I have 9 huge pens for the breeders. Smallest is 10x10' and largest ones are 10x30'. I have 2 4x8' and 1 8x8' brooder. All are kept on deep sawdust. I also have 2 rows of hanging wire rabbits cages for quarantine and separating cockerels off. Sexes are separated unless during breeding season. All cockerels are pulled from growout pens as soon as sex is known. Keep a high enough percent protein and same sexes together and you won't have to worry about feather pulling. Amy