摘要
将60头泌乳170 d左右、平均每头每天产奶量26.00 kg的奶牛随机分为5组,对照组饲喂基础日粮,试验Ⅰ、Ⅱ、Ⅲ、Ⅳ组在此基础上分别添加酵母铬0.35 mg.kg-1、0.70 mg·kg-1、1.05 mg·kg-1及1.40 mg·kg-1 (以精料量计算),研究非应激期铬添加水平对奶牛产奶量、乳成分和血液激素指标的影响。试验结果表明:①添加酵母铬对产奶量、FCM产量、乳脂率、乳蛋白率及乳总固体物含量影响不显著(P>0.05);②酵母铬最高添加组乳中总铬含量<0.30 mg·kg-1,符合卫生标准;③与对照组相比,试验Ⅳ组FT3(游离三碘甲腺原氨酸)显著下降(P<0.05),试验Ⅰ、Ⅱ、Ⅲ组FT3较对照组有下降的趋势,但差异不显著(P>0.05),酵母铬对血清FT4 (游离甲状腺索)、皮质醇浓度及胰岛索活性均无显著影响(P>0.05)。
To study the effects of dietary supplementation for yeast chromium, sixty dairy cows with an average daily milking 26.00 kg at 170 day after calving were divided into 5 groups, the milk yield and component were evaluated, and the plasma hormones were assessed. The level of supplementation was 0. 35, 0. 70, 1.05 and 1.40 mg · kg^-1as yeast chromium in concentrates for treatment Ⅰ , Ⅱ , Ⅲ , Ⅳ, respectively, and non-chromium applied was control group. Results showed that： ① There were no significant effects on daily milking, fat corrected milk （FCM）, and the content of milk fat, protein, and solid compounds （P〉0. 05） for all treatment groups. ② The chromium content in milk was lower than 0.30 mg · kg^-1, which met the national standard for fresh milk （NY 5045- 2001）. ③ Comparing with control group, FT3 content in treatment Ⅳ was reduced significantly （P〈 0. 05）, but observed only a tendency of decreasing in treatment Ⅰ , Ⅱ , Ⅲ （P〉0. 05） . Moreover, supplementation of chromium had no significant effects on FT4, cortisol and insulin （P〉0. 05）.
出处
《福建农业学报》
CAS
2005年第3期142-145,共4页
Fujian Journal of Agricultural Sciences
基金
"十五"国家奶业重大科技专项资助项目(2002BA518A21)。
关键词
奶牛
非应激期
酵母铬
产奶量
乳成分
激素指标
Dairy cow
Non-stress period
Yeast chromium
Milk yield
Milk content
Hormone traits
