arriving to the feedlots at 220 kg live weight or lighter are sent to abattoirs with over 500 kg approximately, six months later (Peel et al., 2011). The system requires a grain-based diet (mostly corn or other cereal sub products) in higher proportions (≥85%) in finishing diets (Peel et al., 2011).Bovine respiratory disease complex (BRDC) is considered the most important cause of morbidity and mortality in feedlots worldwide (Earley et al., 2017;Panciera and