My Campine hen is about a year old. She acts very healthy but has not laid any eggs and has very loose stool. Her pen mate is a Sexlink that is completely healthy and lays every day. What do you think it is and what should I do? I took them from the farm flock to the city about a month ago as I wanted a few for my sub division back yard. The diarrhea in the Campine does not seem to be "caught" by the other hen and they have been close together for a month. Should I treat them both with Corid ?