They should breed quickly if you have a cooperative pair. The ones I bought were litter mates so they did fine. They take FOREVER to get up to adult size though. I have some babies that are 2 months old and are only about halfway to adult weight.

I'm not sure about breeding in winter because I just got mine. They don't eat too much, I think because they don't get very big (~85g is my biggest). I feed a group of 2.2 a small handful of food each day. I doubt a 2.2 group would go through more than 5lbs of lab block a month.

They can be jerks sometimes if you move them from tank to tank, nothing like normal rats from the pet store. I would suggest normal rats if they are an option.

My info kinda sucks but nobody else replied yet, so hope this helps.

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