Lambs were divided into 3 groups of 6 animals each. For 35 days lambs were fed a diet including 2% rapeseed oil, 1% fish oil and 0.1% carnosic acid (the control group) or two experimental diets supplemented with 0.35 mg ∙ kg−1 Se as selenized-yeast (SeY) (the SeY diet) or selenate (the selenate diet). Muscles (