I've never had to cull before. Always let mother nature do it..... I had to restart my flock after a coon attack.. so i've got 5 week olds that just went to the coop out of brooder.. 1 of them had a broken leg that healed crooked.. she made it around the brooder o.k... but she's not gettin around so good out in the coop...... she just ain't got the strength to get up n down ramps etc.... the wife has been babying her for a month and hasn't let me do the deed... guess i'm gonna have to do it when she ain't home..... i know she'll be upset, but to me the bird is struggling...... what do you guys think....