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Methionine and lysine are the two amino acids most often implicated as being present in insufficient amounts to optimise milk protein output, and in particular milk protein content (Rulquin, 1992, INRA Prod Anim, 5(1), 29-36). Brunschwig et al (1994, Ann Zootech, 43, suppl 1, 60s) observed an increase in milk protein content of + 1.5 g/kg in early lactation cows fed a maize silage based ration formulated to be optimal in digestible lysine (LysDl) content (% PDIE) supplemented with 12 g of rumen protected methionine (Smartamine T"" M). The aim of this study was to investigate if the energy value of the maize silage fed or the substitution of part of the total forage by grass silage influenced the response to 12 g of Smartamine T"" M.

Supplementation of maize silage or mixed forage (maize and grass silage) based rations with rumen protected methionine for dairy cows