火鸡新城疫母源抗体消长规律及其与免疫的关系

本报告研究了火鸡雏母源抗体的消长规律,并初步探讨了母源抗体对接种疫苗的影响。结果表明,(1)雏鸡母源抗体从1日龄始逐渐升高,6日龄达最高峰(log2 3.47),以后迅速下降,至21日龄全部消失;(2)雏鸡在7日龄、11日龄以及14日龄接种疫苗后的血凝抑制(HI)抗体滴度与不接种疫苗的对照组无明显差别,在19日龄接种疫苗,方能产生HI抗体。因此,火鸡雏首次接种疫苗日龄不宜过早;(3)蛋黄中血凝抑制抗体滴度稍低于其产卵鸡血清中HI抗体滴度,随着孵化时间的延长,蛋黄HI抗体滴度逐渐降低至消失。

STUDIES ON THE CHANGE PATTERNS OF TURKEY'S MATERNAL ANTIBODY AGAINST NEWCASTLE DISEASE(ND)AND THEIR RELATIONSHIP TO IMMUNITY

An experiment was conducted to study the change patterns of the tur-key's maternal antibody against ND and the effects of the maternal antibody on vaccination.The results showed that:1.The maternal antibody of the young turkeys increased gradually from the age of 1 day,peaked(log2 3.47) at the age of 6 days,then decreased rapidly,and finally disappeared at the age of 21 days.2.There were no obvious differences in the hemagglutination inhibition(HI)antibody titers between 7,11 or 14 day-old young turkeys vac-cinated and the control group.HI antibody was produced only when turkeys were vaccinated after the age of 19 days.Therefore it was not suitable for the first vaccination to be given too early.3.The HI antibody titers in the turkey yolk were slightly lower than those in the turkey hen serum.The HI antibody titers in the yolk decreased gradually,finally to zero,as incubation ime increased.