Addition of selenium and vitamin E in diet increases NK cell cytotoxicity in cattle - Greghi, Gisele Fernanda; Saran Netto, Arlindo; Latorre, Andréia Oliveira; Raspantini, Leonila Ester Reinert; Zanetti, Marcus Antônio; Correa, Lísia Bertonha (Annual Meeting of the European Federation of Animal Science, 2013)