Pregnancy Rates in Horro and Holstein-Horro Cross-Breed Cattle Breeds Following AI With Sexed Semen Under the Smallholder Farming System in Central Ethiopia

埃塞俄比亚中部小农户耕作制度下，采用性别控制精液进行人工授精后，霍罗牛和荷斯坦-霍罗杂交牛的妊娠率