my chickens are dying! they were fine last night and now today i have found 3 dead........2 wfbs and my single st. wht cochin. There ARE More that are looking horrible. head hangin, lethargic. i am noticing blood in diarhea. most affected are my pullets and a few cockerals. they are now almost 3 mo old. there are no swellings, injuries. i have wormed them. i have only these chickens together that i got all at one time as chicks. they were vaccinated too. the only other birds i have are turkeys which are no kept in the same area. as far as i know they have no been exposed to anything. geeshhhhhhhh...........anyway, any ideas? they are under shade so they arent getting too hot. i did switch over to pellet in place of crumbles this past week. that is about the only chg i can think of. what the heck is going on?????? if i lose these birds i will not be doing this again! thanks all and i hope i post this in the right place.