Kiracofe, G.Koch, B.A.Hines, Robert H.2010-05-072010-05-072010-05-07http://hdl.handle.net/2097/4060Swine Industry Day 1968 is known as Swine Day, 1968Several 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.SwineEstrus synchronizationSowsConference paper