My hens free range all day in my horse pasture. It's partly why I have chickens - they help a lot with keeping the fly population under control! My vet recently told me to go back to worming the horses seasonally - before this, I've just been doing fecal egg counts instead. My hens scratch through the horse manure - will worming the horses hurt the chickens? Should I keep the girls in their house for a few days after I worm? If so, how long? I'll be worming with moxidectin in spring, and ivermectin/praziquantel in fall. I apologize if this has been asked and answered - I did a search first but couldn't find anything.