Swine day, 1968; Swine; Estrus synchronization; Sows
Several methods of synchronizing estrus have been tried in swine. One of the oldest and most commonly used natural methods is weaning pigs from a group of sows simultaneously. When this is done, the majority of sows will show estrus 3 to 7 days later if the sows have been nursed for at least 3 weeks. This method is effective and highly fertile; however, in some cases it is not practical to breed at this time and a natural method of synchronization in gilts is not available.; Swine Day, Manhattan, KS, September 26, 1968
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Kiracofe, G; Koch, B A.; and Hines, Robert H.
"Estrus synchronization in swine: trials with Aimax (I.C.I. 33,838),"
Kansas Agricultural Experiment Station Research Reports: