Sulfur is a critical part of all proteins and horses need it to create protein, particularly the protein of their hooves and hair!
If it’s so important, why isn’t it included in FeedXL you might ask?!
We don’t include sulfur in FeedXL because the chance of a deficiency is virtually zero. Forages contain enough sulfur, so that even if intake was reduced to just 1% of bodyweight, maintenance reuirements would still be met.
My texts suggest possibly that straw based diets could become sulfur deficient, but as long as you use FeedXL to make sure protein requirement is met, the assumption is that sulfur requirement will also be met.
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