I breed Japanese Bantams and various Fancy pigeons.
I am lucky that I don't usually have to cull.. because I sell my birds at pairs.. one male and one female.
People like the Japanese Bantams for the beautiful roosters, rather then the hens for egg production.
And the fancy pigeons as always sold as mated pairs, again, as the buyers want to breed their new birds.
Maybe choosing a different breed will help you not to have excess roosters?
However, I do sometimes have a terminally ill bird, or a deformed one.. and I have to cull them... which I still hate doing and feel very guilty about.
I keep numbers down to a minimum normally and know how much space I have to avoid overpopulation. Plus the birds are easier to keep clean sndn are less stressed in low densities.
But as the moment I have far too many king pigeons.. they are beautiful white birds and very friendly. I was let down by someone who asked me to breed 10 pairs for him to start a pigeon farm. So now I have those 20 birds plus the 8 birds that are mine.
Now I can not find anyone who wants them... and they are costing me a lot as they eat so much! They are using up space so I can't breed my other fancy pigeons.
I am faced with having to cull them... which is such a shame..... and killing tame trusting white doves is just about the worst thing I could think of to kill!!!!!
I have been putting off doing it for 2 months.. but soon I know I will have to do it.... I wish I could eat them.... but don't know how to properly butcher and process them! At least if my family ate them it would not seem a waste of their lives.
Despite our best efforts and intentions.. things go wrong.. and we have to be responsible for our birds.... its all part of being a good breeder and caring about our stock... which often become like extra family to us.