We used to show pigs all over the place. They are easy to train. They'll do almost anything for an oreo cookie. I have trained quite a few boars to jump the dummie and collected semen from boars to be able to pay more for a good one and be able to spread him over more sows. Show heifer had a question about equine semen I think yesterday, and I know that over 99% of boar semen is used fresh and have shipped some around the country that way. You can freeze it, but you will not have as good of conception rates with frozen semen. The boars that are frozen will have to be and are very good boars.
Justme, there is actually is a Hereford purebreed of hogs.