I was always told not to turn ponies out on the frosty grass and have never done so but was wondering is it really going to cause lami or colic?? What about the ponies that live out 24/7. Mine are stabled overnight and we turn out around 7am if we don't do it then they have to stay in all day with just a quick turn around the concrete yard. Would be better if they could go out but with the weather we are having at the moment the field has been frosty yesterday and today. Any advice please.