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Beef sire expected progeny differences calculated by 3 methods



Beef sire expected progeny differences calculated by 3 methods



Journal of Animal Science 44(2): 195-202



Data from 20,239 edited field records obtained from the American Simmental Association [USA] were used to compare 3 methods of evaluating beef sires on the basis of AI [artificial insemination] progeny data for birth and weaning weight. The 3 methods were the regressed least-squares, contemporary comparison and iterative procedures. Expected progeny difference (EPD) values ranged from 96-104 for weaning weight and 92-106 for birth weight. Large numbers of progeny are required to evaluate accurately sires in national programs. For this data set the critical number of progeny per sire required to reduce the standard error of the EPD for weaning weight to 2.0 or 1.5 was about 100 or 300, respectively. The degree of association among the evaluating methods based on sire EPD values was high and average product-moment correlations were .91 for least-squares and iterative, .90 for least-squares and contemporary comparison and .96 for iterative and contemporary comparison.

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Accession: 004814207

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