Hi! We have some red star young hens that are now laying medium-large eggs. I have noticed that most of their eggs are fertile, looking at the germinal circle. The rooster that they live with is a RIR rooster. We plan on selling baby chicks to a guy at the local feed store, because he knows someone who wants some baby chicks. So I have been asking around about what to charge per chick. Decided that around $1-$2.50 sounds fair. But sense we are gonna sell lots of chicks, we should find a way to tell their gender. Yes, I know that Red Stars are sex-links, so we can tell their gender very easily by looking at color. But would we still be able to tell gender by looking at the color of the chicks if they were mixed with a RIR? Thanks!