其他分场未出现类似情况，由此推测该病与种鸡群有关。
So it was concluded that this disease was related to broiler breeder.
为了繁殖出这种特别吃得少，特别能下蛋，特别能抗病的“最有战斗力”的品种鸡，你需要更大的鸡群。
And to breed the most productive hens which convert their feed most efficiently into eggs and are most resistant to disease, you need large flocks.
某种鸡场一群艾维茵父母代种鸡中出现“假性母鸡”，剖检发现输卵管畸形。
The false hens from a flock of Avian parents breed were dissected in a certain chicken farm, and malformation appeared in each oviduct.
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