Raul is right I have found out that the male stimulus of breeding and courting females helps females to develop large follicles. I would recommend breeding your male to your female every two and half weeks at least once to help ensure that she takes.

On the other hand I just got back from Vegas on Monday night and I checked my snakes and I had a female that was starting to lighten up and she looked real good. I checked my records and found that she hadn't been breed yet by any male. So I threw one in with her and bred her that night. I checked her today with the ultrasound and she has 28mm follicles so I looked out. She might be one of those females that you breed once and then they lay!

Brock