| Effects of DL-malate on in vitro forage fiber digestion by mixed ruminal microorganisms. | |
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MedLine Citation:
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PMID: 15018099 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The objective of this study was to evaluate the effects of 0, 4, 8, and 12 mM DL-malate on the in vitro mixed ruminal microorganism fermentation of alfalfa hay and Coastal bermudagrass hay. When alfalfa hay was the substrate, 4 and 8 mM DL-malate numerically increased propionate concentration, and 12 mM DL-malate increased (P < 0.10) propionate. All three concentrations of DL-malate decreased (P < 0.05) the acetate:propionate ratio. In Coastal bermudagrass hay fermentations, all three DL-malate concentrations increased (P < 0.05) propionate and decreased (P < 0.05) the acetate:propionate ratio, while 4 and 12 mM DL-malate numerically increased in vitro dry matter disappearance. When mixed ruminal microorganisms were incubated with 6.25 mM DL-lactic acid and alfalfa hay, 8 and 12 mM DL-malate increased (P < 0.05) final pH, and 12 mM DL-malate increased (P < 0.10) propionate and decreased (P < 0.10) the acetate:propionate ratio. DL-Malate treatment had little effect on in vitro dry matter disappearance. Addition of 8 and 12 mM DL-malate to Coastal bermudagrass hay plus DL-lactic acid fermentations increased (P < 0.05) final pH, and 8 mM DL-malate increased (P < 0.10) in vitro dry matter disappearance. Even though DL-malate treatment consistently increased final pH values in fermentations that included DL-lactic acid, there was not a corresponding increase in in vitro dry matter disappearance of either alfalfa hay or Coastal bermudagrass hay in the 48-h batch culture incubations. |
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Authors:
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Scott A Martin |
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Publication Detail:
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Type: In Vitro; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Current microbiology Volume: 48 ISSN: 0343-8651 ISO Abbreviation: Curr. Microbiol. Publication Date: 2004 Jan |
Date Detail:
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Created Date: 2004-03-15 Completed Date: 2004-05-04 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 7808448 Medline TA: Curr Microbiol Country: United States |
Other Details:
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Languages: eng Pagination: 27-31 Citation Subset: IM |
Affiliation:
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Department of Animal and Dairy Science, 312 Rhodes Center for Animal and Dairy Science, The University of Georgia, Athens, GA 30602-2771, USA. scottm@uga.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Cattle / metabolism*, microbiology Cynodon / metabolism Dietary Fiber / metabolism* Fatty Acids, Volatile / metabolism Fermentation Hydrogen / metabolism Hydrogen-Ion Concentration Lactic Acid / metabolism, pharmacology Malates / metabolism, pharmacology* Male Medicago sativa / metabolism Methane / metabolism Rumen / drug effects, metabolism*, microbiology Selenomonas / drug effects, metabolism* |
| Chemical | |
Reg. No./Substance:
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0/Fatty Acids, Volatile; 0/Malates; 1333-74-0/Hydrogen; 50-21-5/Lactic Acid; 6915-15-7/malic acid; 74-82-8/Methane |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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