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Effects of the supplementation with coated methionine on performance of dairy cows.

L. R. Royo

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06-24-2020

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Abstract:

W121
Effects of the supplementation with coated methionine on performance of dairy cows.
L. R. Royo*, M. Puyalto, J. J. Mallo. Norel SA Madrid, Spain.

Effects of the supplementation with coated methionine on performance of dairy cows Two studies were carried out in commercial dairy farms with the aim to evaluate the effects of supplementing Methionine (Met) coated with palm stearin, on milk yield and composition. In the farm A, 160 Holstein cows (days in milk 171 � 106, milk yield 36.3 � 8.2 kg/d), and in the farm B, 93 Holstein cows (days in milk 181 � 143, milk yield 38.9 � 11.6 kg/d) were split in 2 homogeneous groups. In both farms, cows were exposed for 60 d to 2 treatments following a complete randomized design. Treatments consisted in a control (CT) group that received a basal diet (farm A: 20.1% CP, 30.5% NDF, 1.4 Mcal NEl/kg; farm B: 21.6% CP, 36.5% NDF, 1.1 Mcal NEl/kg; DM basis), and a Met supplemented group (BM) that received the same diets with less crude protein (CP; farm A: 18.4%; farm B: 21%) plus 40 g/d of coated Met (39% Met; providing 16 g of Met/d), commercialized as Bymet by Norel. In both farms the protein concentrate used were soy and rapeseed meal, the decrease in the CP content was set to show the economic benefits of reducing the CP. Cows were fed the ration twice daily. Milk yield was determined daily and milk composition (fat and protein) weekly. Data were summarized and analyzed using a mixed-effects model for repeated measures. In farm A, milk yield was affected (P = 0.003) by an interaction between treatment and week, BM cows produced greater amounts of milk during the whole study (36.8 kg/d), except in the wk 4, comparing with CT group (36.0 kg/d). In farm B, milk yield tended (P = 0.110) to be affected by the interaction between treatment and week, BM cows produced 39.8 kg/d and CT cows, 37.8 kg/d. Interactions between treatment and week were observed (P = 0.01 in farm A and B) for fat content, it was similar in both groups in farm A, but was higher in BM cows in farm B. Protein content was affected by an interaction between treatment and week (P = 0.04 in farm A and B), it was similar in both groups in farm A, but it tended to be lower in BM cows in farm B. It is concluded that Met coated with palm stearin can improve milk yield of cows fed a TMR with high levels of CP.

Keywords: methionine, milk, rumen.