摘要
选择2-3胎次泌乳中后期（180d）且产奶量相近的荷斯坦奶牛10头随机分为两组,饲喂相同基础日粮,试验组在基础日粮中添加CT2000,饲喂标准为30g/日.牛。结果显示：（1）两组奶牛产奶量均与牛舍日平均湿热指数（THI）和最高温度呈负相关（P〈0.01）;（2）饲喂CT2000前,试验组受高温影响产奶量下降率极显著高于对照组（P〈0.01）;饲喂CT2000期间,试验组产奶量受高温影响变化幅度小;停饲CT2000后,试验组产奶量有升高的趋势。（3）试验组日乳蛋白合成量呈逐渐上升趋势,而对照组逐渐下降;对照组日乳脂合成率逐渐下降,而试验组在停饲CT2000后又呈上升趋势。
10 Holstein cows in similar parity （2 - 3） and mid-late-lactation stage （180 d） were randomly divided into control group and experimental group. The concentration of CT2000 in the experimental group was 30g/d/herd. The results showed that： （1） Milk yield of both groups was notably negatively correlated to mean TH1 and maximum temperature （ P 〈 0.05 ） （2） Descending rate of milk yield in experimental group was extremely higher （ P 〈 0.01 ） compared with that in control group before feeding CT2000 during hot period and milk yield won an increased trend after withdrew CT2000. （3） Lactoprotein yield during trial and milk fat yield after withdrew CT2000 were increased in the experimental group, while declined in the control group.
出处
《家畜生态学报》
2008年第2期30-34,共5页
Journal of Domestic Animal Ecology
基金
江苏农林职业技术学院校内课题
