Wow.. misinformation abounds! Yay!

All 40+ of mine are on mice, they thrive, they shed, they breed, the produce eggs, which in turn produce healthy offspring. If they didn't do these things, then I would change.

I have a few 2000g+ girls who get 3-4 mice a week(depending on the size of the mice), skipping a week here and there, and they gain weight wonderfully. My adult males get 2-3 depending on their size and the size of the mice. Hatchlings to yearlings get 1-2 depending on their size. To me, mice have more lean muscle mass without alot of fat, so in turn, my snakes gain alot of that lean muscle mass, with just a slight fat covering. No flabby snakes here

Chris, if you can get mice more readily than a just-weaned rat every week, then go with that. Consistency is key. If he's a non-breeding adult male, he really doesn't need any more than 2 adult mice a week to thrive and maintain his weight. Remember, these are very sedentary animals who have incredibly slow metabolisms, and they don't need a whole lot of food to maintain.