Could Incubation Temperature be a variable in how genetic stripe turns out?

I know a guy who bred a nice pair of genetic stripe and the first year all the babies had lots of side pattern and breaks. The next year the same pair produced a clutch where all the babies where much more striped than the previous year. If we where talking one or two extremes in each clutch here it could well be genetic variation but with the same parents and the two totally different clutch results I'm wondering if some environment factor comes in.

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