The occurrence of sperms in the genital tract,thus disrupting normal sperm transport and fertilization i.e.lower conception rate of interspecies crossing in the yak.

• 精子抗体的产生致精子再次进入生殖道时失活甚至凝集，使精子难以上行和受精，因而严重影响牦牛种间杂交的受胎率。