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。
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.
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。
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