My #1 rooster started crowing at about 3 months, give or take. I had noticed that the "hen" Dominique looked every bit as large, with huge feet the same size as his. I worried that she was the same size, and had a much larger comb than the other hens, but those 2 are the only dominiques i have, so no frame of reference. They behave basically the same as before, not the most friendly of all my chicks, but certainly no shrinking violets. The first rooster started crowing over a month ago, so I assumed that #2 was a hen. He showed no signs of aggression toward the hens, as #1 has, so I had no reason to believe he was a rooster.(They were sold to me as pullets, and all the others seem to be so).
Dom chicks are sexable at day-old. See http://www.dominiquechicken.com/Sexing_Dominique_chicks.html to view the sexing of male and female Dom chicks. Someone didn't want their cockerels amd sold them off as pullets to you. Any Dom breeder would know the difference between male/female chicks. I'm not a breeder and can tell the difference in the feed store if a Dom is a pullet or not.
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