First, the age of gilts and boars first contact, the results of the study showed that the best time for hybrid gilts to start contact with boars was 150-170 days of age. The best time for purebred and late-maturing sows to come into contact with boars is roughly 170-190 days of age.
The second is the age and sexual behavior of boars. Young boars do not produce sufficient pheromones, so the minimum age of boars used to induce gilts in gilts should be at least 10 months and have a high XY. Studies have shown that gilts with a high XY semen have a 9-15 days earlier estrus than gilts with a low XY, and estrus rates within 20 days of contact with the boar increase significantly.
The third is the contact method of the boar. From the point of view of the breeder, it is easier for the gilts to pass the estrus identification than to send the boar out of the sire. However, this male-female barrier contact mode is insufficient for most gilts. In addition, the effect of bringing gilts to the barn for full access to the male and female is better than the effect of bringing the boar to the sow.
Fourth, the number of boar contact, the study concluded that to maximize the boar aphrodisiac effect, the gilt should be twice a day with the opportunity for the boar.
Fifth, the boar's duration of temptation, in order for each gilt to obtain good aphrodisiac from the boar, must do the following two things: Ensure that the boar has sufficient contact time with each sow; Ensure that the boar has enough space to make contact with the sow. The data from the study showed that 10-15 minutes of full-scale contact each day can fully promote estrus in gilts.
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