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Re: [RC] Prohibited substance? - Sisu West Ranch"...Since Mg++ is going to be in the body and sulfate is going to be in the body how the heck is it going to test?..." In the gut, the blood, bodily fluids, and cells there are many dissolved substances at any given time. Some of these substances are salts. Salts are composed of an anion (negatively charged, SO4-- it this case) and a cation (Mg++ in this case). Some salts immediately and essentially disassociate into cations and anions when placed in water (KCl, NaCl, MgSO4). Some do not, these are usually considered "insoluble" (the Calomel from yesterday's post, Bismuth Subsalicylate ("Pepto-Bismol"). Others are somewhere in-between. When a salt dissolves, it looses its identity. The horse's gut does not contain MgSO4, it contains Mg+2 ions, Sulfate-2 ions, Na+ ions, Cl- ions and a bunch more cat and anions. The only thing we can say for sure is that the number of plus charges exactly equals the number of minus charges. The normal physiological processes complicate the process further. Some ions (of both charges) are actively transported across the various membranes into and out of the body and cells. Some are actively not absorbed. The result is that the fate of the Mg+2 can be very different than the fate of the SO4-2. Bottom line: To understand the effect of ingestion of salts (electrolytes) the whole mix of ions in the gut, and body etc. plus mammalian physiology has to be considered. If you are trying to boost the Mg+2 in the horse, the exact salt used has a secondary effect, thus you see various sources of Mg used in various mixes. (Caveat: Remember what I said about complications? The physiology of the animal can change how much of the Mg from a specific salt can or is actually absorbed.)
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