I've bred rosies where the cages had a heated end but the rest got darn cool in Winter. Some of those snakes would feed sometimes, some did not feed much at all. I got babies from that setup.

I have also done the brumation thing, no heat. Got babies from that too. A few yrs I cooled them to 65 deg, other yrs it was more in the 55-60 range. I really don't think there was much difference in results. But definitely darken the cages during that time.

The best litters were from females that were around 3 yrs or older and had access to 85-90 deg heat during gestation at least during the day. Thats when I got big chunk babies.

My smallest litters/skinniest babies came from females that were kept at only 80 deg. I admit I did not do an exact study or anything like that. It was simply evident that the females would use higher temps than 80 if offered, so I offered. And if a female is choosing that, then she wants it obviously, and she knows better than you and me what she needs.
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Mark

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