Phenotypic and genetic correlations between breech cover and wrinkle scores with lamb survival were estimated from research (Cooperative Research Centre for Sheep Industry Innovation Information Nucleus) and industry data (Sheep Genetics MERINOSELECT). Breech cover has a moderately antagonistic genetic relationship with direct lamb survival despite favourable relationships with many lamb survival indicator traits. Wrinkle, however, has negative genetic relationships with lamb survival both as a trait of the ewe and as a trait of the lamb. Merino breeding programs that include wrinkle as an indirect selection criterion for flystrike will generate correlated improvements in lamb survival, although the extent of these will depend on the genetic relationships between wrinkle and other production traits in the breeding objective. An appropriately weighted selection index is required to take account of these genetic relationships.