Heat detection is the process of identifying which females are receptive to mating. A sexually mature female pig in good health should cycle every 3 weeks if she is not pregnant or lactating. (The estrous cycle of swine lasts approximately 21 days.)

On day 1 the female is receptive to mating; ovulation occurs on days 2 to 3. There are various conditions that the female can display which indicate the onset and/or presence of heat. Not all conditions are present in all females. Gilts may display characteristics differently than sows. Some of the signs that help to identify pigs on heat are shown in the clip above.

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