This morning, i noticed one of my hens not acting her normal self. Her name is Berta. When i let my chickens out of the coop to clean , she stayed behind and kept to herself. I noticed she has diarrhea and a fever. I was told to give Tylan 50 by injection but it comes in this big bottle. Does anyone know the correct dosage to administer? This is Berta. Her feathers are fluffed and i have checked her upside and down and thought she had an egg stuck. Thats not the case. She is now separated from the rest and is inside in a separate cage.