Hi Beth, Culling is the art of the breeder and unfortunately there is no exact formula. Generally, I like to go about things as follows:
1. Look for body problems (ie. knock knees, wry tail, squirrel tail, split wing, any deformities)
2. Look for items that are wrong for the breed (ie. incorrect leg color, no muff, comb that is not a pea, severely over or underweight, maybe too leggy)
3. The hard part is now to look at all the \"minor\" problems (ie. off color blue egg, white tipping, slightly large pea comb, not as full of a muff as you would like, eye color issues, somewhat off on weight, etc.) and sort them out. Depending on their flock, different breeders will decide to keep different birds. You have to look at what you have now, see what is not good about them and choose birds to breed with them that will improve what you don\'t like. You can\'t tackle everything at once so you will have to prioritize. As you get your first one or two problems under control, move onto another one or two. Being a patient person is very helpful!