Determination of Hog Cholera （ HC） Antibody Level in lmmune Piglets and Analysis of Immune Effect

摘要

[Objective] This paper aimed to provide scientific basis for establishing appropriate immune program.[Method] HC antibody level examinations were done for the 270 copies of serum collected from pig farm.[Result] 106 copies of serum were found giving pre-feeding immunization,and the proportion of pigs at 20,30,40,50,and 60-day old after giving pre-feeding immunization without serum immunity were 0,0,14.2% and 0 respectively.The proportion of antibody titer ≥1:128 dropped from 42.6% at the age of 40 days to 28.4% at the age of 50 days and 12.5% at the age of 60 days.For the examined 164 copies of 25-day old piglets' serum titer,all maternal antibody was ≥1:16,but the proportion of antibody titer ≥1:128 dropped from 96% at the age of 20 days to 62.5% at the age of 25 days.[Conclusion] Diverse proportions of pigs with unqualified immunization and antibody level existed in swinery,this might be the main reason for hog cholera outbreak in pig farms.