Interesting, with kings, females form cloaca plugs after copulation. This often confuses many keepers that used more then one male.
It without question can be a problem with the female. But males can also be infertile. Its that way with every species I have worked with. In the old days, keepers would swab for sperm and check for mobile active sperm. Sometimes, no sperm was found in the males. Particularly early in the season.
In the field, males generally emerge well before the females and heat up long before the females emerge. Again, with other species. Hogs, I do not know. Thanks for your experience.

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