高母源抗体下蛋雏鸡新城疫最佳免疫程序探讨

通过在不同日龄和不同母源抗体水平时对具有鸡新城疫（ND）较高母源抗体的蛋雏鸡进行免疫，探讨在高母源抗体下蛋雏鸡新城疫免疫程序与免疫效果的关系。结果表明：用新城疫弱毒疫苗和油乳剂疫苗同时免疫后,免疫越早，受母源抗体干扰越大，总体免疫效果越差；当ND母源抗体降到6log2左右（大约在11～13日龄）时进行首免，隔14天进行二免，鸡体产生保护水平（6log2）以上的ND抗体最快、抗体水平上的最高、维持时间最长，总体免疫效果最好。因此，母源抗体6log2时首免，14天后二免为最佳免疫程序。

Study on immune effect of Newcastle disease used immunization program for Chicken eggs under the high maternal antibody

This experiment' s aim is to evaluate the relationship between the immune procedure and the immune effect under the high ND maternal antibody through immuning chicken eggs with high ND maternal antibody at different ages and different levels.The results show that the maternal antibody has much more influence on chicken' s immune effect after using the live vaccine and oil-emulsion vaccine at the same time and the influence is much obvious to the younger chicken eggs. When the first immunation is got to 6log2 (11 ~ 13 days) and the second 14 days later,the level of protection (6log2) antibody ND can be the fastest, the highest and maintain the longest.So the best immunization procedure is the first when the chicken maternal antibody reducing to 6 log2 and the second 14 days later.