As a breeder you must hatch alot and cull down or sell the rest to keep the best to better the breed. You don't just hatch 10 then cull 8 at a day old. That's no way to be a good breeder. It takes at least a year and a half better 2 minimum to see what you have.
Mostly agreed, except for the age part.
I'm working on a couple breeds, and we don't need to keep all the boys that long. As they grow traits are revealed in stages. The first to go are the buttheads. Next are the undesirable tails, leaky colors, poor beards, etc. For example, one project yielded about 20 cockerels this year. I kept 3 past 2 months old. At 6 months one showed leakage, so he went. Now it's down to 2 in that pen. I'm pretty sure which will be the breeder, but the final decision is hard, lol.
In that case, a predator did get it.
You're the funniest!