Taking the time to scratch the sows is one of the signs of an above-average producer. How to AI 1. Fresh semen can be used for up to a week after collection, but it is safest to use it within 4 to 5 days. Because there are no commercial AI stations in Hawaii and semen is brought in from the mainland, it is necessary to use overnight or second day express delivery. Semen from some boars lasts longer than from others, keep careful records and check to see which boars give the best conception rates and litter sizes.
Frozen semen can last for years.
Unfortunately boar semen does not freeze well, so conception rates and litter sizes are poor using frozen semen. Semen from some boars will freeze better than others, but even the best results are far below natural mating results. I strongly recommend using fresh semen only. Semen collection Boars are trained to mount a dummy. Only the milky sperm high fraction is collected, the more clear fluid at the beginning and the gel at the end of ejaculation are discarded.