BlueTheBrahma
Songster
Also would like to add that this would not imply avoiding these parents which throw both colours altogether, but aiming to replaced them when it seems sensible with a correctly coloured replacement bred from two correctly coloured parents.I believe (though I don’t know eye genetics in chickens) that eye colour is similar to variation in the shade of brown eyes in people, controlled by many genes. Unlike blue vs brown which is one gene, the variation in shade is more complex. A bit like egg shade colour etc.
So I assume it’s good old fashioned selective breeding, culling bad progeny and keeping those with correct red/orange eyes.
Someone correct this if it’s wrong.
I’d be interested in seeing what percentage from each crossing had dark eyes, to try and see if there is a single gene or at least understandable set of genes responsible.