I put a drop at base of neck and a drop above the vent. I just had to do this last week (my DH did it for me). He had noticed egg production had plummeted and I told him to check for mites. He brought one of my orpingtons for me to check, and sure enough, I saw a few. He took off work the next day and treated them all. This week eggs are up from a low of 2 to 20! It really does affect them negatively. He also treated all their housing, perches, nest boxes, changed their litter and treated the sand on the floors. I think you have to do it all in order for it to be most effective....
Angela
Angela