Q: Are the color of a hen's eggs determined by the color of her earlobes?
A: Not exactly, although ear lobe color seems to be related to egg color most of the time. Breeds with white earlobes usually lay white eggs... except for Penedesencas and Empordanesas, which have white earlobes and lay dark chocolate colored eggs. Chickens with red earlobes usually lay eggs in shades of brown... except for breeds and varieties like Easter Eggers, Ameraucanas, and Araucanas, which lay blue or green eggs.
Then there is the Silkie. The hens lay light brown or nearly white eggs, while their earlobes are blue.
Check out my lobes!
So ear lobe color is often related to---but not determined by---egg color.