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Article: Meta-analysis of milk protein yield responses to lysine and methionine supplementation
- Article from:
- Journal of Dairy Science
- Article date:
- October 1, 2009
- Author:
CopyrightCopyright American Dairy Science Association Oct 2009. Provided by ProQuest LLC. (Hide copyright information)
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ABSTRACT
Previous reports on milk protein responses to AA supplementation focused on Lys and Met concentrations expressed as a percentage of metabolizable protein, not the amounts of AA supplied. The objective of this study was to quantify the milk protein yield (MPY; g/d) response in studies in which Met or Lys was supplied either by postruminal infusion or in a rumen-protected form. A meta-analysis using a logistic regression model fitted using nonlinear mixed model procedures was performed on results from 23 published studies involving postruminal supplementation of Lys (18 experiments) and Met (35 experiments) in lactating dairy cows. Variance caused by study effect was removed by ...
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