【摘要】 本文采用江西省畜牧良种场近年使用的13头公牛的579头女儿牛的第1胎产奶资料(其中540头女儿牛有第1胎平均乳脂率,464头女儿牛有第1胎时外貌评分记录,为头例,计算13头公牛的总传递力指数(TT1)。同时也按总性能指数(TP1)法计算了13头公牛的TP1。两种方法所得公牛排列名次间的等级相关为0.923(P<0.01)。结果表明:TT1可以代替PT1对乳用种公牛综合评定。更多还原

【Abstract】 Data of the example of this paper including 305 day milk yields of 1st lactations of 579 daughters, where 540 daughters have average fat percentages and 464 daughters have general appearance scores of 13 black-white dairy sires at Jiang-Xi Provincial Fine Breeding Farm. 13 dairy sires’ TTI and TPI were computed respectively. Rank correlation of rank orders of sires between TTI and TPI is 0.923 (P<0.01).The result shows that TTI is an effective measurement of dairy sires’ comprehensive selection and has obvious practical Value. TTI may replace TPI to be extended in dairy cattle improvement.更多还原