摘要
用四川省阳坪种牛场 1 992年— 1 997年的黑白花奶牛共计 31 2个泌乳期的泌乳曲线 ,以研究胎次、产犊季节、干奶天数和初产年龄四个因素对模型参数估计值的影响。结果表明 :胎次的差异对参数a、b、c影响显著 ,对参数tmax影响不显著 ;产犊季节的差异对参数tmax影响显著 ,对参数a、b、c影响不显著 ;初产年龄的差异对参数a影响显著 ,对参数b、c、tmax影响不显著 ;干奶天数的差异对参数b、c、tmax影响显著 ,对参数a影响不显著 ;
The lactation curve data of 312 Sichuan Holstein dairy cattle derived from Yangping cattle farm from 1992 to 1997 were used to fit Wood model in order to study the effect of fetus,born season,milk over days,and age in first fetus on the estimate values of the parameters a,b,c and t max of Wood model.The results showed that:the difference of fetus have the outstanding influence on a,b,c but not t max ,that of born-season on t max but not a,b,c;that of age in first fetus on a but not b,c,t max ,that of milk over days on b,c t max but not a.Moreover,the estimated values of a,b,c and t max of Wood model were given out for reference.
出处
《四川畜牧兽医》
2000年第B07期19-20,共2页
Sichuan Animal & Veterinary Sciences
