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I'd think they could genetically engineer the egg layers to only produce males in certain conditions (such as when they're incubated at a higher temperature), then only breed males when they need more roosters.
OR, if sex is selected by sperm type (as with humans) artificially inseminate the hens.
I suspect there are dozens of valid technical solutions that are cost effective and would allow them to not shred male chicks.
Every vegan initially dreams of a world with ethical meat. Then after a few years you realize you actually don't miss meat at all. Please believe me when I say, ethical meat really isn't worth the effort (and often mental gymnastics).
Did they use the chickens for something? I guess cat food or something like that would be useful.
Chicken nuggets are made this way.
Didn't they use the bones and cartilage for that?
Chicken lips and hooves.