Need Help on Sizing and Duration of Feeding

So I usually give my 5 year old corn asf or mice between 20-30grams. The ones that run smaller I feed every 10 days and the ones that run bigger I feed every 12 days. My breeder I buy from stopped selling them and referred me to someone else. The guy I got my new asf from was low on 20-30gram asf so he gave me some 30’s-35’s. And even a 40 gram one. They look a lot bigger than I’m used to! So I’m just wondering with the 30-35’s should I continue to feed every 12 days or maybe bump it up a day or two? I just don’t want him getting fat. And then can I even feed him the 40gram one? It looks huge! I’m worried he regurgitate it!

Thanks for your thoughts!


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Sorry just realized I should have posted this on basic care.


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Have you tried comparing the size of the mouse to the size of his body? I don't weigh my mice, so unfortunately I can't help you there, but as long as they're no more than one and a half times as wide as his widest part, he should be good to digest them. But I would definitely only feed him the larger ones on a 14 day schedule.

Originally Posted by Averysmom

So I usually give my 5 year old corn asf or mice between 20-30grams. The ones that run smaller I feed every 10 days and the ones that run bigger I feed every 12 days. My breeder I buy from stopped selling them and referred me to someone else. The guy I got my new asf from was low on 20-30gram asf so he gave me some 30’s-35’s. And even a 40 gram one. They look a lot bigger than I’m used to! So I’m just wondering with the 30-35’s should I continue to feed every 12 days or maybe bump it up a day or two? I just don’t want him getting fat. And then can I even feed him the 40gram one? It looks huge! I’m worried he regurgitate it!

Thanks for your thoughts!


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I've never weighed mine ( although now I'm curious lol), but I feed my 3 yr old a small rat every 2 weeks. I hope that helps in some way! She's able to get it down just fine!
Pic is Crue after eating almost 2 weeks ago; she's due this Wed.

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Thanks guys that info does help! I’ll stick to 14 days with the bigger ones.


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I don't weigh the prey, but I do weigh my snakes. I do loosely follow the munson plan. The time in between feedings varies though, depending on my work schedule and their shed schedule.
I have fed ASF's for larger females after they lay eggs, to help them recover, some get XL Adult mice regularly, if they're over 400grams, but most of my adults get adult mice, once a week, and males get every 2 weeks or so.

Originally Posted by hypnoctopus

Have you tried comparing the size of the mouse to the size of his body? I don't weigh my mice, so unfortunately I can't help you there, but as long as they're no more than one and a half times as wide as his widest part, he should be good to digest them. But I would definitely only feed him the larger ones on a 14 day schedule.

This is the best rule of thumb to follow.