【摘要】 群选法应具有八大原则:外貌一致;身体结构砖形;具有高度生产性能;正确的鉴定指标和方法;进行高度选种选配;淘汰要求严格;要有合适生态条件;选育方法不断改进. 组群数目和原则,羊群中符合育种指标的最好种羊,列入核心群;符合育种或接近育种指标羊群,列入一般群;不符合上述的羊只,列入淘汰群. 细毛羊鉴定指标如下:羊毛细度从60—70支;毛长7厘米长以上;毛密中等;弯曲形状要求大弯,少数可以中弯;油汗洁白或乳白,排出黄色及深黄;体重合乎育种指标,即公羊80公斤以上,母羊40公斤以上;产毛量为体重12％;净毛率一般为50％左右,不低于40％.更多还原

【Abstract】 The eight principles of mass breeding method have to be administered exactly. The number of grouping herd includes nuclear herd, general herd and culling herd. The merits and demerits of the fine sheep have to be known well. The indices of evaluation are as follows: the degree of fine wool has to be over 60—70 counts; wool length has to be over 7 cm; the density of wool has to be middle grade; crimp of wool has to be large or middle degree; colour of yolk has to be white or milk white; the weight of ram has to be over 80 kg and ewe has to be over 40 kg; the wool production has to be over 12 per cent of body weight; percentage of wool yeild has to be over 40—50％.更多还原