Abstract
The influence of cytoplasmic effects on weaning weight (WW) and age at first calving (AFC) were investigated in the South African Afrikaner beef breed. A total of 14 535 AFC records (1974 - 2008) and 68 152 WW records (1974 - 2011) were used in the estimation of variance components. All cows were assigned to different damlines, using the pedigree information available. The model used for WW include direct additive, maternal additive, the covariance between the animal-, permanent maternal environmental-, herd-year-season x sire- and damline effects, while the simplest model which include only direct- and damline effects were used for AFC. The contribution of the cytoplasmic effects to the total variance was negligible (less than 0.5%) for both traits. These results suggest that cytoplasmic effects can be ignored in genetic evaluations of Afrikaner cattle for the traits investigated.Keywords: Age at first calving, beef cattle, damline, weaning weight
Highlights
Introduction TheAfrikaner beef cattle breed is an important component of the South African beef industry, being promoted as a dam line for crossbreeding purposes
The focus of this study was to investigate the influence of cytoplasmic effects on genetic parameters of weaning weight (WW) and age at first calving (AFC) in the South African Afrikaner beef cattle breed using mixed model methodology
The most comprehensive model, which included direct additive, maternal additive, direct-maternal covariance, permanent maternal environmental, herd year season x sire- and damline effects, was the most appropriate model for WW, while the simplest model which include only direct- and damline effects were used for AFC
Summary
Introduction TheAfrikaner beef cattle breed is an important component of the South African beef industry, being promoted as a dam line for crossbreeding purposes. The focus of this study was to investigate the influence of cytoplasmic effects on genetic parameters of weaning weight (WW) and age at first calving (AFC) in the South African Afrikaner beef cattle breed using mixed model methodology.
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