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Abstract
An investigation was conducted to evaluate the bioavailability of different Se sources on fattening lambs. Forty-eight lambs, divided in 3 groups, were ad libitum fed the same diet without Se addition (control, C), or with a supply of 0.03% sodium selenite (IS) or 0.03% of organic selenium (OS; Sel-PlexTM). Growth performances were not affected by treatment. With respect to C, OS significantly increased Se content of blood (P<0.01), liver (P<0.01) and GSH-Px enzyme activity (P<0.01). OS also significantly increased blood (P<0.01) and liver (P<0.05) Se content with respect to IS. It was concluded that Se in organic form had a better bioavailability compared to the inorganic form.