As the others said, they are all pullets. I know the BR is for sure, easier to sex very early on than others are due to color cues, as are all the barred varieties, including Cuckoo Marans and Dominiques.
http://www.dominiquechicken.com/Sexing_Dominique_chicks.html
http://www.dominiquechicken.com/Sexing_Dominique_chicks.html
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