How do I say this in a family friendly way LOL.
A male rat, whether that's an ASF or a regular sized one, needs to be an enthusiastic breeder. Especially with ASF's because the females will not stand still and allow him to mount them unless he chases them a bit first. If he's not chasing them around, he's not impregnanting them. Also, again with ASF's and regular rats, male rats need the "equipment" to be able to breed many females. Some male rats are just not born with enough "junk in their boy trunk" to get the job done as well as other male rats might. (gawd it would just be easier to say "they need to have big testicles" wouldn't it LMAO)
Because of issues with ASF's not accepting new members into a breeding colony you may have to either start over with better breeders or allow time for one of the sons of this colony to grow up within the colony and begin breeding. You'd need to remove his sire to avoid somebody getting chewed up. I know some folks can keep more than one male to a colony or introduce new ASF's into an established group but everytime I've tried it some poor rat got slashed to ribbons within seconds.










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