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Re: [RC] Selenium deficient areas - Jennifer Judkins

In general, selenium deficiency is found in all states west of the Rockies and most states in the eastern third of the country (except mississipi and alabama which have high levels of Se).  Soil in the northern plains (dakotas, for example where ?Custers horses lost their hooves) tend to contain near toxic levels of Selenium. 

From what I understand horses do not need a whole lot of this heavy metal (right next to arsenic in the periodic table).  Alot of feeds have selenium in them.  So if your horse is performing well, even in a deficient area, I wouldn't supplement with out knowing what their blood levels are.  Selenium toxicity can look alot like deficiency so this is a good example of: 'too much of a good thing CAN be a bad thing'

BTW, a good book on natural nutrition mineral balancing and soil analysis: "Natural Horse Care"  by Pat Coleby.  I recommend it highly.


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Re: [RC] Site for locating agricultural extension agencies, C. Eyler