cpcp彩票
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兩周定成敗
  肉雞出生后,一般來說具有較高的均勻一致的母源抗體,保護雛雞早期免受環境致病因素的影響。隨著母源抗體的消耗和減少,在疫苗抗體沒有達到保護滴度時的15-25日齡時出現免疫空白期。這期間是肉雞整個養殖過程中最脆弱的階段,主要表現為容易發生呼吸道疾病,疫苗反應加重,容易發生支原體、大腸桿菌和病毒性疾病的混合感染。這個階段如果管理得當,肉雞可以順利度過這一階段的危險期。如果管理不當,疾病得不到有效的預防和控制,會造成25-35日齡期間的高死亡率和生產效益低下。
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cpcp彩票
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