天祝白牦牛被毛形态及纤维类型分析

Analyzing on sharp and fibre type of hair coat in Tianzhu white yak

为了研究天祝白牦牛毛绒生产性能，试验采集了1～7周岁天祝白牦牛体侧部、腹部、肩部、背部、股部被毛毛样进行纤维类型分析。结果表明：绒毛和两型毛含量随年龄的增长逐渐降低，粗毛含量随年龄的增长逐渐升高。1—2岁天祝白牦牛被毛中绒毛含量高，品质好，但个体小，产量相对较低；3～6岁绒毛含量基本稳定，被毛品质较好，个体产量较高，是天祝白牦牛产绒性能最佳的阶段；7周岁以后绒毛含量明显降低，平均为18．41％，被毛品质变差，绒用性能降低。说明天祝白牦牛身体不同部位中，体侧部绒毛产量高，品质好；腹部粗毛（裙毛）产量高，品质较优。

To analyze fibre production performance of Tianzhu white yak, the hair coat was selected sampled including thigh, back shoulder, body side and abdomen in Tianzhu white yak grazing from one to sever years old. The result showed that the villus and heterotypical hair becanle decreased gradually with aging while the contents of the coarse wool became elevated. The contents of yak woo! from one to two years old Tianzhu white yak hade the good quality, but the yak was small and the yield of yak wool was low. The contents of yak wool from three to six years old Tianzhu white yak mainly steady , the quality of hair coat was good and the yield of yak wool was high, this was the best stage for Tianzhu white yak to produce yak wool. After sever years old, the contents of yak wool cut down obviously with its average 18.41%, the quality of hair coat was bad and the performance of yak wool degraded. For the difference site of Tianzhu white yak, the yield of yak wool on body side is high and have the good quality, while the yield of shag on abdomen is high and have the good quality.