early Early Carboniferous
early egg layingperformance
Early Production Period
early production system
Late Carboniferous-early Early Permian
cocoon for egg production
egg production
生产性能
产蛋鸡
产蛋性能
产卵量
制种
产蛋量
产蛋率
蛋生产
产蛋
产蛋数
抱卵量
生殖力
egg production abilities
egg production capacity