I am in the process of hatching eggs. So far I have hatched 6. 3 were yellow 3 were black. The father is a barred rock and the mothers vary. Golden sex links, white leghorn, RIR, buff orpington, easter eggers and more. I asked about sex-link with barred rock rooster before and people said you can't. I am not saying they are wrong but what could cause all these mixtures of birds to only form black and yellow chicks?