Hi I had 25 broiler chickens They're about one and a half month old. 5 days ago I have noticed that they had some respiratory issues, they had been sneezing. I went to the pharmacist and he gave me several antibiotics to give them. One of them is erythromycin I think. Yesterday, one of them has died. Today, I've found that all of them are never moving. They're only laying on the ground but never moving. I gave them their feed which mostly looks like this; http://www.dansdata.com/images/blog/chookpellets1280.jpg Afterwards, they layed on the ground and never moved like they used to, It seems like they're pretty heavy for their legs. I don't have a clue whether that's pathological or not. The room temperature is about 34°C. Their noses are runny, I get their food and their water changed three times a day. I have fears that they may all die. Help?