Yes, it could be the best solution if the female was pregnant for too many times or if you don't want any degu babies. But it depends on vets in your country. In Czech republic vets don't have much experience with small animals and they told me that the chance of surviving this surgery is only 60 %. But I know that in some other countries vets do that without problems and it isn't so risky. So ask the vet, he'll tell you. Both males and females can be neutered, the vet should tell you which would be better.