Loyd, this may not be the popular answer, but it is the only answer I can give based on my experience sucsessfully breeding subocs since the early nineties. I always tried to raise my offspring to be breadable at 18 months. i found that with subocs as well as most snakes if an individual has the capability to eat and grow quickly enough to sucsessfully reproduce at 18 months, they will be your most prolific breaders throughout their breeding lifetime. in my opinion this is because they are very fit animals to have been able to grow and reproduce so quickly. sometimes a clutchmate that wasn't feeding aggressively enough to reach breeding size in 18 months wasn't even breeding at 2 1/2 years. I never had any problems with regurgitation during the fattenning up period after egg laying (or any other time for that matter). My experience is based on about nine 18 month old females that I hatched and raised to breeding size and four that wern't able to breed at 18 months old. Some were from a wild caught pair, some were from captive hatched and raised adults descended from that wild caught pair. I made a determination when a snake went into hibernation (okay, okay, brumation) whether I thought it was big enough to breed the following season (approx 32" ). The ones that I thought were big enough always bred the following season with good results. I never had an eggbound female an only an occaisional infertile egg here and there. I successfully bred subocs from 1989 - 1995 then stopped working with them (wish I hadn't) I am now working with them again and will be breeding them next year. another rule of thumb for me is to introduce snakes after each shed to see if there is breeding interest. each has an individual biological clock and we don't necessarily know how it wound except by viewing visual results based on introductions (the best way). I once had a black pine snake female that resisted shedding after brumation. I kept feeding her and kept waiting for a shed, but it wouldn't happen. Finally I thought to introduce a male, breeding was immediate. if I had waited much longer I may have missed her breeding opportunity for that season. every year thereafter she bred before a post brumation shed. granted, that was the only example i ever had of such early breeding, but it convinced me that we just never necsessarily know when it's time for an individual female to be receptive. which ever advice you take Loyd, good luck with your breeding project. Rusty