Document Detail

Integration of ruminal metabolism in dairy cattle.
MedLine Citation:
PMID:  16527876     Owner:  NLM     Status:  MEDLINE    
An important objective is to identify nutrients or dietary factors that are most critical for advancing our knowledge of, and improving our ability to predict, milk protein production. The Dairy NRC (2001) model is sensitive to prediction of microbial protein synthesis, which is among the most important component of models integrating requirement and corresponding supply of metabolizable protein or amino acids. There are a variety of important considerations when assessing appropriate use of microbial marker methodology. Statistical formulas and examples are included to document and explain limitations in using a calibration equation from a source publication to predict duodenal flow of purine bases from measured urinary purine derivatives in a future study, and an improved approach was derived. Sources of specific carbohydrate rumen-degraded protein components probably explain microbial interactions and differences among studies. Changes in microbial populations might explain the variation in ruminal outflow of biohydrogenation intermediates that modify milk fat secretion. Finally, microbial protein synthesis can be better integrated with the production of volatile fatty acids, which do not necessarily reflect volatile fatty acid molar proportions in the rumen. The gut and splanchnic tissues metabolize varying amounts of volatile fatty acids, and propionate has important hormonal responses influencing milk protein percentage. Integration of ruminal metabolism with that in the mammary and peripheral tissues can be improved to increase the efficiency of conversion of dietary nutrients into milk components for more efficient milk production with decreased environmental impact.
J L Firkins; A N Hristov; M B Hall; G A Varga; N R St-Pierre
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.; Review    
Journal Detail:
Title:  Journal of dairy science     Volume:  89 Suppl 1     ISSN:  1525-3198     ISO Abbreviation:  J. Dairy Sci.     Publication Date:  2006 Mar 
Date Detail:
Created Date:  2006-03-10     Completed Date:  2006-03-28     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  2985126R     Medline TA:  J Dairy Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  E31-51     Citation Subset:  IM    
Department of Animal Sciences, The Ohio State University, Columbus 43210, USA.
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MeSH Terms
Bacteria / metabolism
Bacterial Proteins / metabolism
Cattle / metabolism*
Duodenum / metabolism
Eukaryota / metabolism
Fatty Acids, Volatile / chemistry,  metabolism
Milk Proteins / biosynthesis
Models, Biological*
Nitrogen / metabolism
Omasum / metabolism,  microbiology,  parasitology
Purines / metabolism,  urine
Rumen / metabolism*
Reg. No./Substance:
0/Bacterial Proteins; 0/Fatty Acids, Volatile; 0/Milk Proteins; 0/Purines; 7727-37-9/Nitrogen

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