Originally Posted by usandpets
Round bales can get moldy if they are baled and the hay hadn't dried enough or is left to sit in water. Also, round bales are usually dustier than square bales, which is bad for their lungs, especially if they have heaves or allergies. You can feed individual horses with a round bale but it is difficult and messy. I think for indoor feeding, square bales are easier to store and use. For free choice feeding and outdoor feeding, round bales work better. I think you get more hay for less cost with round bales, but I could be wrong.
Sorry. Rounds are not MORE dusty, it's just the physics of the situation. Horses bury their nose in the round bale and breath in more particulates.
It is also not difficult or messy to feed small portions off of a round bale - if you have a good hay supplier that makes nice tight round bales.