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Izadbakhsh MH, Hashemzadeh F, Alikhani M, Ghorbani GR, Khorvash M, Heidari M, Ghaffari MH, Ahmadi F. Effects of Dietary Fiber Level and Forage Particle Size on Growth, Nutrient Digestion, Ruminal Fermentation, and Behavior of Weaned Holstein Calves under Heat Stress. Animals (Basel) 2024; 14:275. [PMID: 38254444 PMCID: PMC10812499 DOI: 10.3390/ani14020275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2023] [Revised: 12/26/2023] [Accepted: 01/11/2024] [Indexed: 01/24/2024] Open
Abstract
This experiment was designed to investigate the effects of feeding diets with different fiber content and forage particle size on the performance, health, nutrient digestion, rumen fermentation, and behavioral and sorting activity of Holstein dairy calves kept under elevated environmental temperature. Sixty weaned Holstein female calves (age = 96.7 ± 7.62 days old; body weight = 82.4 ± 10.4 kg) were randomly assigned to one of 4 treatments arranged in a 2-by-2 factorial design in a 70-day experiment. Dietary forage content (moderate, 22.5%; or high, 40.0% on DM basis) and alfalfa hay particle size (short, 4.39 mm; or long, 7.22 mm as geometric mean) were the experimental factors, resulting in the following combinations: (1) high-fiber (HF) diets with forage-to-concentrate ratio of 40:60 and long particle-sized alfalfa hay (LPS; HF-LPS); (2) HF diets with short particle-sized alfalfa hay (SPS; HF-SPS); (3) moderate-fiber (MF) diets with forage-to-concentrate ratio of 22.5:77.5 with LPS (MF-LPS); and (4) MF diets with SPS (MF-SPS). The temperature-humidity index averaged 73.0 ± 1.86, indicating that weaned calves experienced a moderate extent of heat stress. Fiber level and AH particle size interacted and affected dry matter intake, with the greatest intake (4.83 kg/d) observed in MF-SPS-fed calves. Final body weight was greater in calves receiving MF vs. HF diets (164 vs. 152 kg; p < 0.01). Respiration rate decreased when SPS vs. LPS AH was included in HF but not MF diet. Lower rectal temperature was recorded in calves fed MF vs. HF diet. Digestibility of dry matter and crude protein was greater in calves fed MF than HF diets, resulting in lower ruminal pH (6.12 vs. 6.30; p = 0.03). Fiber digestibility was greater in calves fed SPS compared with those fed LPS alfalfa hay. Feeding HF compared with MF diet increased acetate but lowered propionate molar proportions. The inclusion of SPS vs. LPS alfalfa hay decreased lying time in HF diet (920 vs. 861 min; p < 0.01). Calves fed MF vs. HF diets spent less time eating but more time lying, which is likely indicative of better animal comfort. Dietary fiber level and forage particle size interacted and affected sorting against 19 mm particles, the extent of which was greater in HF-SPS diet. Overall, dietary fiber level had a stronger effect than forage particle size on the performance of weaned calves exposed to a moderate degree of heat stress as feeding MF vs. HF diet resulted in greater feed intake, final body weight, structural growth measures, nutrient digestion, as well as longer lying behavior. The inclusion of SPS alfalfa hay in MF diets increased feed consumption.
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Affiliation(s)
- Mohammad-Hossein Izadbakhsh
- Department of Animal Sciences, College of Agriculture, Isfahan University of Technology, Isfahan 84156-83111, Iran (F.H.)
| | - Farzad Hashemzadeh
- Department of Animal Sciences, College of Agriculture, Isfahan University of Technology, Isfahan 84156-83111, Iran (F.H.)
| | - Masoud Alikhani
- Department of Animal Sciences, College of Agriculture, Isfahan University of Technology, Isfahan 84156-83111, Iran (F.H.)
| | - Gholam-Reza Ghorbani
- Department of Animal Sciences, College of Agriculture, Isfahan University of Technology, Isfahan 84156-83111, Iran (F.H.)
| | - Mohammad Khorvash
- Department of Animal Sciences, College of Agriculture, Isfahan University of Technology, Isfahan 84156-83111, Iran (F.H.)
| | - Mostafa Heidari
- Department of Animal Sciences, College of Agriculture, Isfahan University of Technology, Isfahan 84156-83111, Iran (F.H.)
| | | | - Farhad Ahmadi
- School of Agriculture, Food and Ecosystem Sciences, Faculty of Science, The University of Melbourne, Parkville, VIC 3010, Australia
- Department of Eco-Friendly Livestock Science, Institute of Green Bio Science and Technology, Seoul National University, Pyeongchang 25354, Republic of Korea
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Petzel EA, Acharya S, Zeltwanger JM, Bailey EA, Brake DW. Effects of corn processing and cattle size on total tract digestion and energy and nitrogen balance. J Anim Sci 2021; 99:6438515. [PMID: 34849985 DOI: 10.1093/jas/skab349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Accepted: 11/22/2021] [Indexed: 11/12/2022] Open
Abstract
This study used 18 calves (295 ± 29 kg) and 18 yearlings (521 ± 29 kg) fed whole, cracked, or steam-flaked corn (SFC) to evaluate nutrient digestion and energy balance across different types of processed corn and sizes of cattle. Cattle were fed a diet comprised of 75% corn (dry matter [DM]-basis) from whole, cracked, or SFC to 2.5-times maintenance energy requirements. Subsequently, cattle were placed in individual stanchions, and urine and feces were collected together with measures of gas production via indirect calorimetry. Data were analyzed using the MIXED procedure of SAS. There was no interaction between corn processing and cattle size (P ≥ 0.40). Time spent ruminating (min/d) and rumination rate (min/kg DM intake [DMI]) were not affected by corn processing or cattle size. The eating rate (min/kg DMI) was faster (P < 0.01) for yearlings compared with calves. Total tract starch digestion was greatest (P = 0.01) for cattle fed SFC (97.5%), intermediate in cattle fed cracked (92.4%), and least in cattle fed whole corn (89.5%). Dietary digestible energy and metabolizable energy (Mcal/kg DMI) were greater (P ≤ 0.05) for cattle fed SFC compared with cracked or whole. A greater proportion of digestible energy was lost to heat production (P = 0.01) in cattle fed whole corn compared with cracked and tended to be greater (P = 0.08) in cattle fed SFC than cracked. Conversion of digestible energy to metabolizable energy in this study was more closely related to a dynamic model used to estimate metabolizable energy of feeds to dairy cows than to a linear model used to predict metabolizable energy of feeds to beef cattle. If library estimates of net energy for maintenance are correct, then retained energy (Mcal/d) should have been similar between each type of processed corn; however, retained energy was greater (P < 0.01) for cattle fed cracked compared with whole corn and tended to be greater (P = 0.06) compared with SFC. Yet, observed amounts of net energy based on measures of retained energy were not different (P ≥ 0.60) between cracked and SFC. Nitrogen balance was not affected (P ≥ 0.30) by corn processing or cattle size, although cattle fed cracked had numerically greater (P ≤ 035) N retention. These data indicate that physical processing of corn provides greater net energy to cattle in comparison to whole corn.
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Affiliation(s)
- Emily A Petzel
- Division of Animal Science, University of Missouri, Columbia, MO 65211, USA
| | - Subash Acharya
- Division of Animal Science, University of Missouri, Columbia, MO 65211, USA
| | | | - Eric A Bailey
- Division of Animal Science, University of Missouri, Columbia, MO 65211, USA
| | - Derek W Brake
- Division of Animal Science, University of Missouri, Columbia, MO 65211, USA
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Karami A, Alikhani M, Khorvash M, Hashemzadeh F, Sadeghi-Sefidmazgi A, Rafiee H, Ferraretto LF. Effects of different forage to concentrate ratios on performance, plasma metabolites, and feeding behaviour of weaned dairy calves from 70 to 120 days of age. ITALIAN JOURNAL OF ANIMAL SCIENCE 2021. [DOI: 10.1080/1828051x.2021.1962749] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Abbas Karami
- Department of Animal Sciences, College of Agriculture, Isfahan University of Technology, Isfahan, Iran
| | - Masoud Alikhani
- Department of Animal Sciences, College of Agriculture, Isfahan University of Technology, Isfahan, Iran
| | - Mohammad Khorvash
- Department of Animal Sciences, College of Agriculture, Isfahan University of Technology, Isfahan, Iran
| | - Farzad Hashemzadeh
- Department of Animal Sciences, College of Agriculture, Isfahan University of Technology, Isfahan, Iran
| | - Ali Sadeghi-Sefidmazgi
- Department of Animal Sciences, College of Agriculture, Isfahan University of Technology, Isfahan, Iran
| | - Hassan Rafiee
- Animal Science Research Department, Isfahan Agricultural and Natural Resources Research and Education Center, AREEO, Isfahan, Iran
| | - Luiz F. Ferraretto
- Department of Animal and Dairy Sciences, University of Wisconsin, Madison, WI, United States
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Gao X, Tang F, Zhang F, Jia C, Yang Z, Liu C, Gao W. Effects of the supplementation of distillers' grape residues on ruminal degradability, whole tract digestibility and nitrogen metabolism in sheep. Arch Anim Nutr 2019; 73:384-398. [PMID: 31315463 DOI: 10.1080/1745039x.2019.1590142] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Five ruminally and duodenally cannulated Kazakh male lambs (30 ± 2.75 kg) maintained singly in a metabolic cage were used in a 5 × 5 Latin square experiment to investigate the effect of supplementing a ration with five different levels of distillers' grape residue (DGR) on ruminal degradability, whole tract digestibility and nitrogen (N) metabolism of growing lambs. The rations were isoenergetic and isonitrogenous and contained 0, 3.85, 7.70, 11.55 and 15.41% DGR (DM basis). Each experimental period lasted for 18 d: 10 d for adaptation to the dietary treatment and 8 d for faecal, urinary, ruminal and duodenal digesta sample collections. The outflow rate of ruminal digesta increased (p = 0.032) linearly with the increased level of dietary neutral detergent fibre content, caused by the supplementation of DGR. As a result, the effective degradability of dry matter and crude protein decreased significantly with the treatments. Although the dietary intake of N, duodenal flow of total N, and the endogenous N at the duodenum were not affected by experimental treatments, N fractions in the digesta were altered. Ruminal microbial N decreased (p < 0.01) linearly; in contrast, ruminal un-degradable protein increased linearly (p < 0.01) in response to the increased addition of DGR. Although there was no significant difference in faecal N among treatments, N retention was increased linearly (p = 0.014), owing to the remarkable reduction (p = 0.016) of urinary N excretion with an increasing level of DGR. The results indicate that the DGR has some potential benefits of increasing the supply of bypass protein and of improving the utilisation efficiency of N for sheep. Therefore, the supplementation of DGR in ruminant feeding is recommended at levels not exceeding 10% of the diet.
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Affiliation(s)
- Xinmei Gao
- a College of Animal Science & Technology, Shihezi University , Shihezi City , P. R. China
| | - Fu Tang
- a College of Animal Science & Technology, Shihezi University , Shihezi City , P. R. China
| | - Fan Zhang
- a College of Animal Science & Technology, Shihezi University , Shihezi City , P. R. China
| | - Chunyun Jia
- a College of Animal Science & Technology, Shihezi University , Shihezi City , P. R. China
| | - Zhenhua Yang
- a College of Animal Science & Technology, Shihezi University , Shihezi City , P. R. China
| | - Chenli Liu
- a College of Animal Science & Technology, Shihezi University , Shihezi City , P. R. China
| | - Wei Gao
- a College of Animal Science & Technology, Shihezi University , Shihezi City , P. R. China
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Xie X, Wang J, Guan L, Liu J. Effect of changing forage on the dynamic variation in rumen fermentation in sheep. Anim Sci J 2017; 89:122-131. [DOI: 10.1111/asj.12915] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2017] [Accepted: 07/20/2017] [Indexed: 11/27/2022]
Affiliation(s)
- Xiao Xie
- Institute of Dairy Science College of Animal Sciences Zhejiang University Hangzhou China
| | - Jia‐kun Wang
- Institute of Dairy Science College of Animal Sciences Zhejiang University Hangzhou China
| | - Leluo Guan
- Institute of Dairy Science College of Animal Sciences Zhejiang University Hangzhou China
- Department of Agricultural Food and Nutritional Science University of Alberta Edmonton AB Canada
| | - Jian‐Xin Liu
- Institute of Dairy Science College of Animal Sciences Zhejiang University Hangzhou China
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Berends H, van den Borne J, Stockhofe-Zurwieden N, Gilbert M, Zandstra T, Pellikaan W, van Reenen C, Bokkers E, Gerrits W. Effects of solid feed level and roughage-to-concentrate ratio on ruminal drinking and passage kinetics of milk replacer, concentrates, and roughage in veal calves. J Dairy Sci 2015; 98:5621-9. [DOI: 10.3168/jds.2015-9367] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2015] [Accepted: 05/01/2015] [Indexed: 11/19/2022]
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Schadt I, Mertens D, Van Soest P, Azzaro G, Licitra G. Stage of lactation and corresponding diets affect in situ protein degradation by dairy cows. J Dairy Sci 2014; 97:7995-8007. [DOI: 10.3168/jds.2014-7987] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2014] [Accepted: 07/07/2014] [Indexed: 11/19/2022]
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Berends H, van den Borne J, Mollenhorst H, van Reenen C, Bokkers E, Gerrits W. Utilization of roughages and concentrates relative to that of milk replacer increases strongly with age in veal calves. J Dairy Sci 2014; 97:6475-84. [DOI: 10.3168/jds.2014-8098] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2014] [Accepted: 07/05/2014] [Indexed: 11/19/2022]
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Benhissi H, García-Rodríguez A, Beltrán de Heredia I. Effect of type and inclusion level of cold-pressed oilseed cakes on in vitro rumen fermentation. ANIMAL PRODUCTION SCIENCE 2014. [DOI: 10.1071/an14258] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The current study was conducted to explore the impact of inclusion of different types and levels of cold-pressed oilseed cakes on in vitro rumen fermentation and gas production parameters. Two batch fermentation trials (24 and 96 h) were conducted using the in vitro gas production technique. In each trial, three types of lipid sources [palm fat (PF), cold-pressed rapeseed cake (CPRC) and cold-pressed sunflower cake (CPSC)] × two levels of total fat (30 and 60 g/kg DM) were evaluated. Incubated substrates were made from iso-energetic and isoproteic basal mixtures of barley straw and concentrate (ratio 10 : 90). During the 24-h incubation trial, samples were collected 24 h post-incubation to measure volatile fatty acids (VFA) and methane production. The 96-h incubation was used to assess the rate and extent of in vitro gas production. CPSC showed lower total VFA (P < 0.001) and methane (P < 0.001) production, compared with PF and CPRC. High fat level decreased total VFA (P < 0.001) and methane (P < 0.001) production compared with low level of inclusion. Molar proportions of individual VFA and acetate to propionate ratio were not affected by lipid supplementation. CPSC reduced (P = 0.006) asymptotic gas production at high fat level, compared with PF and CPRC. Neither supplementation level nor type of lipid affected the fractional gas production rate or lag time. In conclusion, there was no difference in ruminal fermentation when either CPRC or PF were added but CPSC altered microbial fermentation in vitro at a total fat level of 60 g/kg DM.
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Yáñez-Ruiz DR, Martín-García AI, Weisbjerg MR, Hvelplund T, Molina-Alcaide E. A comparison of different legume seeds as protein supplement to optimise the use of low quality forages by ruminants. Arch Anim Nutr 2009; 63:39-55. [DOI: 10.1080/17450390802611479] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Walsh K, O’Kiely P, Taweel H, McGee M, Moloney A, Boland T. Intake, digestibility and rumen characteristics in cattle offered whole-crop wheat or barley silages of contrasting grain to straw ratios. Anim Feed Sci Technol 2009. [DOI: 10.1016/j.anifeedsci.2008.03.013] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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12
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Prakash B, Dhali A, Mech A, Khate K, Moaakum H, Rajkhowa C. Effect of feeding forest foliages, rice straw and concentrate-based total mixed ration on nutrient utilization and growth in mithun (Bos frontalis). Livest Sci 2008. [DOI: 10.1016/j.livsci.2007.12.021] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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13
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Effects of cereals and/or protein supplement extrusion on diet utilisation and performance of intensively reared cattle. Livest Sci 2008. [DOI: 10.1016/j.livsci.2007.12.014] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Increasing sodium bicarbonate level in high-concentrate diets for heifers. I. Effects on intake, water consumption and ruminal fermentation. Animal 2008; 2:705-12. [DOI: 10.1017/s1751731108001675] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Moody M, Zanton G, Daubert J, Heinrichs A. Nutrient Utilization of Differing Forage-to-Concentrate Ratios by Growing Holstein Heifers. J Dairy Sci 2007; 90:5580-6. [DOI: 10.3168/jds.2007-0570] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Robles V, González LA, Ferret A, Manteca X, Calsamiglia S. Effects of feeding frequency on intake, ruminal fermentation, and feeding behavior in heifers fed high-concentrate diets1. J Anim Sci 2007; 85:2538-47. [PMID: 17609471 DOI: 10.2527/jas.2006-739] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Four ruminally fistulated Holstein heifers (BW = 385 +/- 6.2 kg) were used in a 4 x 4 Latin square experiment to determine the effect of feeding frequency on intake, water consumption, ruminal fermentation, and feeding and animal behavior. The treatments consisted of different feeding frequencies: a) once daily (T1); b) twice daily (T2); c) 3 times daily (T3); and d) 4 times daily (T4). Heifers were offered ad libitum access to concentrate and barley straw. Feeding frequency did not affect DMI (P >0.10), but water consumption tended to increase linearly as feeding frequency increased (P = 0.08). Average ruminal pH was not affected (P >0.10) by feeding frequency, but at 12 h after feeding ruminal pH was greater for T2 than for the other treatments. Total VFA concentration and VFA proportions were not affected (P >0.10) by feeding frequency, except valerate proportion, which increased linearly (P = 0.05) as feeding frequency increased. The concentration of ammonia-N was affected (P <0.05) cubically as feeding frequency increased (greatest for T3 = 9.3 mg of N/100 mL; lowest for T2 = 7.2 mg of N/100 mL). Feeding frequency had no effect on daily percentages of behavioral activities (P >0.05), except for observational behavior, for which there was a linear decrease as feeding frequency increased (P = 0.02). Heifers spent the same time on chewing activities, independent of feeding frequency. However, meal criteria tended to be affected (P = 0.07) by feeding frequency, with T2 (39.4 min) showing the longest intermeal interval. Total daily meal time, meal frequency, and meal size were not affected by feeding frequency (P >0.10), whereas meal length and eating rate showed cubic tendencies (P = 0.10 and P = 0.06, respectively) as feeding frequency increased. These results suggest that in the present experimental conditions, with heifers fed high-concentrate diets and with noncompetitive feeding, a smaller range of ruminal pH values was observed when feed was offered twice daily. Although heifers spent the same time on chewing activities, more stable ruminal conditions were probably achieved by feeding twice daily due to the rumination pattern, which was more constant during daytime in T2 than in T1. Moreover, when daytime and nighttime ruminating activity were analyzed separately, this activity was different in T1 (17.3 vs. 30.8%, respectively; P <0.05) but not in T2 (21.5 vs. 28.0%, respectively; P >0.05).
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Affiliation(s)
- V Robles
- Departament de Ciencia Animal i dels Aliments, Universitat Autònoma de Barcelona, 08193-Bellaterra, Spain
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Rotger A, Ferret A, Calsamiglia S, Manteca X. Effects of nonstructural carbohydrates and protein sources on intake, apparent total tract digestibility, and ruminal metabolism in vivo and in vitro with high-concentrate beef cattle diets. J Anim Sci 2006; 84:1188-96. [PMID: 16612021 DOI: 10.2527/2006.8451188x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
To investigate the effects of synchronizing nonstructural carbohydrate (NSC) and protein degradation on intake and rumen microbial fermentation, four ruminally fistulated Holstein heifers (BW = 132.3 +/- 1.61 kg) fed high-concentrate diets were assigned to a 4 x 4 Latin square design with a 2 x 2 factorial arrangement of treatments studied in vivo and in vitro with a dual-flow continuous culture system. Two NSC sources (barley and corn) and 2 protein sources [soybean meal (SBM) and sunflower meal (SFM)] differing in their rate and extent of ruminal degradation were combined resulting in a synchronized rapid fermentation diet (barley-SFM), a synchronized slow fermentation diet (corn-SBM), and 2 unsynchronized diets with a rapidly and a slowly fermenting component (barley-SBM, and corn-SFM). In vitro, the fermentation profile was studied at a constant pH of 6.2, and at a variable pH with 12 h at pH 6.4 and 12 h at pH 5.8. Synchronization tended to result in greater true OM digestion (P = 0.072), VFA concentration (P = 0.067), and microbial N flow (P = 0.092) in vitro, but had no effects on in vivo fermentation pattern or on apparent total tract digestibility. The NSC source affected the efficiency of microbial protein synthesis in vitro, tending to be greater (P = 0.07) for barley-based diets, and in vivo, the NSC source tended to affect intake. Dry matter and OM intake tended to be greater (P > or = 0.06) for corn- than barley-based diets. Ammonia N concentration was lower in vitro (P = 0.006) and tended to be lower in vivo (P = 0.07) for corn- than barley-based diets. In vitro, pH could be reduced from 6.4 to 5.8 for 12 h/d without any effect on ruminal fermentation or microbial protein synthesis. In summary, ruminal synchronization seemed to have positive effects on in vitro fermentation, but in vivo recycling of endogenous N or intake differences could compensate for these effects.
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Affiliation(s)
- A Rotger
- Departament de Ciència Animal i dels Aliments, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
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Rotger A, Ferret A, Manteca X, Ruiz de la Torre JL, Calsamiglia S. Effects of dietary nonstructural carbohydrates and protein sources on feeding behavior of tethered heifers fed high-concentrate diets. J Anim Sci 2006; 84:1197-204. [PMID: 16612022 DOI: 10.2527/2006.8451197x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
To describe the feeding behavior of growing heifers fed high-concentrate diets with different sources of protein and nonstructural carbohydrates, and to explain the ruminal fermentation pattern, 4 ruminally fistulated Holstein heifers (BW = 132.3 +/- 1.61 kg) were assigned to a 4 x 4 Latin square design with a 2 x 2 factorial arrangement of treatments. Two non-structural carbohydrate sources (barley and corn) and 2 protein sources [soybean meal (SBM) and sunflower meal (SFM)] that differ in their rate and extent of ruminal degradation were combined, resulting in a synchronized, rapid fermentation diet (barley-SFM), a synchronized, slow fermentation diet (corn-SBM), and 2 unsynchronized diets consisting of a rapidly and a slowly fermenting component (barley-SBM and corn-SFM). The corn-SFM diet resulted in a lower frequency of feeding (P < or = 0.05), longer meal length (P < or = 0.043), and larger meal size (P < or = 0.037) than the other 3 diets. Dietary treatment had no effect (P > or = 0.09) on the daily percentages of posture and behaviors. In general, heifers spent 9.97 +/- 0.83% of the day eating, 2.11 +/- 0.42% drinking, 25.13 +/- 1.36% ruminating, 16.97 +/- 1.42% in other activities such as social behavior and self-grooming, and the rest of the day (45.82 +/- 2.55%) resting or doing no chewing activities. Eating, drinking, and social behaviors were performed while standing (P < or = 0.01), whereas resting and ruminating occurred mainly while lying (P = 0.001). Eating took place mainly in the first 4 h after feeding (P = 0.001), whereas ruminating occurred mainly at night (P = 0.001). When chewing activities (eating and ruminating) were expressed per kilogram of DM or NDF from roughage intake, more time (P = 0.004) was spent chewing per kilogram of DMI for barley-based diets, and per kilogram of NDF from roughage intake for barley- (P = 0.01) and SFM- (P = 0.002) based diets. Tethered heifers fed the more fermentable and rapidly synchronized diet (barley-SFM) reduced intake and increased chewing time. With these high-concentrate diets, time spent chewing was inversely related to roughage intake.
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Affiliation(s)
- A Rotger
- Departament de Ciència Animal i dels Aliments, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
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Rotger A, Ferret A, Calsamiglia S, Manteca X. In situ degradability of seven plant protein supplements in heifers fed high concentrate diets with different forage to concentrate ratio. Anim Feed Sci Technol 2006. [DOI: 10.1016/j.anifeedsci.2005.05.017] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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