H9N2 virus infections in chickens result in mild respiratory signs and egg production losses. The virus has been reported to cause flu-like disease in humans.
H9N2亚型低致病性禽流感病毒在世界范围的禽群中广泛流行,感染鸡表现轻度的呼吸道症状和产蛋量下降,有报道称此病毒可以感染人引起流感样疾病。
参考来源 - H9N2 AIV的NS1基因原核与真核表达及NS1蛋白对几种细胞凋亡的影响·2,447,543篇论文数据，部分数据来源于NoteExpress
You see, adult female birds during egg production produce a layer of spongy bone tissue inside certain long bones.
你看，成年雌鸟在产蛋的过程中会在某些长骨内产生一层海绵状的骨组织。
Lack, however, suggested that clutch size—the number of eggs a bird lays per breeding cycle—is far below the potential limit of egg production.
然而，缺乏情况表明卵的大小——每一个繁殖周期下的蛋的数量——远低于产蛋的潜在限制。
Biologists have long debated about whether egg production in birds is biologically highly costly, some theorizing that egg production is energetically or nutritionally demanding.
长期以来，生物学家一直在争论鸟类的产蛋在生物学上是否具有很高的成本，有的理论认为产蛋对能量或营养的要求很高。
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