动物营养学报Issue(6)：1477-1485,9.DOI:10.3969/j.issn.1006-267x.2014.06.007
饲粮代谢葡萄糖水平对热应激奶牛生产性能和生理指标的影响
Dietary Metabolizable Glucose Level Affects Performance and Physiological Indices of Dairy Cows under Heat Stress
摘要
Abstract
This experiment was conducted to study the effects of dietary metabolizable glucose(MG)level on performance and physiological indices of dairy cows under heat stress. Sixteen healthy Holstein cows with simi-lar parity,days in lactation,milk yield and body weight were randomly divided into four groups with four cows in each group. Cows in test groups 1 to 4 were fed experimental diets containing 121.31,109.70,99.27 and 89.55 g / kg MG,respectively. The experiment lasted for 42 days,including a 14-day pre-experiment peri-od and a 28-day experiment period. The results showed as follows:rectal temperature and respiratory rate of dairy cows(the means during whole period)reached the lowest in test groups 2 and 3,respectively,and were both significantly lower than those in the other groups(P<0.05). At different time point,feed intake and milk yield of dairy cows in test group 3 were all higher than those of the other groups,and the means during whole period were significantly higher than those in the other groups( P <0.05). Milk fat,milk protein,milk dry matter milk percentages(the means during whole period)in test group 3 were significantly higher than those in the other groups(P<0.05),and lactose percentage in test group 1 was significantly higher than that in the oth-er groups(P<0.05). In conclusion,the change of dietary MG level can affect performance and physiological indices of dairy cows under heat stress;under conditions in the present study,the optimal level is 99.27 g / kg, which can improve feed intake and milk yield.关键词
热应激/奶牛/代谢葡萄糖Key words
heat stress/dairy cow/metabolizable glucose分类
农业科技引用本文复制引用
宋良荣,薛白,闫方权,闫天海,肖俊..饲粮代谢葡萄糖水平对热应激奶牛生产性能和生理指标的影响[J].动物营养学报,2014,(6):1477-1485,9.基金项目
国家科技支撑计划 （）
