Okay thank you Kinra. I just weighed the two frozen rats I have left and the one is 80 grams the other is 86 grams so the bigger one is almost 30% of her body weight. I will continue to feed her this size for now until I see some significant weight gain. If you feed 10-15% of body weight and they gain 100-150g a month, and i'm feeding her almost 30% of her body weight a week well if she hasn't gained at least 100 grams by next month i'll have a fecal exam done.