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Delavaux CS, Angst JK, Espinosa H, Brown M, Petticord DF, Schroeder JW, Broders K, Herre EA, Bever JD, Crowther TW. Fungal community dissimilarity predicts plant-soil feedback strength in a lowland tropical forest. Ecology 2024; 105:e4200. [PMID: 37897325 DOI: 10.1002/ecy.4200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Revised: 06/09/2023] [Accepted: 10/03/2023] [Indexed: 10/30/2023]
Abstract
Soil microbes impact plant community structure and diversity through plant-soil feedbacks. However, linking the relative abundance of plant pathogens and mutualists to differential plant recruitment remains challenging. Here, we tested for microbial mediation of pairwise feedback using a reciprocal transplant experiment in a lowland tropical forest in Panama paired with amplicon sequencing of soil and roots. We found evidence that plant species identity alters the microbial community, and these changes in microbial composition alter subsequent growth and survival of conspecific plants. We also found that greater community dissimilarity between species in their arbuscular mycorrhizal and nonpathogenic fungi predicted increased positive feedback. Finally, we identified specific microbial taxa across our target functional groups that differentially accumulated under conspecific settings. Collectively, these findings clarify how soil pathogens and mutualists mediate net feedback effects on plant recruitment, with implications for management and restoration.
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Affiliation(s)
- Camille S Delavaux
- Department of Environmental Systems Science, ETH, Zurich, Switzerland
- Department of Ecology and Evolutionary Biology, The University of Kansas, Lawrence, Kansas, USA
- Kansas Biological Survey, The University of Kansas, Lawrence, Kansas, USA
- Smithsonian Tropical Research Institute, Panama City, Panama
| | - Janika K Angst
- Department of Environmental Systems Science, ETH, Zurich, Switzerland
| | - Hilario Espinosa
- Smithsonian Tropical Research Institute, Panama City, Panama
- Department of Evolutionary and Environmental Biology, University of Haifa, Haifa, Israel
- Sistema Nacional de Investigación, SENACYT, Panama City, Panama
- Universidad de Panama, Facultad de Ciencias Naturales, Exactas y Tecnología, Departamento de Botánica, Panama City, Panama
- Coiba Scientific Station (Coiba AIP), Panama City, Panama
| | - Makenna Brown
- Department of Ecology and Evolutionary Biology, University of California Los Angeles, Los Angeles, California, USA
| | - Daniel F Petticord
- Smithsonian Tropical Research Institute, Panama City, Panama
- Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, New York, USA
| | | | - Kirk Broders
- Smithsonian Tropical Research Institute, Panama City, Panama
- Agricultural Research Service, National Center for Agricultural Utilization Research, Mycotoxin Prevention and Applied Microbiology Research Unit, Peoria, Illinois, USA
| | - Edward A Herre
- Smithsonian Tropical Research Institute, Panama City, Panama
| | - James D Bever
- Kansas Biological Survey, The University of Kansas, Lawrence, Kansas, USA
- Smithsonian Tropical Research Institute, Panama City, Panama
| | - Thomas W Crowther
- Department of Environmental Systems Science, ETH, Zurich, Switzerland
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Schroeder JW, Dobson A, Mangan SA, Petticord DF, Herre EA. Mutualist and pathogen traits interact to affect plant community structure in a spatially explicit model. Nat Commun 2020; 11:2204. [PMID: 32371877 PMCID: PMC7200732 DOI: 10.1038/s41467-020-16047-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [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: 01/13/2020] [Accepted: 04/08/2020] [Indexed: 02/08/2023] Open
Abstract
Empirical studies show that plant-soil feedbacks (PSF) can generate negative density dependent (NDD) recruitment capable of maintaining plant community diversity at landscape scales. However, the observation that common plants often exhibit relatively weaker NDD than rare plants at local scales is difficult to reconcile with the maintenance of overall plant diversity. We develop a spatially explicit simulation model that tracks the community dynamics of microbial mutualists, pathogens, and their plant hosts. We find that net PSF effects vary as a function of both host abundance and key microbial traits (e.g., host affinity) in ways that are compatible with both common plants exhibiting relatively weaker local NDD, while promoting overall species diversity. The model generates a series of testable predictions linking key microbial traits and the relative abundance of host species, to the strength and scale of PSF and overall plant community diversity.
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Affiliation(s)
- John W Schroeder
- Smithsonian Tropical Research Institute, Balboa Ancon, Republic of Panama.
- Department of Ecology, Evolution, and Marine Biology, University of California, Santa Barbara, Santa Barbara, CA, USA.
| | - Andrew Dobson
- Princeton University, Princeton, NJ, USA
- Santa Fe Institute, Hyde Park Road, Santa Fe, NM, USA
| | - Scott A Mangan
- Smithsonian Tropical Research Institute, Balboa Ancon, Republic of Panama
- Washington University, St. Louis, MO, USA
| | - Daniel F Petticord
- Smithsonian Tropical Research Institute, Balboa Ancon, Republic of Panama
| | - Edward Allen Herre
- Smithsonian Tropical Research Institute, Balboa Ancon, Republic of Panama
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Christian N, Sedio BE, Florez-Buitrago X, Ramírez-Camejo LA, Rojas EI, Mejía LC, Palmedo S, Rose A, Schroeder JW, Herre EA. Host affinity of endophytic fungi and the potential for reciprocal interactions involving host secondary chemistry. Am J Bot 2020; 107:219-228. [PMID: 32072625 DOI: 10.1002/ajb2.1436] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2019] [Accepted: 11/23/2019] [Indexed: 05/20/2023]
Abstract
PREMISE Interactions between fungal endophytes and their host plants present useful systems for identifying important factors affecting assembly of host-associated microbiomes. Here we investigated the role of secondary chemistry in mediating host affinity of asymptomatic foliar endophytic fungi using Psychotria spp. and Theobroma cacao (cacao) as hosts. METHODS First, we surveyed endophytic communities in Psychotria species in a natural common garden using culture-based methods. Then we compared differences in endophytic community composition with differences in foliar secondary chemistry in the same host species, determined by liquid chromatography-tandem mass spectrometry. Finally, we tested how inoculation with live and heat-killed endophytes affected the cacao chemical profile. RESULTS Despite sharing a common environment and source pool for endophyte spores, different Psychotria host species harbored strikingly different endophytic communities that reflected intrinsic differences in their leaf chemical profiles. In T. cacao, inoculation with live and heat-killed endophytes produced distinct cacao chemical profiles not found in uninoculated plants or pure fungal cultures, suggesting that endophytes, like pathogens, induce changes in secondary chemical profiles of their host plant. CONCLUSIONS Collectively our results suggest at least two potential processes: (1) Plant secondary chemistry influences assembly and composition of fungal endophytic communities, and (2) host colonization by endophytes subsequently induces changes in the host chemical landscape. We propose a series of testable predictions based on the possibility that reciprocal chemical interactions are a general property of plant-endophyte interactions.
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Affiliation(s)
- Natalie Christian
- Department of Plant Biology, School of Integrative Biology, University of Illinois, 505 S. Goodwin Ave., Urbana, IL, 61801, USA
- Department of Biology, University of Louisville, 139 Life Sciences Bldg., Louisville, KY, 40208, USA
| | - Brian E Sedio
- Smithsonian Tropical Research Institute, Unit 9100 Box 0948, DPO AA 34002-9998, USA
- Center for Biodiversity and Drug Discovery, Instituto de Investigaciones Científicas y Servicios de Alta Tecnología, Apartado 0843-01103, Ciudad del Saber, Ancón, Republic of Panama
- Department of Integrative Biology, University of Texas at Austin, 2415 Speedway #C0930, Austin, TX, 78712, USA
| | | | - Luis A Ramírez-Camejo
- Center for Biodiversity and Drug Discovery, Instituto de Investigaciones Científicas y Servicios de Alta Tecnología, Apartado 0843-01103, Ciudad del Saber, Ancón, Republic of Panama
- Department of Botany and Plant Pathology, Purdue University, 915 W. State St., West Lafayette, IN, 47907, USA
| | - Enith I Rojas
- Smithsonian Tropical Research Institute, Unit 9100 Box 0948, DPO AA 34002-9998, USA
| | - Luis C Mejía
- Center for Biodiversity and Drug Discovery, Instituto de Investigaciones Científicas y Servicios de Alta Tecnología, Apartado 0843-01103, Ciudad del Saber, Ancón, Republic of Panama
| | - Sage Palmedo
- Department of Ecology and Evolutionary Biology, Princeton University, 106A Guyot Ln., Princeton, NJ, 08544, USA
| | - Autumn Rose
- Department of Ecology and Evolutionary Biology, Princeton University, 106A Guyot Ln., Princeton, NJ, 08544, USA
| | - John W Schroeder
- Smithsonian Tropical Research Institute, Unit 9100 Box 0948, DPO AA 34002-9998, USA
- Ecology, Evolution, and Marine Biology, University of California Santa-Barbara, Noble Hall 2116, Santa Barbara, CA, 93106, USA
| | - Edward Allen Herre
- Smithsonian Tropical Research Institute, Unit 9100 Box 0948, DPO AA 34002-9998, USA
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Farioli L, Losappio LM, Schroeder JW, Preziosi D, Scibilia J, Caron L, Nichelatti M, Pastorello EA. Basal Tryptase Levels Can Predict Clinical Severity in Hymenoptera Venom Anaphylaxis and Ischemic Cardiovascular Disorders. J Investig Allergol Clin Immunol 2019; 29:162-164. [PMID: 31017123 DOI: 10.18176/jiaci.0363] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- L Farioli
- Department of Laboratory Medicine, ASST Grande Ospedale Metropolitano Niguarda, Milan, Italy
| | - L M Losappio
- Department of Allergology and Immunology, ASST Grande Ospedale Metropolitano Niguarda, Milan, Italy
| | - J W Schroeder
- Department of Allergology and Immunology, ASST Grande Ospedale Metropolitano Niguarda, Milan, Italy
| | - D Preziosi
- Department of Allergology and Immunology, ASST Grande Ospedale Metropolitano Niguarda, Milan, Italy
| | - J Scibilia
- Department of Allergology and Immunology, ASST Grande Ospedale Metropolitano Niguarda, Milan, Italy
| | - L Caron
- Department of Allergology and Immunology, ASST Grande Ospedale Metropolitano Niguarda, Milan, Italy
| | - M Nichelatti
- Biostatistics Service, ASST Grande Ospedale Metropolitano Niguarda, Milan, Italy
| | - E A Pastorello
- Department of Allergology and Immunology, ASST Grande Ospedale Metropolitano Niguarda, Milan, Italy
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Schroeder JW, Martin JT, Angulo DF, Barbosa JM, Perea R, Arias-Del Razo I, Sebastián-González E, Dirzo R. Community composition and diversity of Neotropical root-associated fungi in common and rare trees. Biotropica 2018. [DOI: 10.1111/btp.12553] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- John W. Schroeder
- Department of Biology; Stanford University; 385 Serra Mall Stanford CA 94305 USA
| | - Jessica T. Martin
- Department of Biology; Stanford University; 385 Serra Mall Stanford CA 94305 USA
| | - Diego F. Angulo
- Red de Biología Evolutiva; Instituto de Ecología AC; Carretera antigua a Coatepec 351 91070 Xalapa Veracruz Mexico
- Departamento de Ecología Tropical; Campus de Ciencias Biológicas y Agropecuarias; Universidad Autónoma de Yucatán; Apartado Postal 4-116, Itzimná 97000 Mérida Yucatán México
| | - Jomar M. Barbosa
- Department of Biology; Stanford University; 385 Serra Mall Stanford CA 94305 USA
- Department of Applied Biology; Universidad Miguel Hernández; Avda Universidad s/n Elche Alicante Spain
| | - Ramón Perea
- Department of Biology; Stanford University; 385 Serra Mall Stanford CA 94305 USA
- Departmento de Sistemas y Recursos Naturales; Universidad Politécnica de Madrid; Ciudad Universitaria s/n Madrid Spain
| | - Itzel Arias-Del Razo
- Department of Biology; Stanford University; 385 Serra Mall Stanford CA 94305 USA
- Centro Tlaxcala de Biología de la Conducta; Universidad Autónoma de Tlaxcala; Carretera Tlaxcala -Puebla Km 1.5 s/n, CP 90062 Tlaxcala Tlaxcala México
| | - Esther Sebastián-González
- Department of Biology; Stanford University; 385 Serra Mall Stanford CA 94305 USA
- Department of Applied Biology; Universidad Miguel Hernández; Avda Universidad s/n Elche Alicante Spain
| | - Rodolfo Dirzo
- Department of Biology; Stanford University; 385 Serra Mall Stanford CA 94305 USA
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Shelver WL, Smith DJ, Tell LA, Baynes RE, Schroeder JW, Riviere JE. Screening and Confirmatory Analyses of Flunixin in Tissues and Bodily Fluids after Intravenous or Intramuscular Administration to Cull Dairy Cows with or without Lipopolysaccharide Challenge. J Agric Food Chem 2016; 64:336-345. [PMID: 26695354 DOI: 10.1021/acs.jafc.5b04793] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [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: 06/05/2023]
Abstract
Twenty cull dairy cows (645 ± 83 kg) were treated with 2.2 mg/kg bw flunixin by intravenous (IV) or intramuscular (IM) administration with, or without, exposure to lipopolysaccharide in a two factor balanced design. The usefulness of screening assays to identify violative flunixin levels in a variety of easily accessible ante-mortem fluids in cattle was explored. Two animals with violative flunixin liver residue and/or violative 5-hydroxy flunixin milk residues were correctly identified by a flunixin liver ELISA screen. Oral fluid did not produce anticipated flunixin concentration profiles using ELISA determination. One cow that had liver and milk violative residues, and one cow that had a milk violation at the prescribed withdrawal period were correctly identified by flunixin milk lateral flow analyses. The ratio of urinary flunixin and 5-hydroxy flunixin may be useful for predicting disruption of metabolism caused by disease or other factors potentially leading to violative liver flunixin residues.
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Affiliation(s)
- Weilin L Shelver
- USDA-Agricultural Research Service, Biosciences Research Laboratory , 1605 Albrecht Boulevard, Fargo, North Dakota 58102, United States
| | - David J Smith
- USDA-Agricultural Research Service, Biosciences Research Laboratory , 1605 Albrecht Boulevard, Fargo, North Dakota 58102, United States
| | - Lisa A Tell
- School of Veterinary Medicine, University of California , Davis, California 95616, United States
| | - Ronald E Baynes
- College of Veterinary Medicine, North Carolina State University , Raleigh, North Carolina 27607, United States
| | - J W Schroeder
- Department of Animal Sciences, North Dakota State University , Fargo, North Dakota 58108, United States
| | - Jim E Riviere
- Department of Anatomy and Physiology, College of Veterinary Medicine, Kansas State University , Manhattan, Kansas 66506, United States
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Smith DJ, Shelver WL, Baynes RE, Tell L, Gehring R, Li M, Dutko T, Schroeder JW, Herges G, Riviere JE. Excretory, Secretory, and Tissue Residues after Label and Extra-label Administration of Flunixin Meglumine to Saline- or Lipopolysaccharide-Exposed Dairy Cows. J Agric Food Chem 2015; 63:4893-4901. [PMID: 25950946 DOI: 10.1021/acs.jafc.5b01509] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Twenty lactating dairy cattle were intravenously infused with either lipopolysaccharide (LPS) (n = 10) or sterile saline (n = 10). Five cattle in each group received three doses of flunixin meglumine administered by either intravenous infusion or intramuscular injection at 24 h intervals. Milk, urine, and tissues were collected. Thirty-six hours after the last flunixin administration, milk from six cows contained 5-hydroxyflunixin (5OHF) levels greater than the milk tolerance of 2 ng/mL; by 48 h, milk from two cows, a saline and a LPS-treated animal, had violative milk concentrations of 5OHF. A single animal treated with LPS and intramuscular flunixin contained violative flunixin residues in liver. The ratio of urinary flunixin/5OHF was correlated (P < 0.01; R(2) = 0.946) with liver flunixin residues in LPS-treated animals, but not (P = 0.96; R(2) = 0.003) in cows treated with saline in lieu of LPS. Violative residues of flunixin in dairy cattle may be related to LPS inhibition of flunixin metabolism.
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Affiliation(s)
- David J Smith
- †Biosciences Research Laboratory, USDA-ARS, 1605 Albrecht Boulevard, Fargo, North Dakota 58102, United States
| | - Weilin L Shelver
- †Biosciences Research Laboratory, USDA-ARS, 1605 Albrecht Boulevard, Fargo, North Dakota 58102, United States
| | - Ronald E Baynes
- #College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina 27607, United States
| | - Lisa Tell
- §School of Veterinary Medicine, University of California, Davis, California 95616, United States
| | - Ronette Gehring
- ⊥Institute of Computational Comparative Medicine, College of Veterinary Medicine, Kansas State University, Manhattan, Kansas 66506, United States
| | - Mengjie Li
- ⊥Institute of Computational Comparative Medicine, College of Veterinary Medicine, Kansas State University, Manhattan, Kansas 66506, United States
| | - Terry Dutko
- ΔOffice of Public Health Science, Midwestern Laboratory, USDA-FSIS, 4300 Goodfellow Boulevard, St. Louis, Missouri 63120, United States
| | - J W Schroeder
- ‡Department of Animal Sciences, North Dakota State University, P.O. Box 6050, Fargo, North Dakota 58108, United States
| | - Grant Herges
- †Biosciences Research Laboratory, USDA-ARS, 1605 Albrecht Boulevard, Fargo, North Dakota 58102, United States
| | - Jim E Riviere
- ⊥Institute of Computational Comparative Medicine, College of Veterinary Medicine, Kansas State University, Manhattan, Kansas 66506, United States
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Pastorello EA, Schroeder JW, Veronese SM, Pravettoni V, De Gasperi A, Cantoni S, Losappio L, Farioli L, Qualizza R, Scarpati B, Mascheri A, Scibilia J. Two cases of elevated tryptase in abdominal aortic aneurysm. Eur Ann Allergy Clin Immunol 2015; 47:58-61. [PMID: 25781196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
INTRODUCTION From the literature, patients with a history of anaphylaxis to hymenoptera venom and positive specific IgE have shown a correlation between elevated tryptase levels and two clinical situations: systemic mastocytosis and an increased risk of reactions to venom immunotherapy or hymenoptera sting. Other clinical scenarios could explain elevated tryptase levels. MATERIAL AND METHODS A 67 year old male (P1) and a 77 year old male (P2) were evaluated for previous severe anaphylaxis to hymenoptera sting. They underwent standard diagnostic work-up for hymenoptera venom allergy. Having found elevated tryptase levels, these were followed by a bone marrow biopsy to rule out systemic mastocytosis. RESULTS P1: specific IgE and skin tests were positive for Vespula species; tryptase 52.8 ng/ml; P2: specific IgE and skin tests were positive for Vespa cabro and tryptase 153 ng/ml. Bone marrow biopsy results were negative for mastocytosis. We carried out magnetic resonance imaging, in P1 to better characterize the severe osteoporosis and in P2 because during physical examination a pulsating mass had been identified in the mesogastrium, and an aneurysm of the abdominal aorta which required surgical intervention in both patients was detected. Eight months after surgery, tryptase levels had diminished significantly (P1: 11.6 ng/ml and P2: 14.5 ng/ml). DISCUSSION The elevated tryptase levels were correlated to abdominal aneurysm in both patients. In fact, post-surgery tryptase levels dramatically decreased. These two cases demonstrate that high tryptase levels in subjects with a history of hymenoptera venom anaphylaxis can be associated to undiagnosed aneurysmatic disease.
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Affiliation(s)
- E A Pastorello
- Department of Allergology and Immunology, Niguarda Ca' Granda Hospital, Piazza Ospedale Maggiore 3, Milan 20162, Italy. Phone: +39 02 6444 27 51 Fax: +39 02 6444 20 82 E-mail:
| | - J W Schroeder
- Department of Allergology and Immunology, Niguarda Ca' Granda Hospital, Milan, Italy
| | - S M Veronese
- Department of Anatomy Histology and Cytogenetics, Niguarda Ca' Granda Hospital, Milan, Italy
| | - V Pravettoni
- Clinical Allergy and Immunology Unit, Fondazione IRCCS Cà Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - A De Gasperi
- Department of Anaesthesia and Intensive Care, Niguarda Ca' Granda Hospital, Milan, Italy
| | - S Cantoni
- Department of Hematology, Niguarda Ca' Granda Hospital, Milan, Italy
| | - L Losappio
- Department of Allergology and Immunology, Niguarda Ca' Granda Hospital, Milan, Italy
| | - L Farioli
- Department of Laboratory Medicine, Niguarda Ca' Granda Hospital, Milan, Italy
| | - R Qualizza
- Department of Allergology and Immunology, Niguarda Ca' Granda Hospital, Milan, Italy
| | - B Scarpati
- Department of Immunohematology and Transfusion Medicine, Niguarda Ca' Granda Hospital, Milan, Italy
| | - A Mascheri
- Department of Allergology and Immunology, Niguarda Ca' Granda Hospital, Milan, Italy
| | - J Scibilia
- Department of Allergology and Immunology, Niguarda Ca' Granda Hospital, Milan, Italy
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Schroeder JW, Tran HT, Dick CW. Fine scale spatial genetic structure in Pouteria reticulata (Engl.) Eyma (Sapotaceae), a dioecious, vertebrate dispersed tropical rain forest tree species. Glob Ecol Conserv 2014. [DOI: 10.1016/j.gecco.2014.07.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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10
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Schroeder JW, Bauer ML, Bork NR. Effect of flaxseed physical form on digestibility of lactation diets fed to Holstein steers. J Dairy Sci 2014; 97:5718-28. [PMID: 24952769 DOI: 10.3168/jds.2014-7911] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [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: 01/06/2014] [Accepted: 05/18/2014] [Indexed: 11/19/2022]
Abstract
Four multicannulated (rumen, duodenum, and ileum) Holstein steers (459.7±46.4kg of initial body weight) were used in a 4×4 Latin square design to determine the effect of flaxseed processing method on ruminal fermentation and digestibility. Treatments were based on inclusion of (1) 7.5% linseed meal (control), (2) 10% whole flaxseed, (3) 10% rolled flaxseed, or (4) 10% ground flaxseed on a dry matter (DM) basis, and were formulated to mimic typical high-producing dairy cow lactation diets. The control diet contained linseed meal in a proportion to provide crude protein (CP) equal to the amount of CP contributed by the flaxseed in the other treatments. Diets were fed for ad libitum intake and contained 30% corn silage, 17% chopped alfalfa hay, 6% sugar beet pulp, and 47% concentrate (comprising ground corn, supplemental protein, trace minerals and vitamins, and either flaxseed or linseed meal (DM basis). Diets were formulated to contain 17% CP, 34% neutral detergent fiber, 21% acid detergent fiber, and 4% fatty acid (DM basis). Periods were 14 d long and consisted of 7 d of adaptation and 7 d of sample collection. Dry matter intake (as a % of body weight) was similar (2.41±0.17) for all treatments. The inclusion of flaxseed, regardless of processing method, tended to decrease total-tract organic matter digestibility relative to the linseed control, but no differences in CP intake, duodenal CP flow (bacterial, apparent feed, or total), ileal CP flow, fecal CP output, microbial efficiency, or CP digestibility (apparent ruminal, true ruminal, small intestine, large intestine, or total tract) were observed between treatments. Method of processing did not alter ruminal pH, ammonia, or volatile fatty acids production. The ground flaxseed treatment had the fastest rate of in situ DM degradation (11.25%/h), followed by the control (7.46%/h), rolled flaxseed (4.53%/h), and whole flaxseed (0.57%/h) treatments. Degradability of CP and fat followed the same pattern as DM degradability for processed flaxseed. In situ degradation rates of alfalfa hay neutral detergent fiber and acid detergent fiber tended to be fastest for the ground flaxseed treatment. Taken together, the digestibility, fermentation, and in situ data indicate that rolling and grinding are both acceptable methods of processing flaxseed. The in situ data strongly support the need for processing flaxseed before inclusion in lactation diets.
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Affiliation(s)
- J W Schroeder
- Department of Animal Sciences, North Dakota State University, Fargo 58108.
| | - M L Bauer
- Department of Animal Sciences, North Dakota State University, Fargo 58108
| | - N R Bork
- Standard Nutrition Services, Luverne, MN 56156
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Abstract
The objective was to evaluate the effects of feeding ground canola seed on the fatty acid profile, yield, and composition of milk from dairy cows. Twenty-four multiparous Holstein cows (548.3 +/- 11.9 kg body weight and 28 +/- 9 d in lactation) were randomly assigned to 1 of 2 treatments: Control (CON) or ground canola seed treatment (GCS) with 14% [of diet dry matter (DM)] of the total ration as ground canola seed containing 34% lipid. Diets contained 20% crude protein, but varied in net energy as a result of fat content differences of 2.5% and 6.4% (DM) for CON and GCS, respectively. Diets were composed of corn, corn silage, alfalfa (50:50 ground hay and haylage, DM basis), soybean and blood meal, and vitamins and minerals. Mechanically extruded canola meal was used in the CON diet to adjust for the protein from canola seed in the GCS diet. Cows were housed in tie-stalls and fed and milked twice daily for 10 wk. The inclusion of ground canola seed did not alter DM intake, weight gain, or body condition score of cows. Milk fat from GCS cows had greater proportions of long-chain fatty acids (> or = 18 carbons) and a lower ratio of n-6 to n-3 fatty acids. Feeding GCS reduced the proportion of short- and medium-chain fatty acids. Milk fat from cows fed GCS had a greater proportion of vaccenic acid and tended to have a higher proportion of cis-9,trans-11 conjugated linoleic acid. Actual and 3.5% fat-corrected milk yields were similar between treatments. The milk fat and protein percentages were lower for GCS cows, but total yield of these components was similar between treatments. Milk urea nitrogen was lower and serum urea nitrogen tended to be lower in cows fed canola seed. Serum glucose, insulin, and nonesterified fatty acids were not altered, but serum triglycerides were higher in GCS cows. Ammonia and total volatile fatty acids tended to be lower in ruminal fluid from GCS cows; rumen pH was unchanged. Feeding canola seed to lactating dairy cows resulted in milk fat with higher proportions of healthful fatty acids without affecting milk yield or composition of milk.
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Affiliation(s)
- M W Chichlowski
- Department of Animal and Range Sciences, North Dakota State University, Fargo, 58105, USA
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Abstract
Twenty-four multiparous Holstein cows averaging 566 +/- 43 kg of body weight and 83 +/- 49 d in lactation were assigned to treatments stratified by age, days in milk, and milk yield to evaluate the effects of feeding increasing levels of wet corn gluten feed (WCGF) on lactational performance and milk composition. Complete diets containing 0, 15, 30, or 45% of the total ration dry matter (DM) as WCGF were formulated to be 17.2% crude protein and 1.72 Mcal of NE(L) per kilogram of DM, and fed twice daily to individual cows in Calan gates for 15 wk. All diets had a positive metabolizable protein balance. WCGF did not alter DM intake, but feed intake variance tended to be more consistent among cows fed 15 and 30% WCGF (DM basis). Weight gain was numerically greatest for those cows receiving 45% WCGF. Efficiency of energy and protein utilization was not different among treatments. Milk components of fat, protein, and casein were not different among treatments. Milk urea nitrogen was greater for cows on WCGF. Serum urea nitrogen was greatest in cows fed diets containing 15 and 45% WCGF. Serum insulin was lowest in the groups receiving 30 and 45% WCGF, but serum glucose and total protein were unaffected. The concentration of the ruminal volatile fatty acid, valerate, was greater in cows on the WCGF diet and highest in cows fed 30% WCGF. Ruminal ammonia was greatest in cows receiving 30% WCGF. It was estimated that 18.6% of the dietary DM fed as WCGF as a replacement for both portions of the concentrate and the forage in similar diets would have maximized milk yield without negatively affecting milk composition or feed efficiency.
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Affiliation(s)
- J W Schroeder
- Department of Animal and Range Sciences, North Dakota State University, Fargo 58105-5053, USA.
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Gabram SG, Hoenig J, Schroeder JW, Mansour A, Gamelli R. What are the primary concerns of recently graduated surgeons and how do they differ from those of the residency training years? Arch Surg 2001; 136:1109-14. [PMID: 11585500 DOI: 10.1001/archsurg.136.10.1109] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
HYPOTHESIS Graduated surgeons have differences in concerns when comparisons are made between fellows and practicing surgeons, practicing surgeons and residents, and male and female surgeons. DESIGN AND SETTING A survey was distributed to surgeons who graduated from 17 New England residency programs from 1993 to 1996, consisting of 9 demographic questions and 33 items coded on a Likert-type scale (with scores from 1 [least concerning] to 5 [most concerning]). PARTICIPANTS Surgical fellows and practicing surgeons recently graduated from general surgical residency programs in New England who had participated in a previous study as residents. INTERVENTION Distribution and completion of the survey. MAIN OUTCOME MEASURE Personal and career-oriented concerns of recently graduated surgical residents. RESULTS Personal issues continue to rank high for graduated residents, but the areas of greatest concern became more financially and career oriented. The top concerns of fellows were personal finances (mean score, 3.2), child rearing (mean score, 3.1), salary (mean score, 3.1), postponing family plans (mean score, 3.0), availability of role models (mean score, 2.9), and number of work hours (mean score, 2.8). The top concerns of practicing surgeons were salary (mean score, 3.2), personal finances (mean score, 3.1), number of referrals (mean score, 3.0), support for research (mean score, 2.7), child rearing (mean score, 2.7), and availability of role models (mean score, 2.7). Differences existed between men and women for child rearing, initiating personal relationships, maintaining personal relationships, maternity leave, and promotional advancement. Women were more concerned than men. CONCLUSIONS Assistance with career planning and job selection during the residency years should be enhanced to diminish the concerns about financial issues and the availability of role models after graduation. Many of the concerns among male and female graduates are still reflective of larger societal expectations, but some, such as promotional advancement, may be attenuated through guidance and mentoring of residents before job selection.
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Affiliation(s)
- S G Gabram
- Department of Surgery, Loyola University Medical Center, 2160 S First Ave, Maywood, IL 60153, USA.
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Affiliation(s)
- J W Schroeder
- Texas A & M University, Faculty of Genetics and Department of Wildlife & Fisheries Sciences, 2258 TAMUS, College Station, Texas 77843-2258, USA
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Mann BJ, Dodson JM, Schroeder JW, Lockhart LA, Leo B, Clark CG. Structure and function of the galactose/N-acetyl D-galactosamine inhibitable adhesin of Entamoeba dispar. Arch Med Res 1997; 28 Spec No:168-9. [PMID: 9033057] [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] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- B J Mann
- Department of Internal Medicine, University of Virginia Health Sciences Center, Charlottesville 22908, USA
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