摘要
为缓解奶牛热应激对其生产性能造成的影响,降低由此带来的经济损失,该试验研究、配制了奶牛抗热应激功能性营养包。按照胎次、产奶量、泌乳天数和体况相近的原则,将120头健康的荷斯坦泌乳奶牛随机分成试验组和对照组。在中度热应激条件下,对照组奶牛饲喂牧场基础日粮,试验组奶牛在基础日粮中添加300 g/(d·头)复合型功能性营养包,观察复合型功能性营养包的抗热应激效果。试验结果表明,在正试结束时,试验组奶牛的单产显著高于对照组(P<0.05);与预试期相比,对照组奶牛的平均单产降低2.96 kg/(d·头),而试验组平均单产降低1.16 kg/(d·头),比对照组缓降了1.80 kg/(d·头);试验组奶牛的乳蛋白涨幅比对照组高0.13个百分点;正试结束时和停试第10天试验组奶牛的乳脂率和乳中干物质均显著高于对照组(P<0.05);试验组奶牛的饲料转化率比对照组缓降0.02。结果提示,抗热应激功能性营养包不仅能够有效地缓减牛奶由于热应激导致的单产下降,还可以提高乳蛋白率、乳脂率、乳中干物质和饲料转化率。
In order to alleviate the effects of heat stress on the production performance of dairy cows and reduce the economic loss, the functional nutrition package against heat stress in dairy cows was prepared. One hundred and twenty healthy Holstein lactating cows were randomly divided into experimental group and control group according to the principles of similar parity, milk yield, lactating days and body condition. Under the conditions of moderate heat stress, the dairy cows in control group were fed with the basal diet, and the dairy cows in experiment group were fed with the basal diet with adding 300 g/（d· head）composite functional nutrition package. The anti-heat stress effects of composite functional nutrition package were observed. The results showed that the unit yield of dairy cows in test group was significantly higher than that in control group （P〈0.05） at the end of the test. Compared with pre-trail period, the average unit yield of dairy cows in control group reduced 2.96 kg/（d, head）and that in test group reduced 1.16 kg/（d· head）. The reduction of unit yield in test group was 1.80 kg/（d· head）lower than that in control group. The increasing amplitude of milk protein in test group was 0.13 percentage points higher than that in control group. The milk fat percentage and dry matter content in test group at the end of the test and on the 10-th day after the test were significantly higher than that in control group （P〈0.05）. The reduction of the feed conversion rate of dairy cows in test group was 0.02 lower than that in control group. The results suggested that functional nutrition package against heat stress could not only alleviate the reduction of milk yield caused by heat stress, but it could also enhance the milk protein content, milk fat percentage, dry matter content and feed conversion rate.
出处
《畜牧与饲料科学》
2014年第11期13-16,共4页
Animal Husbandry and Feed Science
基金
现代农业(奶牛)产业技术体系(CARS-37)
关键词
奶牛
抗热应激
营养包
开发
dairy cows
anti-heat stress
nutrition package
development
