Although this thread is old, I feel I must agree with the last poster. For 5 months now I have been losing chickens to what I thought was Merkel's disease. However, the hens and one rooster seemed to get sick at different times, and usually when we have disease come through here it comes and is gone in a month (Eg Chicken Pox) Then someone on here said, what about poisoning. I made enquiries and yes, this product was used next door to kill cockroaches. My chickens love the dead cockroaches and have been eating them for over 9 months. It is painful to watch them die. I have left them as some seem to make a partial recovery even being able to rear chicks. None of my small chickens are affected. My feeling is that they cannot eat the large cockroaches that we have here.