What is wrong with this hen?
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How old is she? Is that blood in her droppings or does it look more like intestinal shed? Her droppings look runny and yellow. Cocciciosis might be a problem, but it would be good to share a few more details about how well she is eating, drinking, and anything else. Corid (amprollium) is a good treatment for coccidiosis. Dosage is 2 tsp of the liquid, or 1 1/2 tsp of the powder per gallon of water for 5 days.