猪瘟母源抗体消长规律的测定和免疫效果观察试验

本试验测定了6窝母猪免疫后产小猪0、1、7、14、21、28、35、42日龄猪瘟母源抗体消长情况和28～35日龄首免及二免后免疫效果观察。结果:未吃初乳的0日龄仔猪无母源抗体,1日龄仔猪母源抗体滴度达到高峰,以后逐渐降低;猪瘟母源抗体对1～28日龄的仔猪有保护,少部分仔猪在35日龄还有保护。28～35日龄首免后21日达到73.3%免疫保护,28日则达到93.3%;首免后1个月加强免疫一次,其较高的免疫抗体水平可以维持到二免后4个月,到5个月还能产生免疫保护,免疫合格率为73.3%,但6个月后免疫合格率降至46.7%;因此建议生产实际中,商品猪进行两次免疫即可,种猪以后每6个月免疫一次。

Changes of Maternal Antibody Level of SwineFevert and Test on Immunization Effect

The author detected swine pest maternal antibody came from 0,1,7,14,21,28,35 and 42-day-age piglets born by 6 pigs.The immunity effect after first and second immunity also was observed.The results showed that maternal antibody didn＇ t existed in 0-day-age piglet without eating colostrums,and the highest level of it occurred in second day,then it gradually degraded.l~28-day-age piglets were protected by swine pest maternal antibody,some piglets also survived after 35-day-age.The piglets were first immunized in 28~35-day-age.Then the protected rate was 73.3%after 21 days and 93.3%after 28 days.The second immunity occurred in the 31st days after the first immunity.The high level of immune antibody could sustain within 4 month after the second immunity, and the immunity protected rate was 73.3%in the fifth month,and it decreased to 46.7%after 6 months.Therefore, the suggestions were the pigs only needed twice immunity before they were sold and breeding pigs should be immunized after every 6 months again.