I have seen posts about how to choose a good laying hen but haven't seen one about how to pick the best rooster... I have 23 pullets that will be laying in a month and 4 cockerels that are about two weeks older than they are... how many roosters do I need to keep? If I decide to get rid of two of the roosters what criteria should I use to choose the "best" ones to keep? All 4 are nice looking but 2 are a little larger, is size important? Would keeping all 4 of them put too much stress on the girls?