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there's lots of reasons. mostly because it's ill, or is being fed the wrong feed. sometimes but rarely roosters are just born and never crow. throat damage in a fight with another rooster too. the other day i was reading this chicken book the other day and it also said that a rooster can strain it's voice, and this usually happens in a crow-off with another rooster. sometimes other roosters will crow more and the other one feels pressured so doesn't crow, which he can lose his ability.