We live in southern Michigan and it has been a very mild winter here. My horses stalls are open to a paddock which opens to their pasture. They are out 24/7 all winter and summer once the spring rush is over. I've just recently cut their time back in their pasture because the grass has come on strong. I've brought them up to about five hours per day and my pastures aren't that lush. I'm wondering if since my horses were actually grazing all winter would it be safe to just let them go all day long?