However, the hay will not meet our requirements, and the grain source is most likely low. Horses should have access to iodized or trace-mineralized salt, which should be provided according to the manufacturer's recommendations. Signs of deficiency include decreased skin turgor, a tendency for horses to lick objects, decreased water intake, and chewing. The hay source does not totally meet the need of our horse. Grain sources usually compensate for these shortages.
Excess sulfur can cause problems for horses.
Sulfur-containing water is a significant source of sulfur. Excessively high levels of sulfur depress copper absorption. Sulfur is also found in protein, and high-protein rations contribute large quantities of sulfur. Iron absorption in nonruminants is usually less than 15 percent. This level would not meet our animal's needs.