Estimated genetic parameters for all genetically evaluated traits in Canadian Holsteins

Genetic improvement is a crucial tool to deal with the increasing demand for high quality, sustainably produced dairy. Breeding programs are based on genetic parameters, such as heritability and correlations, economically important traits in population. In this study, we estimated population parameters trends 67 evaluated heifers first-lactation Canadian Holstein cows. The data consisted of approximately 500,000 records pedigree information collected from 1980 2019. were using bivariate linear animal models under Bayesian approach. Analyses resulted 2,211 combinations, which reported here. most highly heritable fat percent (0.66) protein (0.69), followed by stature (0.47). Lowest heritabilities (0.01) observed disease-related traits, lameness toe ulcer, calf survival. correlations between gestation length, size, calving ease measured both heifer cows close unity. On other hand, body condition score pin width, cystic ovaries sole rear teat placement, ulcer genetically unrelated. This study reports that have not been previously published cows, provides updates those estimated. These estimates useful building new indexes, updating existing selection predicting correlated responses due inclusion novel breeding programs.