I plan on free rangeing my chickens on about 3 acres. I have a coop, will have feed/water/oyster shell available in the coop at all times. my question is they will be sharing my pasture with two horses, I have read numerous posts about hay causing impacted crop. when I feed the horses hay and alfalfa, out in the pasture will this be a problem?? my dad told me their chickens were always in the hay barn when he was young and was not a problem. Is the difference that they are not confined in a coop/run but allowed to roam free?