I'm with Rich, except Sept. through December when I feed them as many as they'll take.
I don't like to feed over 100 gram rats but have many times without any problems, but then my smallest large female is 2400 grams.
I have a couple females over 3000 grams and they will take two 150 grams rats like they were snacks.
After feed up time is over I go back to small rats once a week for my breeders.