The group pictures seem to be winter pictures and I imagine they have a short season of laying because they are in Canada. It is recommended to separate a full month and I stand by that belief because I have had mixed babies still at around 30days from separating. Before I made a run for each breed I would sell mixed babies from test runs pulled at the end of the 30 days and still see some mixing. People that think a couple weeks is enough or people that just pick them out based on looks and assume they are pure need to rethink that. Some baby patterns are very strong but they don't end up looking pure when adult. Appleyards are a good example. Babies with a cute dark mohawk may be pure or may not.