Ah, can't have any crowing....I usually slaughter layer breed cockerels 12-14 weeks, crowing but before they gt too randy.Since I have to disperse one way or another any unwanted roo before serious crowing, I have to kill layer types before they are table ready, generally 7 weeks or so. (Meat birds can be ready before crowing, but I work with more heritage designer types).
Have used CO2 on week old male chicks for raptor rescue feed.
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