Influence of source and amount of dietary protein on milk yield by cows in early lactation

被引:69
作者
Cunningham, KD [1 ]
Cecava, MJ [1 ]
Johnson, TR [1 ]
Ludden, PA [1 ]
机构
[1] PURDUE UNIV,DEPT ANIM SCI,W LAFAYETTE,IN 47907
关键词
soybean meal; amino acid now; dairy cow;
D O I
10.3168/jds.S0022-0302(96)76407-X
中图分类号
S8 [畜牧、 动物医学、狩猎、蚕、蜂];
学科分类号
0905 ;
摘要
The purpose of this research was to examine the effects of various amounts of CP and RUP on AA flow to the small. intestine and milk yield of lactating dairy cows. The first trial was a 5 x 5 Latin square design using five ruminally and duodenally cannulated multiparous cows. Diets contained chopped alfalfa hay, corn silage, high moisture corn, solvent-extracted soybean meal, and specially processed soybean meal (60.2% RUP). Soybean meal replaced high moisture corn to increase dietary CP from 14.5 to 16.5 or 18.5%, and specially processed soybean meal replaced solvent-extracted soybean meal in diets containing 16.5 or 18.5% CP to provide 6.2, 7.3, 6.7, and 8.3% RUP. Increasing dietary CP increased the flows of all AA. to the duodenum. Increasing dietary RUP increased flows of Arg, His, Lys, Phe, Asp, and Glu to the duodenum. In a second trial, 36 cows were fed diets similar to those used in trial 1. Increased amounts of RUP in diets tended to increase milk yield because of improved protein status, improved intake of metabolizable energy, or both.
引用
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页码:620 / 630
页数:11
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