摘要
用36头泌乳中期的荷斯坦奶牛按配对原则分为对照组、烟酸组和烟酸铬组,进行65 d的饲养试验。对照组为基础混合精料,烟酸组在混合精料中添加800 mg/kg的烟酸,烟酸铬组在混合精料中添加10 mg/kg的烟酸铬。结果表明:在夏季热应激条件下,烟酸和烟酸铬使奶牛的粗饲料采食量增加,产奶量分别比对照组提高4.86%和12.02%(P<0.05);烟酸铬组提高乳脂5.0%、乳蛋白2.8%、非脂固形物1.8%;烟酸和烟酸铬使血清PRL、T3、T4激素水平上升(P<0.05),对GLU影响不明显(P>0.05);烟酸对血清COR水平无显著影响,烟酸铬使血清COR水平降低8.80%(P<0.05)。
Thirty-six Holstein dairy cows in mid-term lactation period were randomly divided into control group, Niacin group and Chromium Nicotinate group. A feeding experiment had been carried out for 65 days, during which the Niacin group concentrate was um Nicotinate group concentrate was added with 10 mg/kg added with 800 mg/kg Niacin, the Chromi-Chromium Nicotinate. The results showed that Niacin and Chromium Nicotinate could improve the roughage intake and increase the milk yields by 4.86% and 12. 02% （P〈0. 05） respectively in heat-stressed environment of summer. The levels of milk fat, milk protein and SNF were raised by 5%, 2. 8% and 1.8% respectively for the Chromium Nicotinate group. The serum levels of PRL, T3, T4 were all increased significantly （P〈0. 05） but GLU levels were not influenced significantly for Niacin group and Chromium Nicotinare group; the serum levels of COR of Chromium Nicotinare group decreased by 8. 80% （P〈0. 05） , but Niacin group was not significantly influenced compared with control group.
出处
《华中农业大学学报》
CAS
CSCD
北大核心
2006年第4期411-415,共5页
Journal of Huazhong Agricultural University
基金
荷兰王国国际合作项目
国家农业科技跨越计划项目(2003-22)资助
关键词
烟酸
烟酸铬
热应激
奶牛
产奶量
乳成分
激素
niacin
chromium nicotinate
heat stress
dairy cow
milk yield
milk component
hormone
