Well, remember 12lbs is a "bare minimum". I personally think a mature female should weigh more than that. I have one female that is being bred this year who is over three years and is around 16-18lbs or so. I also have another female that is 5 years and is around 25lbs. I think it is much healthier for the boa to be mature and have some good size on them. I think 25lbs is a good size. Just as long as it is a mature animal...........And, not a pumped up one.
I tried breeding a female that was 2 1/2 years and 12-13 lbs. She had a premature litter. I can't say that it was because she was too young or too small. But, it was enough to make me never want to bred a female that young or small again.
John
-----
"To be the best..........You must lose your mind."