Personally, I have been keeping and breeding boas (normally around 100 boas in the collection up until this past year), and my humidity is in the low 60s. I have never had a constipation issue, and here is why... I feed my boas appropriately. If you are feeding your 15 month old boas large rats, your are putting massive physiological stress on that animal. This, will ultimately result in constipation and very likely death prematurely for that animal. Boas are not built to eat at that rate, but they will if offered. I highly doubt soil was an issue early on either, as remarkably boas and their relatives have been living in the wild, on soil, for millions of years. No boa I have ever caught in the wild looks like a boa from most collections in captivity. Overfeeding is very likely the issue here.
My feeding schedule for adult boas is simple. I do not feed from November through to March. I then feed adult females once every two to three weeks, and males once every three to four weeks. I feed subadult females every 2 weeks and males every 2 to 3. Neonates are feed every 7 to 10 days or so, depending on sex.
Warren
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