Hydroxy-analogue of selenomethionine

What it is. Hydroxy-analogue of selenomethionine is an organic selenium source obtained by chemical synthesis, intended for animal feed. It belongs to the functional group of trace element compounds and supplies selenium in a form close to the natural selenoamino acid.

What it is for. This additive is used as a selenium source in feed formulas for all species, as a complement to or substitute for inorganic sources (selenite, selenate). Organic selenium is generally mobilised to support antioxidant status and immune function, through incorporation into selenoproteins. A study in broiler chickens illustrates a possible synergistic effect between vitamin E and organic selenium on immune response, without constituting a dosage recommendation. Work in dairy cows also points to the interest of organic selenium in managing oxidative stress linked to production periods.

Points to watch. Maximum levels of total selenium in complete feed are set by regulation and must not be exceeded, across all sources combined. Analytical variability between batches and the need for precise dosing require regular quality control, given the narrow margin between useful intake and toxicity risk.