鸡新城疫的诊断与预防控制措施
Guangxi Journal of Animal Husbandry & Veterinary Medicine（2011）
Abstract
<正>1流行病学鸡新城疫一年四季都可发生,以春夏季节多发。即使已经完成新城疫免疫接种、有一定抗体水平的鸡群也可发生。发病日龄不等,以二免20日龄~30日龄和35日龄~50日龄发病最为严重,也
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