I have 3 chicks that are now 7 weeks old. Mama is Black Australorp (but didn't lay any of the eggs) I have Australorp and BO hens and a BO rooster. 6 weeks before the eggs were layed i culled 2 SLW roos (they were mean). 1. Can you tell if they are pullet or roo? 2. What mix each one is?