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Fernando Díaz

Selenium is an essential trace mineral that is an indispensable component of the antioxidant system. Selenium is an essential element of antioxidant enzymes such as glutathione peroxidase, and its deficiency may result in an imbalance of redox homeostasis and ultimately oxidative stress.

Since selenium content in plants is highly variable, selenium is normally supplemented in dairy cow diets using inorganic sources (sodium selenite, sodium selenate), organic sources (selenium yeast, hydroxy-selenomethionine) or a combination of both. Ruminal metabolism and intestinal absorption of these selenium compounds differ as well as their antioxidant capacity.

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