WHEAT STRAW OR ALFALFA HAY IN DIETS WITH 30-PERCENT NEUTRAL DETERGENT FIBER FOR LACTATING HOLSTEIN COWS

被引:57
作者
POORE, MH [1 ]
MOORE, JA [1 ]
SWINGLE, RS [1 ]
ECK, TP [1 ]
BROWN, WH [1 ]
机构
[1] UNIV ARIZONA,DEPT ANIM SCI,TUCSON,AZ 85721
关键词
WHEAT STRAW; ALFALFA HAY; FIBER;
D O I
10.3168/jds.S0022-0302(91)78500-7
中图分类号
S8 [畜牧、 动物医学、狩猎、蚕、蜂];
学科分类号
0905 ;
摘要
Twenty-four Holstein cows near peak lactation were fed diets formulated to contain 30% NDF with forage NDF from chopped wheat straw or chopped alfalfa hay in proportions of 0:3, 1:2, 2:1, and 3:0 in an 8-wk trial to evaluate effects of fiber source on lactational performance. Concentrate was based on highly degradable carbohydrate in steam-flaked sorghum grain. Forage to concentrate ratio decreased from 49:51 to 28:72 when straw was substituted for alfalfa hay. Milk yield (38.4 kg/d) and DMI (23.1 kg/d) were not influenced by forage source. Milk fat percentage decreased and milk protein percentage increased linearly with increasing straw. Yields of 3.5% FCM and fat showed linear and quadratic responses, because they appeared to be reduced only on the 0:3 diet, and protein yield showed a quadratic response and was highest for the 1:2 diet. Digestibility of NDF averaged 43.5, 45.4, 40.7, and 31.2%, and acetate to propionate ratio was 3.0, 2.4, 2.2, and 1.9 with increasing dietary straw. Passage rates were not influenced by diet and averaged 9.3, 7.6, 6.1, and 4.7%/h for fluid, grain, alfalfa hay, and wheat straw, respectively. It is suggested that the ratio of forage NDF to ruminally degradable starch be maintained greater-than-or-equal-to 1:1 when diets based on low quality forage are fed to cows in early lactation.
引用
收藏
页码:3152 / 3159
页数:8
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