who separates there mice according to colors to keep a stock of pure colors to work with i keep my albinos separated then masked with masked or oranges with oranges this way when lines do start to feign i throw a female of each color in with a male of a different color so once all are done this way it gives it seems a contrast to what was there reinvigorating the stock or so it seems
also how long do you guys use a male as the father for till you replace him i use mine pretty much till they die (no i don't keep the male breeding hard core to the end) but once he don't seem to want to get all his females pregnant in a month i drop the number of females down in his cage to less so as he ages he still gets to breed just not as much as he did in the beginning
also who separates the pregnant females out to a cage for them to have the babies with out being bothered by the male