Comparison of CAV antibody titers in a vaccinated and naturally infected broiler breeder flocks

Abstract

The objective of the present work was to perform the efficacy of one attenuated live vaccine Nobilis CAV P4 (Intervet Co., Netherland) in broiler breeder and their progenies compared to naturally infected flock. The vaccine was administrated to Ross 308 broiler breeder at 6 week old through S.C. rout. A total of 352 serum samples were collected from vaccinated and unvaccinated breeder flocks (that infected naturally) from 6 to 33 weeks old and 2 times in their progenies at one-day old. Sera were analyzed using indirect Elisa kit (Synbiotic Corporation, USA) and data obtained were compared between 2 groups statistically. Due to natural infection of chicken infectious anemia (CIA) in unvaccinated breeder, mean titer in breeder and their progenies was significantly higher than vaccinated breeder and their progenies (P<0.05). The CV%s in breeders was not different significantly (P>0.05) but CV% in progeny of unvaccinated breeder flock was twice more than progeny of vaccinated flock. There were 5 and 12% of zero titers of antibody in hens and progenies in unvaccinated breeder flock respectively. All breeders from vaccinated flock were positive serologically. It seems that vaccination could be an efficient rout for eliminating susceptible birds, decreasing variation in antibody titers and induction persistent and homogenous antibody titer in progeny.