I hatched some of my own flock. I was advised in a poultry genetics group that a non-barred roo with a barred hen would create a Black Sex Link. The chickens involved are as follows: Rooster - Speckled Sussex Hens - Barred Rock, Black Australorp, 2 Red Sex Links, Easter Egger, and Dark Cornish Given that information, the Barred Rock's chick should be a sex link and the only other bird that should throw a black down chick would be the Australorp. Subject #1 Subject #2 These chicks are 6 weeks old now, but can I please get opinions from others on which of the two you would think is the sex link? Both the eggs were laid on the same day and I only have one of each type of hen.