Genetic resistance to two Marek's disease viruses and its relationship to production traits in chickens

Abstract

correlations, based on variation between and within the genetic groups were also higher with RB-1B.In the test with BC-I there were deaths from an early mortality syndrome (EMS) prior to development of MD. Losses from EMS in Leghorns were highest in 2 genetic groups most resistant to MD. Based on genetic group means, correlations between MD incidence and egg production and egg weight were high and negative. In contrast the correlations between MD incidence, age at first egg, total blood spots, and egg specific gravity tended to be positive. No consistent relationships were found with adult body weight.