Of several possible performance comparisons among pigs, one of the most striking is often that between groups of pigs sired by different boars. Just looking at groups of pigs sorted according to sire may not be very informative. However, records showing the average performance of groups of pigs by several sires will often suggest that there are real differences among sires in their breeding ability. Sire groups are likely to include rather large numbers of offspring out of several different sows, farrowed on the same farm and in the same season, The fact that pigs by pigs in other sire groups is in selecting among sires. In herds where more than one boar is used, selections for herd replacements can be helped by using the information on sire differences as well as individual pig differences.
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Agricultural Experiment Station and Extension Service, South Dakota State College
McCarty, J.W., "Boar-Progeny Performance Differences" (1958). South Dakota Swine Field Day Proceedings and Research Reports, 1958. 12.