OP said for breeding, but rats that aren't tame can bite when defending their babies etc...best to treat breeders as pets! They're actually smart & affectionate pets-
I had pet rats for years before I ever got into snakes. When a rat is tame, you can smear something like gravy on your hand & they will grab & hold your fingers
somewhat aggressively but then carefully & gently lick your hand/fingers clean without biting. Seriously...NOT stupid! But rats that are never handled will be on
the wild & defensive side...even though "domestic" they can "take care of themselves". So respect them, treat them well & fairly...it just works much better.![]()