That does bring up a couple of good question as to proven lines.

1. By "proven" does the breeder mean having produced an Ivory?

2. How foolproof is the process of picking the yellow bellies from the non yellowbellies in a clutch even with a proven line?

I got to help sex a clutch from yellow belly X yellow belly that included an Ivory last summer. There was one ivory and some really nice yellow belies in the clutch in addition to normal. But there was one that had some but not all of the yellow belly traits. Was it just a normal for the yellow belly gene that just happened to have some yellow belly like characteristics or was it a genetic yellow belly that just happened to be to the normal end of the yellow belly appearance spectrum? I was really tempted to make an offer on it because I thought it probably was a genetic yellow belly but if I where the seller I would be afraid to sell it as such just in case it was a normal.

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