If you take care of the boar and take care of his semen you will have a good AI operation and AI breeding.
Never, never ever treat a boar badly or rush him!
Successful on-farm AI is all about getting it right each and every time.
The average collection frequency should be 2 or 3 times every two weeks. Boars should be worked once a week even if the semen is not needed to help maintain the highest quality semen in the ejaculate. The more regular the frequency the more consistent boars will remain.
Some good rules to follow when training boars are:
Training the Boar