When choosing a supplement or fortified feed I generally consider the following (for an "average" 1000 lb horse at maintenance):
The amount fed in one day provides a minimum of
Some supplements or fortified feeds can be safely fed at higher levels than the "usual" serving size but first check that this won't provide excessive vitamin A, vitamin D, selenium or iodine.
I rarely use anything "formulated for grass" as many grass hays already
have adequate calcium and using a product "formulated for grass" will
further unbalance the calcium to phosphorus ratio.
Regional Supplements Regional Supplements include the three Arizona mixes I developed and which are manufactured and sold by HorseTech, as well as Sally Huggs' California Trace.
Omega-3 Includes a calculator plus a pdf "snapshot" so you can see how different feedstuffs affect Omega-3 ratios. This originally began life to calculate how to increase phosphorus levels - thus the "Net Phos..." title.
Some new products have been added to the Omega-3 Sources chart. [I haven't include any fish-based products.]
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