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Interesting, when I do feed grain, I usually feed Safechoice. I've never heard of GnW!
The GnW is a RB (ration balancer). Purina has one, Nutrena has one, Buckeye has one (GnW), Triple Crown has one, etc etc. Brand is going to depend on your location and what brands are available to you.
The 3 brands that I will use are Triple Crown, Buckeye and ADM. If I could get ADM here, they would be on it. The TC 30% seems to be higher in vit/min than the GnW which means I could actually feed less of the 30% than the GnW if I switch. I will only feed these brands b/c the companies have fixed formulas. Companies like Purina and Nutrena have low cost formulas which means that not every bag will be the same. They swap out ingredients for what is cheaper at that time. The fixed formula companies bags will be the same 100% of the time ingredient wise. They don't get cheap. Formulas are fixed and that's that.
The RB's aren't "grain." They don't contain any cereal grains (corn, oats, barley, ect), which is why they are low NSC. The GnW is 13% NSC, the 30% is 9.3% NSC, which is another reason I'd like to switch. They (RB's) are basically a low calorie vit/min supplement, but are easy to feed b/c they are a pellet and not a powder/granule. Which basically means its a vit/min supplement and carrier feed all in one. If you were to put them on a good vit/min supplement in powder form, you'd have to at least throw it in with a handful or two of some kind of feed b/c they probably wont eat it plain. I use the RB b/c my horses will leave the powder in the feed box no matter what feed I mix it with.
RB's are great for horses that are east keepers who maintain their weight on a mostly hay diet.
A salt/mineral block also can't provide adequate supplementation b/c their tongues aren't rough like a cows. The blocks were actually designed for cattle.