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Article: Effects of providing two forms of supplemental methionine to periparturient Holstein dairy cows on feed intake and lactational performance1
- 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
Eighteen primiparous and 42 multiparous Holstein cows were blocked according to parity and expected calving date and assigned randomly to 1 of 3 dietary treatments: 1) a basal diet (negative control), 2) the basal diet plus 2-hydroxy-4-methylthio butanoic acid isopropyl ester (MetaSmart, Adisseo Inc., Antony, France), or 3) the basal diet plus rumen-protected Met (Smartamine M, Adisseo Inc., Alpharetta, GA). Treatments were initiated 21 d before expected calving and continued through 140 d postpartum. Diets were similar in ingrethent and chemical composition, except for the content of Met in metabolizable protein. MetaSmart [0.35% prepartum and 0.54% postpartum in diet dry matter ...