I recently moved my horse to a new barn where the pasture boarded horses sit on very lush green pasture and during the warm months are only fed grass. I brought him from a barn that had 24/7 round bales, and over a week weaned him onto being grass fed all the time.
My question is, what concerns should I have about grass feeding him? He hasn't developed a crest yet, and his massive hay belly from having free choice hay has gone down. He also has a ridiculous amount of energy, but I don't know whether to chalk that up to moving him, him being on grass, or possibly switching grain. I had him on Purina lightly to moderately worked horse feed to special diet safechoice. I stopped feeding the purina because it was sticky and obviously sugary, which he doesnt need.
I supplement with pelleted vitamins, a joint supplement, and a pelleted hoof supplement. For the first week at the new barn I had him on probiotics because he's got a sensitive tummy. Is there anything else I can feed him? Something I can feed to help him stay calm? I like the safechoice I have because it has probiotics and trace in it, but I'm open to suggestions for a different type of grain.
Any advice would be great.