In tending to my chickens today I am uncertain if what I saw was them showing signs of cocci or just cold. I let them out to play in the yard earlier than usual temps were abt 56 degrees and one was puffing up, still moving around fine, interested in food. Otherwise normal behavior. So, i decide just in case to go get some corid so I have it. Get back and no puffing up from any of them but my big olive egger roo is now laying down as if to take a nap and puffed ever so slightly as he tucked his head. I never see them during the midday so I am not sure what is normal or not. Should I run a course of the corid to be safe or am I over reacting? The olive eggers are 6-7 weeks old and the sebrights are 9-10 weeks old.