Might I suggest this book that has been an invaluable tool for me over the last 20+ years. If you will take the time to learn the material covered within this book. Mainly the portion dedicated to identifying and treating diseases. Your friends and contacts will believe you are a living "Chicken Guru". It's very easy to read and understand. You will soon be able to just walk by a pen and tell by just a quick look, right away if anything and what is troubleling your fowl. Time is your enemy when treating sick chickens as many of the diseases are airborne and can quickly spread through your flock. It will be the best $20 to $25 dollars you will spend this year!