二、用北京油鸡和隐性白鸡组成纯繁和杂交三个组合,饲养后代1200只,14周龄屠宰40只,公母各半。

• Three groups (n=1200) of Beijing Fatty and Recessive White Plymouth Rock and Beijing Fatty x Recessive White Plymouth Rock were raised. Forty chickens (half male, half female) were slaughtered at 14wks.