产犊季节的划分及其对估计育种值准确性的影响  

THE GROUPING OF CALVING SEASONS AND ITS EFFECT ONTHE ACCURACY OF BREEDING VALUE ESTIMATION

作　　者：张勤[1] 

机构地区：[1]北京农业大学畜牧系

出　　处：《畜牧兽医学报》1994年第1期41-46,共6页ACTA VETERINARIA ET ZOOTECHNICA SINICA

摘　　要：奶牛的产犊月份对其泌乳性能有极显著的影响。在进行奶牛的育种值估计时，需要将产犊月份划分为产犊季节，而后对产犊季节进行校正。但对产犊季节的划分却没有统一的规则。本文给出了当操作模型的产犊季节划分与真实模型不等时育种值的ＢＬＵＰ估计值的误差方差、偏差和均方误的计算方法，并以一实际资料为例讨论了对产犊季节的不同划分对育种值排队顺序、误差方差、偏差和均方误的影响，以及在划分产犊季节时应掌握的一般原则。The calving month of dairy cattle has very significant influence on its milk Perfor-mance, by estiniating breeding values,it is usually to group calving months into seasonsand then to adjust the effects of calving seasons. However,there is no a common ruleof grouping calving seasons. This paper gives the methods of calculating the error vari-ance,the bias,and the mean equare error of a predicted breeding value obtained withthe BLUP method when the grouping of calving seasons of the operational model is dif-ferent with that of the true model. With a actual data set it was shown that the diff-erent grouping of calving seasons has considerable effects on the rank, the error vari-ance, the bias, and the mean square error of predicted breeding values. The generalprinciple of grouping calving seasons is also discussed.

关 键 词：育种值估计 产犊季节 乳牛 

分 类 号：S823.2[农业科学—畜牧学]