For about 2 weeks my hens have been laying eggs that the yolk is very pale, worse than store bought eggs!!!! I have been giving them some green stuff when i can find it. They are free range to, but the grass is burned up due to it being 105 for 4 weeks and no rain. When they first started laying they didnt get as much veg. and the yolk was orange. Can having worms cause pale yolks?