I forgot to add. After a male breeds a female she can retain the sperm for 2-4 weeks and fertilize all the eggs laid over that period of time. If you want to keep a pure mix you need to collect eggs 3-4 weeks after you put them together. Most say the female is clear after 3 weeks, but to wait 4 weeks to be sure, especially if you are selling eggs. Most folks just keep the breeding pair or group together for the whole time you are collecting hatching eggs to ensure the highest fertility.When you have different breeds how do you go about mating. I find have to worry about that yet. At the moment I have my 2 boys in a bachelor tractor and the others are still young. Do you all have a pen for separate breeds? Do you do individual matings? If so how long do you keep a pair together? For example with my asian blues I have one girl and 2 boys. One boy is very aggressive and he will be dinner as soon as Jay gets a day off. So I would put the girl and boy together for how long. When is the first egg fertile?