ABSTRACT. Preweaning growth and viability traits of 1047 lambs from a diallel cross between Texel and Corrie-dale were recorded between 2010 and 2013. Birth weight of live born lambs (BWT), weaning weight at 80 days of age (WWT), growth from birth to weaning (GBW), lambs via-bility at birth, at 72 hrs of age and at weaning were evaluat-ed. Crossbreeding parameters were estimated. There were significant (P