Observations on the influence of intestinal spirochaetosis in broiler breeders on the performance of their progeny and on egg production.

Observations were made on the effect of avian intestinal spirochaetosis (AIS) in eight broiler breeder flocks on the performance of their commercial broiler progeny flocks, and also on the production of eggs and the selection of hatching eggs. The effect of treatment on egg production was analysed. The broiler breeder flocks were examined for the presence or absence of antibodies, spirochaetes and clinical signs of AIS, and correlated with the performance data from 136 commercial broiler flocks produced by them.