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Are there negative effects of feeding supplemental anions (e.g., anionic salts) during the dry period? Which salts do you prefer?
Last Updated: August 20, 2007
If hypocalcemia or related disorders are a problem, we recommend feeding anionic products only for the last 21 days prior to calving. Feeding during the entire dry period could result in less benefit as the cow's metabolism adjusts to the acid load, could reduce bone levels of calcium, and would be expensive. Chloride-based anionic products are recommended with no ammonium salts (too much soluble protein risk). Calcium chloride (very unpalatable), magnesium chloride (not very available), and commercial anion-containing products like SoyChlor, Animate, and Biochlor are working well. Always bring magnesium levels up to 0.4% for the close-up dry cow ration using magnesium sulfate.
Mike Hutjens, Extension Dairy Specialist, University of Illiois - Illini DairyNET
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