I have been breeding this beautiful flock of Asils (Kulangi Type) and started with a few eggs from Iran and slowly improving their quality. I had some amazing 36-38" tall roosters, and about 24 chicks that I hatched this year. They are all kept in a nice area in southern california in a very clean environment. About two months ago, my two largest roosters became suddenly exremely week, and dropped dead with 1-2 days. I noticed their poop was white (like a chalk). Then the same leg weakness and death pattern continued to some of my 3 month old chicks. It affects the largest animals more than the little ones and the male to female ratio is 3:1. The other chickens all look healthy and playful and have no signs or symptos yet. All I am noticing is white poop for a few days, leg weakness and limping followed by leg paralysis, despite good appetite all the way to the end, followed by death. So far I have lost about 8 of my animals. Two of my most beautiful stags have stopped walking, and lay on the ground, but continue eating and drinking plenty. There is no major diarrhea, no respiratory distress. I have prepared a styrofoam box to ship the next dead stag to UCDAVIS lab to autopsy. Any idea what might be going on? Have you ever seen anything like that before?