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禽蛔虫病的流行情况如何
更新时间: 2019-01-11 00:00:00  

鸡蛔虫发育不需要中间宿主,成虫寄生于鸡的小肠内,所产卵随粪便排到体外。刚排出的虫卵,没的温度和湿度条件下经10 ~ 121含有一个卷曲的幼虫。鸡采食了这种虫卵,幼虫在腺胃内悦壳而出,移行至小肠,钻入肠黏膜继续生长发育;经过19天左右,幼虫离开肠黏膜进肠腔,再经过2周时间发育为成虫。蛔虫整个发育期需要 35 ~60天。由于虫卵对外界抵抗力强,因而能广泛传播,四季发病。

关键词: 蛔虫 流行 情况 如何

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