How to identify SELENIUM DEFICIENCY IN GOATS Posted on Oct 22, 2018Oct 22, 2018 by Sthabiso The first step to identifying a deficiency is to see if your soil is deficient in selenium. You can also contact your local extension agent and ask about selenium levels. Soil levels under .5 ppm are considered deficient Loading... Taking too long? Reload document | Open in new tab Download [5.60 MB] Posted in Goats.