The aim of the study was to partition the total phenotypic variation in the weaning weight of Hungarian Simmental calves into their various causal components. The data used was provided by the Association ofHungarian Simmental Breeders.The weaning weight of an individual (cattle) is not only determined by its genotype for weaning weight but also by the individual that furnishes its environment (dam). The former is referred to as direct effect while the latter is referred to as maternal effect. I estimated the genetic parameters for weaning weight while accounting for direct and maternal genetic effects in Hungarian Simmental beef purpose cattle.