So.... I've never kept a rooster before myself and I'm helping a good friend with their mix flock of young pullets about 5 monthd old. There are White Leghorns, Barred Rock, Ameraucana, Comets, and Ancona. Among the flock, we ended up with 3 young ros. So 13 pullets and 3 roos. One is a RIR, one is a BA and the last roo is a Bantam Cochin....he is a cutie. How old do the Roos have to be before they are fertilizing the eggs? I see them starting to try to mount. Will the standard size Roos her the Bantam Roo as they become older and more dominant over the flock? Anticipating that the standard size roos may hurt the bantam, we are setting up a separate coop for him and 4 Bantam Cochin pullets we just purchased. Are two roosters sufficient to fertilize a flock of 13 hens? In general, will the Roos be aggressive towards us when we tried to feed the flock? How can we make friends with the roos? I will stop here. Thanks in advance for your answers and feedback.