A gerbil often accepts his sister as a mate, but inbreeding has its own negatives. ... Gerbils are polyestrous, which means they are sexually responsive or "in heat" several times a year. They can mate and rear offspring regardless of the season.

Can gerbils interbreed?

Gerbils and mice can't breed because their genetics are different. They're both rodents but are sufficiently different that they can't interbreed. Only animals with similar genetics can produce viable offspring. Gerbils and mice will fight if kept together because they don't get along, making mating impossible.

Can two female gerbils have babies?

It's perfectly fine – and even recommended – to allow the mother and father to raise their pups together. The only exception is if you don't want them to have a second litter. Gerbils can get pregnant again the same day that they give birth.