Recessive White Plymouth Rock (RWPR) grew faster than Cross and Beijing-fatty (BF). At 8 wks of age, body weight (BW) of RWPR amount to 1308.86 g and body weight of Cross is 1030.5g ,while BF only 630.75 g.

• 隐性白鸡的生长速度大于杂交鸡大于北京油鸡；8周龄时隐性白鸡的平均体重达1308.；86 g；杂交鸡的体重为1030