Jersey Blacks are a breed cross using Rhode Island Red males and Barred Plymouth Rock females. The male chicks have a white spot on the top of their heads and can be separated from the solid black female chicks when they hatch. They are efficient producers of large brown eggs. They have excellent livability, and hens from this cross weigh about 5 1/2 lbs. They feather out mostly black with red feathers around their chest, neck, or back. They are known to start laying earlier then other standard breeds.sexed to 99% accuracy. Only females sold unless otherwise noted.