I am intending on breeding my own chicks, not having to depend on a hatchery to supply my birds. As a result i will be breeding 4 or 5 different types of birds. I currently have 4 RIR roos and am curious in the qualities that I should be looking for in the one that I am goinf to keep. I don't care if they are mean or nice to people since they will be housed differently than my hens. My main concern is what I should look for in the breed standard for the best bird to keep. I am sure it will help to say I also sell eggs to friends of mine and and am looking for hearty layers for my hens. last question is how old are they going to be before they are old enough to fertilize eggs? Mine are at about 5 months.