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Journal of Dairy Science Vol. 80 No. 4 722-729
© 1997 by American Dairy Science Association ®
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Lactational Performance of Cows Fed Low or High Ruminally Undegradable Protein Prepartum and Supplemental Methionine and Lysine Postpartum

Z. Wu 1, R. J. Fisher 1, C. E. Polan 1, and C. G. Schwab 2

1 Department of Dairy Science, Virginia Agricultural Experiment Station, Virginia Polytechnic Institute and State University, Blacksburg 24061-0315
2 Department of Animal and Nutritional Sciences, University of New Hampshire, Durham 03824

Multiparous Holstein cows (n = 24) were fed diets containing 34 or 41% ruminally undegradable protein (RUP) for 30 d before parturition; then each group was fed a basal diet supplemented with or without ruminally stable Met (10.6 g/d) and Lys (15.2 g/d) for 75 d in the subsequent lactation. Supplementation of Met and Lys increased the milk yield of cows previously fed the low RUP diet, but milk yields before and after amino acid (AA) supplementation were similar for cows previously fed the high RUP diet. Milk protein content (percentage) increased from 2.83 to 2.96 for cows previously fed the high RUP diet. Milk protein yield increased from 1.13 to 1.21 kg/d when Met and Lys were fed. Data on AA concentration in plasma and AA extraction by the mammary gland suggest that the supplementation of Met and Lys corrected a Met limitation.

According to the Cornell Net Carbohydrate and Protein System, the lactation diet was limiting for Met for maximum milk yield and was corrected by AA supplementation. Based on limiting AA, allowable milk yield was 42.5 kg/d, and the observed yield was 40.9 kg/d averaged across treatments. The group with the greatest allowable milk yield (45.2 kg/d) had the greatest actual milk yield (43.0 kg/d). The regression equation of observed milk yield on allowable milk yield was Y = 3.4 + 0.8805X.

Key Words: amino acids • protein degradability • lactation • dry cow nutrition

Submitted on November 6, 1995
Accepted on May 17, 1996




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Copyright © 1997 by the American Dairy Science Association ®.