Only the inorganic selenium salts sodium selenite  were available at a cost permitting their use in animal feed. Because selenium is an essential element, sodium selenite is an ingredient in some food supplements.

selenium can be toxic in high doses.

NOTE ::: Huge Differences between Sodium Selenite and Sodium Selenate ?

Sodium selenate is a common ingredient in some insecticides used against mites, aphids, and mealybugs. For most insects, a dose of 10 mg/kg is enough to be fatal. It is also used in some fungicides.

According to AAFCO, the maximum amount of selenium used in a dog food should not exceed 2.0 mg/kg on a dry matter basis — or about 18 times the recommended minimum of 0.11 mg/kg.

And on a caloric basis, the maximum suggested selenium content is 0.57 mg per 1000 calories of food — which is about 19 times the minimum 0.03 mg for the mineral.

Although AAFCO sets a maximum for most minerals, the National Research Council has yet to determine the safe upper limit for many inorganic nutrients — including selenium.

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