摘要:The appearance characteristics of Jiulong yak and grassland type yak F1 hybrids were determined with 3.5-years-old and 4.5-years-old. Jiulong yak improved grassland type yak, its appearances were shown that: all had horns, 45 heads of horn pointing upwards accounted for 84.9%, 8 heads of horn pointing back accounted for 15.9%, 49 heads of yak had black hair, accounted for 92.5%, the brown accounted for 1.9%, 47 heads of yak had curly frontal hair, accounted for 88.7%, 6 heads of yak had not curly frontal hair, accounted for 11.3%.%共测定3.5岁18头(公9头、母9头)和4.5岁35头(公16头、母19头)九龙牦牛与草地型牦t牛杂交F1代的外貌特征,结果为:全部有角,角尖向上的45头,占84.9%,角尖向后的8头,占15.9%;被毛黑色的49头,占92.5%,棕色的1头,占1.9%;额毛卷曲的47头,占88.7%,额毛无卷曲的6头,占11.3%。