popsdosh
Well-Known Member
Or test your forage if it all comes from the same source. As a major % of the diet that is the best place to look for deficiencies - that and the soil on which the grass your horses are grazing. I know mine is very low in Mg and selenium plus iodine, and I am lucky in that my forage comes off the same soil.
From experience on the farm forage analysis is pointless as it still does not tell you if the animal is getting it from the forage certain things will bind mins ans vits and make them unusable as far as the animal is concerned. Also you also find huge variations between bales even from the same land as different plants or grass species have different levels. The only way to make it anything like relevant is to pool samples from several bales.
From experience the only time we test for mins in plants is when we think we may have a problem in a growing crop . Just as only an animals blood profile can tell you if its getting enough .