>> The first couple of years I started breeding Lampros I fed the females very heavy after egg laying since I breed my own mice. Guess what, unplanned second clutches from most of them. All infertile by the way. From then on slightly reduced at first, then more towards the end of the season. No more second clutches. >>

If you'd attribute this to a wild snake it would make sense that a female produce more young during years of plentiful prey, and double clutch, and less during years of light prey availablility. Sort of a natural population control. Just a thought.
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Ace