The heritability of weaning weight is considered to be moderate. Heritability is measured in percent and describes the portion of variation in a trait that is controlled by genetics. The heritability of weaning weight in beef cattle is approximately 25 percent. This means that 25 percent of the variation in weaning weight observed from calf to calf is due to genetics for weaning weight. The remaining variation is due to environmental influences such as nutrition, dam milking ability, and disease incidence.
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