chicken sexing - Page 2
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There is always a chance that a chick was missexed. Vent sexing is done by people, and as such, there will always be degree of human error. A bright pink/red comb by 10 weeks old means cockerel. Most boys are obvious much earlier, but every now and then, a cockerel will take long to develop.
Feather sexing only works under a very specific set of circumstances. Most chicks can not be accurately sexed by feather development. If it were that easy, nobody would ever end up with missexed chicks.