So I've tried so many commercial feeds for our program. Ugh

30-35 horses 

I was told KISS 

keep it simple stupid 

feed whole oats alfalfa pellets black oil sunflower seeds and either flax or rice bran. 

this is considerably cheaper as well compared to $44 a bag grain 

alfalfa cubes makeup out forage we have them on pasture and offer grass hay as well. 

does anyone do this. I read the Brandon Cullins article on this as well. 

Years ago when I worked for a local reining horse trainer his feed program was very simple and his horse looked fantastic.

rolled oats, a good quality mineral and alfalfa hay.

He had pasture but horses were only put on it once a week for a break in training.

I feed whole oats.  Which are grown locally.  Very inexpensive.  I add rice bran - Nutrena Boost, because I cannot get the ground like people in ARK and LA get.  (Much cheaper).  I feed alfalfa flakes as needed.  I have Gro Strong Minerals available 24/7.  Mine are also out 24/7 in pastures.  

Because of our heat, I do wet cubes almost year round because of our traveling and it helps with the water intake.  Once a day.  

I have done this now for 9 years.  

I put mine on ADM feed. Skin and bones and dull in three months. Two years later I did oats. Same result. Two years later I did Renew Gold. Same result. Recently I put two on a Purina product that didn't contain alfalfa. One gelding lost so much weight the cinch no longer fit. Mine are turned out on plenty of beautiful grass in sampled and fertilized soil. They get loose minerals and good supplements as needed. They just bloom on the locally milled cheap feed. Guess I'm lucky. 

Were the minerals left available to them 24/7 or fed? Also, how much, if you remember, oats and alfalfa were they receiving a day?

Well I live in Corn growing country. 

Mine get 2 lbs of whole shelled corn.

Split into 1 lb morning and 1lb night. 

Hand full of salt and minerals every other day only if there is none in the bottom of the feed bunk.

They are on round bales or pasture 24 / 7 year round.

Mine don't even have a building. 

Grain isn't the problem. 

It's the amount of grain is the problem.

We feed bluebonnet feed and a quality bermuda hay. The only supplements we feed are electrolites because of our summer heat and Redmon salt. Bluebonnet is a wonderful feed. Our horses are healthy and happy

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I think he was using the Moormans grostrong mineral and added about 2 oz size scoop each feeding.

His horses were in the 15h range size and were getting a full feed scoop of oats and flake of the alfalfa.

The big horse that was there of course wass getting a bit more (he was 16h).

I don't feed what you are asking about persay, but I am a firm believer is the best forage and plenty of it you can possibly get. 

I myself, prefer a low NSC so that eliminates corn and oats.  or at least puts them down the list in my feed. If you cut sugar and carbs out of your diet your joints thank you so I do the same for the horses. :)  Good luck with whatever you choose!