I feed small rats to my adults once a week. Multiple smalls to the big girls. At the very most, medium.
I feed smaller and more frequent meals to avoid feeding larger and less often. I feed live, so this is the safest way to go about feeding since large rats have the potential to be really dangerous.
Nothing is wrong with feeding mice. They have almost identical nutritional value as a rat. However, it's more convenient to feed 1 rat compared to multiple mice. And sometimes a snake won't eat more than 1 or 2 prey. I have an adult female who eats 2 small rats in a sitting. She refuses a 3rd each time. If I had to feed the equivalent amount of mice, she probably would be pretty skinny if she only takes 2 mice at the max.
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