I have a new flock at POL and 3 of 5 are laying. My old flock layed beautiful orange yolk eggs and my new flock is laying yellow yolk eggs. Could it be that they are not getting enough greens? They free-range very little because I lost my last precious chickens to foxes. I'm really worried about losing them so I don't let them out unless I can be there to protect them. I also changed the layer feed brand with the new flock. Do you think it's because of the greens (or free range time - 1-2 hours) or the new layer feed (Purina).