Integration of ruminal metabolism in dairy cattle

Journal of Dairy Science
J L FirkinsN R St-Pierre

Abstract

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 a...Continue Reading

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Citations

Nov 2, 2014·Applied Microbiology and Biotechnology·Vilas PatelChaitanya G Joshi
Jun 2, 2015·Frontiers in Microbiology·Timothy J Hackmann, Jeffrey L Firkins
Jul 28, 2016·Journal of Dairy Science·Yairanex Roman-GarciaJeffrey L Firkins
May 25, 2011·Journal of Dairy Science·M L EastridgeJ L Firkins
Apr 1, 2008·Animal : an International Journal of Animal Bioscience·B A RøjenN B Kristensen
Mar 21, 2009·Amino Acids·Guoyao Wu
Jan 25, 2011·Journal of Dairy Science·E R CarvalhoS S Donkin

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