Yes...that was one of the theories listed in one of the old reference books but I think it was the Aristotle method of reasons and not the Galileo (i.e. a possible explination, but not testing to ever proove it out). If there was any hard data on any of this stuff I think the hatcheries would be using them. I guess all we can say is keep hatch records and if you find any corrolation let the rest of us test them out too.
Hatch a lot from them. They aren't there yet, but look better than what I started with (and some of what I still am working with) and show the potential to produce some good offspring.

EDIT: Meant to "quote" RobNorman's pictures. Sorry.

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