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Production Responses of Dairy Cows Fed Various Amounts of Rumen-Protected Methionine and Lysine

1989; Elsevier BV; Volume: 72; Issue: 7 Linguagem: Inglês

10.3168/jds.s0022-0302(89)79297-3

1529-9066

John A. Rogers, S.B. Peirce-Sandner, Andreas M. Papas, C.E. Polan, C.J. Sniffen, T.V. Muscato, C.R. Staples, J.H. Clark,

Ruminant Nutrition and Digestive Physiology

A 3 x 3 factorial response surface design was used to study the effects of feeding rumen-protected methionine and lysine to dairy cows between 22 and 305 d of lactation.A total of 130 dairy cows at three universities were individually fed a corn silage and corn grain-based diet that contained either soybean meal or corn gluten meal and urea.An unsupplemerited control diet plus nine treatment combinations of three amounts of rumenprotected DL-methionine (3.4, 7. 8, and 12.2 g/d) and three amounts of rumenprotected L-lysine (5.9, 13.5, and 21.1 g/ d) were fed at all locations.Plasma concentrations of methionine and lysine were increased when rumen-protected methionine and lysine were supplemented to the diets.Rumen-protected methionine and lysine did not affect feed intake by cows fed either the soybean meal or corn glu-