Thanks everyone for your info and advice. I was encouraged to give all my chickens colloidal silver in their water for a several days to see if that cures the one chicken that is laying the lash egg. At least we can continue to eat the health eggs. If I gave them all amoxicillin then we would...
Layer feed is Purina Layena High Protein; the flock eats some cluck&co. organic scratch and some cracked corn. They are all free range chickens on the property. Treats are mealworms and maybe some watermelon when it is hot.