Abstract
Data from a rotational crossbreeding study was used to calculate among-breed heritabilities of birth weight (BWT), weaning weight (WWT), and mature cow weight at 5 years of age. The among-breed estimates were higher than previous within-breed estimates because of the inclusion of genetic differences between breeds. Maternal effects for BWT and WWT also were calculated. These estimates allow for comparisons among breeds and for the eventual calculation of EPDs for hybrid cattle.
Highlights
The wide-scale use of crossbreeding and increased number of a vailable breeds requires comparison between breeds
The among-breed estimates were higher than previous within-breed estimates because of the inclusion of genetic differences between breeds
Maternal effects for birth weight (BWT) and weaning weight (WWT) were calculated. These estimates allow for comparisons among breeds and for the eventual calculation of EPDs for hybrid cattle
Summary
The wide-scale use of crossbreeding and increased number of a vailable breeds requires comparison between breeds. With the analysis procedures currently being used by breed associations, direct comparisons between breeds are not possible without adjusting the EPDs. The purposes of this study were to produce estimates of heritabilities and correlations among breeds and to increase the data available for use in breed comparisons. The purposes of this study were to produce estimates of heritabilities and correlations among breeds and to increase the data available for use in breed comparisons These data will allow for the calculation of EPDs for hybrid cattle. This study is part of the NC-196 national project to study the genetics of body composition of beef cattle
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