I have 1 Cuckoo Maran and 4 GLRW Roos that are about 13 weeks old. When will they be full size so that I can manage them right into freezer camp? I want them to really be full grown so as to gain every ounce of carcass possible. Also, how will 14 month old Barred Rock Roos be for a cookin'. I've 2 of those that will be going to camp, as well.