Most of my chickens are BOs but I have one EE and her daughter who is EE/BO. I have noticed that even with the freshest of eggs the whites from the eggs of those two hens are much thinner. They fan out in the pan like an old egg, and this morning I was poaching two just laid eggs and it was like pouring water into the poaching liquid, and then the yoke just dropped right out of the whites and became a separate orb in the pan. These hens free range, get layer crumbles, scratch grains, sunflower seeds and various treats. One hen is several years old and the other just started laying this fall, but they have always been this way to a degree. The eggs from the BOs are just what you would expect from a fresh egg, nice thick whites that stay together. Any ideas on what might cause this?