I bought Chukar eggs from a seller in N.C. who wrote me back and said;"Yes, when they mature you will notice a large knot on their leg. This will be the male. The knot will be about the same place on the leg as a spur would be on a chicken or pheasant. Hope this helps."
This sounds easy, as compared to traditional venting methods. As mine grow I will try this and be back with my results. Ghost