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Selenium is an essential trace mineral for livestock. The selenium content in forage reflects the available content in the soil, which varies considerably due to the low soil content in several intensive agricultural areas (Oldfield, 2002). Therefore, selenium supplementation is recommended for livestock, and the requirement for beef cattle is 0.1 mg Se/kg/day (NRC, 2000). Selenium can be provided as inorganic mineral salts, such as sodium selenite (Na2SeO3) or selenate (Na2SeO4), or in organic forms such as Se enriched yeast (SeY), of which the main form is selenomethionine (SeMet) (Weiss, 2005). The ability of Se to improve the immune response in farm animals is well documented (Chauhan et al., 2014). Se deficiency has been reported to decrease humoral immune response and neutrophil killing activity in cattle without any clinical signs ABSTRACT. The effects of dietary supplementation with selenium enriched yeast on growth, immune and antioxidant status were assessed on 228 newly received beef cattle. During the adaptation phase (54 days), the animals were housed in 38 pens (19 pens per treatment) and supplemented with 0.32 mg · kg−1 DM of Se as sodium selenite (CTR) or selenium enriched yeast (SeY). At days 0, 19 and 54 the animals were weighed and blood samples were collected from one healthy animal per pen. During the experimental trial, bovine respiratory disease (BRD) occurrence was monitored. Blood antioxidant status, selenium serum concentration, bovine herpesvirus-1 (BHV-1) antibody titer and serum bactericidal activity were determined. Growth performance was improved (P < 0.05) and BRD occurrence was reduced (P = 0.06) in SeY group. SeY supplementation increased BHV-1 antibody titre after vaccination, highlighting a positive impact of SeY supplementation on immune system functioning. SeY supplementation improved (P < 0.01) selenium serum concentration and positively affected antioxidant status, expressed as Kit Radicaux Libres value, that tended to be higher (P = 0.07) in SeY group, due to Se higher bioavailability. The obtained results suggest that dietary supplementation with organic form of selenium improves growth performance, immune and antioxidant status in newly received beef cattle. Received: 16 December 2016 Revised: 13 February 2017 Accepted: 30 May 2017

Organic selenium supplementation improves growth parameters, immune and antioxidant status of newly received beef cattle