HI I am trying to put some weight on my 11 yr old 16hh paint gelding. He is fairly thin, i can see his ribs and his hip bones seem prominant. I have had him 3 weeks now and slowly introduced some other feed in addition to the hay he was getting at the previous owners. He now gets free choice hay, 2 hours of green grass turnout, 5 lbs of nutrina safe choice, 1 lb of 12% sweet feed, free choice buckeye supplements, and 2/3 cup of canola oil daily. He is used very lightly maybe 2-3 hours a week if that. His coat is shedding out nice and he is getting shiney but I really haven't noticed much weight gain. His teeth have been checked and the previous owner said she wormed him just before I picked him up but because he had worms in his poo a few knowledageable horse people told me to worm him again using different kinds of wormers so i wormed his with quest and 2 weeks later with panomec. The previous owner wormed with some kind of a liquid ivermic she said. Is this a reasonable diet for him? How soon should I see some sign of weight gain? Is there anything else I should be doing?