灭活苗可以中和剩余的母源抗体，或更易于激活机体免疫力的产生。
It is felt the killed vaccine either neutralize the remaining maternal antibody or just more easily starts the development of immunity.
经调查分析发现，造成免疫失败的主要原因是雏鸡母源抗体水平低。
The main causes of immunity failure were discovered that lower mother's antibody of chick by investigating and analysing.
如果IBD野毒存在鸡舍，它就有可能突破母源抗体，在传统疫苗起效前开始传播。
If a field virus is present in the house, it will probably break through maternal antibody and start to spread before a traditional vaccine can even start to be effective.
这样，大量原本认为已经拥有有效母源抗体的商品肉鸡，没有拥有足够的有效抗体水平。
As a result a significant number of broiler chicks are hatched with little or no protective antibody from breeders thought to be protected.
本试验用V_4株、V_4株和克隆- 30株联合苗对高母源抗体的雏鸡进行了口服、滴鼻与同居感染免疫试验。
Chicks of highly maternal antibody were tested with vaccines of V4 strain and V4 clone-30 strain by oral administration, nasal drip and cohabitation.
大多数的父母代鸡群经过了IBD活苗和灭活油苗的免疫，以产生高水平的母源抗体对3-4周龄的雏鸡提供保护。
Most parent flocks are vaccinated with both live vaccines and killed oil-emulsion products which produce a high level of maternal antibody that protects the chick for its first 3-4 weeks of life.
三批1500羽肉鸭雏鸭母源抗体消长规律的试验表明，雏鸭母源抗体水平高低及维持时间长短与父母代抗体水平高低呈正比。
The dynastic indicated that the maternal antibody level and its maintenance time of 1500 meat ducklings from three groups paralleled to that of their parents.
三批1500羽肉鸭雏鸭母源抗体消长规律的试验表明，雏鸭母源抗体水平高低及维持时间长短与父母代抗体水平高低呈正比。
The dynastic indicated that the maternal antibody level and its maintenance time of 1500 meat ducklings from three groups paralleled to that of their parents.
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