I followed the 10-15% rule when mine were smaller, but when they got on ~small rats I just started eye balling the feeder size and fed every 7 days and my one girl who's on larges I feed every 2 weeks. It's easy for them to get overweight but I've read well known breeders who feed adults weekly, but I've had no problems feeding the bigger ones every 10-14 days.
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