Factors affecting body tissue mobilization in early lactation dairy cows. 1. Effect of dietary protein on mobilization of body fat and protein.

摘要: Twenty Holstein cows were fed diets that formulated with 16 or 19% crude protein (CP) contained, respectively, 6 and 9% ruminally undegradable (RUP) (dry matter basis) to study the effect of increased RUP on tissue mobilization production parameters. Cows enrolled in from -14 114 d postpartum. Body composition measurements using D2O dilution technique made at -2, 5, 12 wk Maximum loss body occurred between 2 prepartum 5 postpartum during which time both treatments mobilized a mean 54 kg fat 21 protein. continued mobilize 18 through postpartum, but amount was unchanged. One unit change condition score corresponded about 40 empty fat. Partitioning energy indicated that, for each energy, 93% lost gained as fat, accounted only 7%. Increasing diet had no amounts protein, energy. Milk 39.8 16% CP 42.4 diet. There an interaction treatment by week Both dry intake milk lower first greater thereafter than percentage higher (3.08% vs. 2.89%), yield tended be (1.29 1.15 kg/d),