We have had one of our beautiful hens die this week. So sad. And now our gorgeous baby silkie cockerel is very poorly. He hasn't even got the strength to stand. He has eaten and had some water, but he is very lethargic. Our birds are all free range. They sleep in a big hen house at night and come out every day. Our cockerel was growing up and just about to crow; he has tried a few times. Now he isn't doing anything at all. Our hens were twitching and when we looked closely we found they had lice. We have treated them all for lice using poultry lice powder containing permethrin. We have used this powder before and it cleared the lice so we were confident to use it again. This time we had some of the powder left and we started the three-week course with this. For the first two weeks we used this powder. (The powder was pink). For the third dose we bought a new pot that looked exactly the same and was bought from the same shop. This time though the powder was grey and it smelled different. The birds were taken out of the hen house and dusted one at a time outside. They were then left outside to run around as usual. Within a couple of days the hen and the cockerel weren't the same. The hen then died and our cockerel is very poorly. It seems as if the powder has casued the problem. We will take the little cockerel to the vet tomorrow, but we were wondering if anyone has any ideas of what we can do? .