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The one I know of, does not. It looks like genetic testing for chickens is a rather new thing, and there hasn't been enough demand (yet) for anyone to develop very many tests. If someone develops a test for one specific trait, using it can be faster and cheaper than doing test-mating for that...

It could go either way. If it caused by a recessive gene, about 2/3 of the normal chicks would carry it, and 1/3 would be free of it. If it is caused by a combination of two or more genes, the numbers are worse (even fewer chicks that are free of all problem genes.)

I poked around online a bit more, and some breeds of chicken DO have higher riboflavin needs than others. For example, this article has a chart near the bottom, showing that breeder hens of broiler breeds need a higher level than breeder hens of most other breeds...

That was my point: the diet that is fine for the others, might not be fine for them. There ARE some breeds of animals that have different needs, compared with others of the same species (I know I've read of it with some breeds of sheep, and I think some dogs as well.) This specific color of...

You could look into dietary deficiences, and give those parent birds some supplements. They may need a higher rate of some vitamin or mineral, compared with what most other chickens need. (If they do need a higher level of something, you will have to decide whether to provide that to them all...