用线性评分法对黑白花奶牛(Holstein)的外貌评定

ESTIMATION OF CONFORMATON AND APPEARANCE OF HOLSTEIN-FRIESIAN COWS USING THE LINEAR CLASSIFICATION SYSTEM

奶牛体型的线性评分法是近年发展起来的新方法。他是利用直线刻度来度量奶牛体型的 2个极端的全过程 ,然后对照活体按线性方式排列比较 ,最后根据该体型性状的实际表现状态进行评分的。利用此方法对内蒙古农业大学教学牧场黑白花奶牛进行评定的结果表明 ,牛群整体分数不高 ,但比较整齐 ,按鉴定结果进行排队 ,决定其种用价值 。

The linear classification system is a newly developed method which uses linear daegree sales to appraise the two extremes of conformation of Hoistein-Friesian cows.In poratical application,the judyer gives individual charauters score by measurement or estimation,indiveduse then gets the total score of a cow by summing diffenent scores of induividual characters.By comparing scores of cows,we give their type grades.Estimation has been made in our experimental farm,the results showed that type rating of the cows is not high,but it is unifarm.To give the order of cows is very useful in determining their breeding values,and improving,their genetic potentials.