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- W1642496594 abstract "During the Interbull Technical Workshop in Beltsville, MD, US, a paper from de Jong (2003) raised the question of validity of applying a timeedit to incoming data for MACE evaluations. The time edit applied when selecting data for breeding value prediction and sire variance estimation was first used in 1998, based on studies by Weigel and Banos (1997). The authors studied the effects of upgrading populations on MACE results, by simulating populations with different genetic means and variances and importing from the population with high mean and variance to the population with low mean and variance. The effects of importation were to increase the mean and variance in the importing population over time. Comparisons of bulls, especially the best bulls, between populations were biased if all data were used in MACE. Restricting the data used in MACE to only recent years resulted in sire variance estimates that reflected current instead of base populations, which eliminated the biases and increased the accuracy of international comparisons. Sullivan (1999) derived procedures that could be used to estimate sire variances reflecting the current base populations without the need for a time-edit of the data. It has not been established, however, if the biases in the study of Weigel and Banos (1997) were strictly caused by the sire variance estimates used in MACE or if there were additional contributing factors. Effects of time-editing on differences in genetic group estimates, for example, may affect comparisons of bulls between populations." @default.
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- W1642496594 date "2003-01-01" @default.
- W1642496594 modified "2023-09-24" @default.
- W1642496594 title "Analysis of genetic groups in MACE evaluations with different time-edit on data" @default.
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