We have a blue Copper Marans rooster who has been kept in coop with 3 sex links for over a year now. However, we would like to move him with 2 full grown Cream Legbar hens and our 4 blue Copper Marans pullets. As next spring we plan to breed them. The Marans Are 19+ week old pullets. Are they still too young to be placed with a rooster? Thanks!