It started yesterday with one hen who was coughing and had lots of yellow thick poop stuck to her back end. Now quite a few of our 35 hens are coughing and have runny poop! they are normally free range during the day, but it's been cold and snowing lately so I've had to keep them in the coop. When they try to make their noises, it's like they are choking on their noises if that makes sense. We just gave them electrolytes and we will out fresh bedding in tomorrow. We also have month old chicks in the same coop,'but where they can't contact the hens. Should we treat them as well? We just started up our flock a few months ago and are brand new to chickens. Any help is very appreciated!