Is this normal, should I seperate them and try another male?

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Originally Posted by angllady2

Unfortunately, it does happen. I've had one male rat who acted that way, and several male mice who did. They always get fed off. I give him a little time to make sure it's just not him being overeager, but if the female flips over trying to ward him off, or if he won't leave her alone to eat or sleep, he goes.

Gale

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*AGREED!

I highly recommend getting rid of any pups from his bloodline if you can afford to. If the remaining female is pregnant the pups should be feeders, imo.