He is about 5 months. He just got over coccidiosis and we just wormed him with cidectin. Eyes look good. Great hay have not been graining him free choice minerals. Our females look great. Him on the other hand we cannot seem to get him to gain anything. He looks so skinny
I would give him a copper bolus, and a selenium and vitamin E supplement (selenium and vitamin E is most commonly found as a BoSe shot, or gel)
Multimin 90 is a good supplement shot as well, it covers a lot of minerals.
I would start giving him a high protein grain and work him up to about 2lbs of it a day. 16-18% protein is good. Have a fecal done to make sure he isn't still battling with a load of cocci, and worms. If he is, treat accordingly.
Does he seem healthy otherwise? Good appetite, everything functioning normally, no runny nose, etc?