What breed of hamster are you wanting to breed? If they are syrians, I wouldn't recommend it. Syrian hamsters don't do well in groups and if you can't find a home for all of them they will begin to fight. But if they are the dwarf breed when introduced at a young age they will not fight. So beware...also do some research on the net. I'm going to breed dwarf hamsters for my SAE (Supervised Agricultural Experience) for FFA. And I've done about a months worth of research. So get into those books.