This work was carried out to compare alternative methods for the adjustment of the age effect on weaning weights of beef cattle. A simulation with six growth curves, 10 000 animals per curve and 50 replicates was done to generate the birth weight (BW), weight at 240 days and weaning weight (WW) from 195 to 285 days. Seven alternative methods were used to obtain adjusted WWs, including the usual BIF adjustment formula, age as a covariable and combinations of them. To evaluate the methods the average bias, mse and the correlation between real and adjusted WWs were used. The method where the BIF adjustment was used combined with an extra covariable for the age effect on the adjusted WW were, in general, better in terms of bias, mse and correlation. Care should be taken before extrapolating these results to data with small contemporary groups and variable growth patterns among groups.
This work was carried out to compare alternative methods for the adjustment of the age effect on weaning weights of beef cattle. A simulation with six growth curves, 10 000 animals per curve and 50 replicates was done to generate the birth weight (BW), weight at 240 days and weaning weight (WW) from 195 to 285 days. Seven alternative methods were used to obtain adjusted WWs, including the usual BIF adjustment formula, age as a covariable and combinations of them. To evaluate the methods the average bias, mse and the correlation between real and adjusted WWs were used. The method where the BIF adjustment was used combined with an extra covariable for the age effect on the adjusted WW were, in general, better in terms of bias, mse and correlation. Care should be taken before extrapolating these results to data with small contemporary groups and variable growth patterns among groups.
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