My boyfriend told me about this a while back. He'd read somewhere that technology is being developed that can actually determine the sex of the chick in the egg (I'm not sure at what stage of development this becomes effective). That way any unwanted males can be disposed of before they even hatch, so they're not ground up alive in a macerator. Apparently the public is beginning to find out exactly what happens to male chicks, and there's been some pressure on producers to find a more humane solution.
I agree with other posters that if you don't have a plan in place for any cockerels you hatch, don't let any eggs hatch!
I am very much for animal welfare and whilst the idea of a chick being ground up alive in a macerator SOUNDS horrific, it is not inhumane as the macerator is huge, spins at several thousand RPM and reduces the chicks to pulp in a nano second. They certainly wouldn't be aware of it. It's certainly more humane than the rest of the chick hatching and sorting process, where they are thrown around all over the place while being scooped out of hatch baskets, sexed and conveyor belted around the hatchery, possibly de-beaked, with some getting accidentally dropped, caught up in machinery, beaks trimmed too close and dying from shock etc.
As a public, we need to be careful when we insist on things that SEEM more humane but potentially are just more aesthetic, yet no better for the animal.
Unfortunately, slaughter is never nice. I have culled chicks with dispatching pliers, sharp scissors and CO2. The CO2 was the most aesthetic and the least emotionally difficult for me but I'm pretty convinced the scissors were the quickest and kindest, despite the mess, so that is how I will do it this time. We have resident buzzards so the bodies will go out in our paddock for the buzzards to snack on.
I have culled adult birds with a dispatcher, the broom handle method and decapitation with a butcher's knife.....again, the messiest method, the butcher's knife, was definitely the quickest and kindest. All methods had me sobbing like an idiot and shaking like a leaf but like you said, if you don't have a plan for the cockerels, don't hatch