Before I separated roosters I just waited until they were up for the night and did a quick head count. If I got the wrong number I counted by breed. Now I go out and count what I have separated into a rooster run. There are 21 in there, and I wouldn't be too upset if something ate the evil barred rock roos, so about once a week I count, and if they are there I don't worry. Then I have 13 chicks and 2 keets in the brooder pen, that I do by color. Then I have the more secure coop and run with my pullets and one rooster of each breed that I would like to keep, that will eventually be separated into breeding pens one of these days. They get counted by breed and I don't leave until I get the correct count every night.