10-15% rule is garbage. Some generalized rule someone came up with that ive never followed and i get females breeding and laying eggs before 2 years old.

I feed smaller meals more frequent, doing so youll see they eat consistent and dont go off feed, and they poop less since they arent being over fed.

I feed my adult females regardless how big they are small rats in the 50-70g size e very 5 days. Now that breeding is coming their getting same size rat but every 3 days. I may drop it down to a wean rat or a smaller sized small rat.