I have a dozen hens and a rooster. I started noticing brown runny poo a week or two ago. Now it's like all I see. My hens are eating well. No symptoms other than the feces that collects flies. Is it worms? a disease? Everything I read about I think they wouldl stop eating or become lethargic. These hens are acting normal.
brown runny poop
Can you post photos?
Chicken poo can vary greatly. Cecal poop can be runny and stinky to a bit firmer and stinky depending on what they are eating, weather conditions (consuming more water in warm weather) etc. You will see some "runny" cecal poo about 1 out of every 7-8 poops.
I'm in no way dismissing your concerns, but if you are experiencing warmer weather, the cecal poo can become a bit more watery, because of water consumption and of course more flies as well.