (P<0.01) higher in the untreated silage.| The stack silages were fed to beef steers (293 kg) and compared with silage diets containing equivalent levels of rolled barley mixed with untreated silage at feeding. Irrespective of method of feeding barley, animal performance improved compared with feeding a silage-only diet. At equivalent levels of barley inclusion, liveweight gains were higher and feed conversion ratios lower with the rolled barley diets. The results indicate that the addition of barley to low dry matter pasture during ensiling can reduce effluent production and the loss of soluble nutrients; however, it is likely that the grain will need to be processed to maximise subsequent animal production.
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