development, as will it’s wing feathers. By day 18, the chicken should have significant feathering, and by day 30, it will have developed the characteristics that identify it with its breed.
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Unfortunately many young roosters are discarded as soon as they can be sexed- especially if they were being bred for egg production. Some may be kept and raised for meat, or to produce the next generation of chickens, but for most this is not the case.
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