Since it's the vet that has recommended the Omolene, that means the vet has already inspected teeth and the horse has probably been wormed by now?
I am beginning to think there is no gray area with Arabs --- they seem to either be very easy keepers or hard keepers.
Mine has always been a hard keeper and maybe I shouldn't be attributing it to the fact he was a body score of 3 when I rescued him 20+ years ago.
He also deals with gastric stomach ulcers, something else you might need to ask the vet about.
My Arab just turned 27 and his diet seems to need tweeked about once a year
For now he is getting:
1. Triple Crown Senior (an excellent feed even though your Arab is only 17).
2. Pelleted rice bran.
3. Alfalfa pellets but only 8 ounces as his system dumps the protein if I feed him more than that.
4. Omega-3 Horseshine
5. A PRE/probiotic that does not have fillers in it. I do not like FastTrak because it has "roughage products" in it
All that does is fill up the up the container with stuff that doesn't do anything to help the digestive system.
6. I have just put him on a very expensive product recommended by my vet. It is not prescription but mercy it is costly. Equiaide's "Body Builder".
The upshot is that it has given him some added energy, slicked his coat beyond "the Omega Horseshine Factor" and he loves it mixed in his feed.
If I was going to recommend adding one thing, it would be this stuff and take away the liquid oil you are currently feeding. I agree with you to not add the Omolene Equine Body Builder Rice Bran Oil Emulsion Equiade (Supplements - Weight Builders)
This is an all-natural product but my word of caution is that it contains corn oil and cane sugar. This is NOT something to feed horses with metabolic (insulin) issues that are hard keepers.
I am only half way thru the first bottle and have seen positive results, only feeding my Arab a dose every other day. He is out on pasture but when winter gets here and the pasture is depleted, I think this stuff will come in very handy to help keep weight on him.
Hope this helps