Hi, So, I have tried to read through all the threads, but there are so many posts that don't exactly answer my question. Maybe one of you can help? I was told that I could use the Ivermectin sheep drench at Agway, to put drops on the girls. They are full sized hens and 2 guinea hens. My questions are...how many drops? Do they get mixed with water first? How long do I have to toss the eggs with this approach? thanks SO much because the guineas and 2 hens have stopped laying completely. I see the flakes of white in the poop, and little feathers everywhere. They are happy and active otherwise. thanks,!