The effect of Ornithobacterium rhinotracheale vaccination of broiler breeders on antibody titres and performance of breeders and broilers was investigated. O. rhinotracheale antibody titres and performance data were recorded from 16 different broiler breeder flocks and from 79 of their broiler progeny flocks. Eight breeder flocks were vaccinated with an inactivated O. rhinotracheale vaccine while the other eight breeder flocks were left unvaccinated against this bacterium. Following vaccination, mean O. rhinotracheale antibody titres in the breeders rose to a 6.5 log(2) units higher value than in unvaccinated breeders, and remained at a mean titre of 15 log(2) units during the entire production period. This resulted in significantly higher maternal antibody titres against O. rhinotracheale in the broiler progeny of vaccinated breeder flocks compared with the offspring of unvaccinated flocks. Statistical analyses revealed no differences in performance between vaccinated and unvaccinated breeders. There was a significantly lower mean mortality rate and higher mean production index in the broilers derived from vaccinated breeders.
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