one pheasant lives about about 50 pheasants have been saved for breeding (many were A&M cortunix or weak ones that crowed so i culled them). i want to increase this stock fast and maximize number of females. to minimize the number of brooders i'd like to combine age groups. meaning four week old with six week old. or, in the future, combine six week with eight week. can i do this? or will the older ones tear up the younger ones? what is the max number i can have in a 2'x6' breeding pen?