We have had our self blue Duccles for about a year. Last month we noticed one that was behaving abnormally. She tucked her head low between her shoulders, didn't eat as much as normal. Within a day or so she would stretch out her neck and open her mouth to gasp for air. We brought her in the house and kept her warm and researched to find the issue and resolution. We didn't find anything certain. She died the next day. Now we have another one that is displaying the same symptoms. It sounds like a respiratory issue to me, I think it is pneumonia, but I am not a vet. The vets in this area do not treat chickens, only large farm animals. No new chickens have been introduced. Will anti-biotiotics help? How much do I give her? How long before we notice a difference. I have penicillin. I don't think that we have much time. I can tell she is thirsty, but it seems to choke her when she drinks water. Again the straining of the neck and gasps for air.