Among the four species of Bovidae, genetic differentiation in the HSL genes between yak and buffalo is equivalent to that between buffalo and cattle and between buffalo and zebu.

• 研究表明, 牦牛、普通牛和瘤牛3个物种间的遗传距离大小相近, 牦牛和水牛间的遗传距离与普通牛、瘤牛和水牛间的遗传距离大小相当。