>>I have two pair of adult bulls that are breeding age - I stick in the male, he goes wild over her, but I never see any copulation. Any idea why not? I usually leave them in for a few days - I usually watch for a few minutes at a time.
The males do tend to be aggressive breeders, but I never saw that male breed for the first two years he gave me offspring. They'll copulate for 15-60 minutes, but I think the females will resist for a long time. Often, I'll leave them over night together when they are courting vigourously.
Have you got good eggs from the females yet, or is this the first year you are trying? If the female is not receptive, she may not be ovulating (too early or too late) or too young/small. How big is she, and how long has it been since you warmed them up from brumation? Have the females shed? If so, when - and how long after brumation was it?
KJ
KJUN Snakehaven