Our compost pile is within the chicken run (half of the run is filled with ~2ft of fall leaves + some kitchen scraps). Would it be a bad idea to add some horse manure/bedding to the pile for the purpose of helping to compost it including eliminating any residual seeds and to use it in the garden coming spring (plus some free chicken feed)? My concerns are: 1) While I understand chickens do often leave with horses/cows on the farms, will bringing horse manure on purpose increase their chances of worm infestation compared to an isolated flock? 2) While the stable owner said they don't use any medication not sure if she meant "not even dewormers". How bad is it going to be if the chickens by chance get access to manure from a recently dewormed horse in terms of their own health or us eating their eggs? From googling I see deworming every other month is pretty common, so the chances of getting some of that manure is pretty high.