新疆细毛羊超排胚胎移植核心群育种方案的确定

南山种羊场的育种方案是根据育种目标的4个选择标准，加权综合而形成。计算出的选择指数为：净毛质量＋21.08；毛束长度＋0.58；平均纤维直径-4．23；育成羊体质量＋1.47。估测该方案每世代遗传进展为16～2．1，选择指数标准差依MOET功率而定，与传统的育种改良方案（每世代遗传进展约为选择指数标准差）相比非常有益。

Definition Breeding Program of MOET Nucleus Flock of Xinjiang Fine Wool Sheep

A selection index was formulated for the ram improvement program at Nanshan Stud farm with the following weightings of the four selection criteria incorporated in the breeding objective. The 4 formulated selection index were clean fleece weight (kg) ＋21 .08, staple length (cm) ＋0.58, average fiber diameter (μm) -4.23, and hogged body weight ＋1.47, respectively. It was predicted that the program would provide genetic gains of between 1.6 and 2.1 standard deviations of the selection index per generation, depending on MOET success rates. This method was more favorable than the traditional objective breed improvement, which had expected genetic gains of approximately 1 .2 standard deviations of the selection index per generation.