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yang ji mian yi shi bai yuan yin qian xi
Author(s): 
Pages: 42
Year: Issue:  6
Journal: Henan Journal of Animal Husbandry and Veterinary Medicine

Keyword:  GetLinkList(KeywordFilter('免疫失败:7157原因浅析:6185免疫时机:1459传染性喉气管炎:1375抗生素类:1306养鸡:1204免疫抑制:1074疫苗效果:863法氏囊病:844免疫系统:840')'kw''CJFQ');
Abstract: 1疫苗质量不过关。由于生产厂家多而杂、甚至还有个体生产。其质量很难保证。应购买正规厂家生产制造的疫苗。2疫苗保管、运输过程中温度过高,疫苗反复冻融等因素使效力减弱。3免疫方法不当。每种疫苗都有其最佳接种途径,若为了省事擅自改变会使之无效或效果降...
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