Seven cattle breeds, including Simmental, Charolais, Limousin, Angus, Jinnan, Qinchuan, Luxi, were used as experimental population.

• 选用西门塔尔牛、夏洛来牛、利木赞牛、安格斯牛、晋南牛、秦川牛、鲁西牛作为实验动物群体。