Umm how to put this delicately....you won't see much action as male rats are rather....speedy.![]()
Mine just seem to bother the females until they figure out they aren't welcome anymore and then just hang out hoping somebody will please come into season LOL. When the females show a distinct pear shape I pull them out into individual 10 gallon tanks where they continue the last week or so of pregnancy in peace, eat like pigs, build their nest and then deliver and rear their young till weaning age. I usually give my females a couple of weeks after weaning their litter to rest and recover in a female only enclosure, before they go back in with the male.
My two male breeders basically live in a male only cage. When both are in "use" one male stays in that cage with his female rats, the other male goes to a big tank where he gets his breeding females or just hangs out with some male feeders for company if he's not needed as a breeder that cycle. I always breed my females in pairs so each male would have two females in with him. After they've done their jobs they go back to being lazy male rats again in their stud cage (nice work if you can get it LOL).