The male does not matter as long as he is sexually mature, which means he is able already being 2 yrs old. The male body weight/size does not matter as long as he produces viable sperm.

In captivity it is best to wait until females are grown up to their adult size and girth. Feed them heavily prior to mating. In general with snakes like that, food = energy = ability to produce babies. Make sure females are well hydrated too while gravid. Humidity levels should be adequate, or offer a humid hide. Make sure to give the females a large-enough nest box well before they are scheduled to lay.
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Mark

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• breeding length and weight for nelsoni? - Hognosedude11, Wed Sep 7 21:48:45 2011
• RE: breeding length and weight for nelsoni? - markg, Fri Sep 9 18:41:41 2011