环境因素 Environment
①饲养密度过大 Too high density
②光照太强或不均匀 Lighting
③鸡舍灰多 Dust
④通风不良 Ventilation
⑤饲槽面积不够 Feeder space
⑥湿度太高 Too high humidity
⑦温度太高或不稳定 Too high temperature
⑧外部寄生虫多 External parasite
⑨断料 Scarce of feed
⑩外伤 Wound
■ 营养不足 Malnutrition
缺乏钙、磷、粗纤维、粗蛋白,植物
蛋白太多 Insufficience of Ca,P,CP,CF
Too high plant protein
■ 激素 Hormones
Before onset of laying