I have had this problem too not knowing if it is the male or a female. I just did my last hatch of the season and 2/3 of the eggs turned out to be infertile. I am thinking that here maybe the heat has something to do with it because for over a month now we have been pretty much in the 90's every day. I have been putting on the sprinklers I have set up in the pens. I'm even standing under them to cool off.
I don't think it's so much the heat. Could be but would think it would effact the brahmas more. But all good in that camp. Lol. Have brahma chicks coming out of the butt. Hahaha