Narasin inclusion for feedlot lambs fed a diet containing high amounts of ground flint corn

Narasin is an antibacterial agent that may change rumen fermentation. Two experiments were proposed to evaluate the efficiency of narasin inclusion for lambs fed a diet containing high amounts ground flint corn. Thirty rumen-cannulated wethers used nutrient digestibility, nitrogen balance, and metabolism (Exp. 1); forty-five performance 2) animals with corn diets. The experimental diets were: control or basal without additives (C); 25 mg monensin kg?1 dry matter (DM) (M); 5 (N5), 10 (N10), 15 (N15) DM. statistical analyses performed using MIXED procedure SAS. Monensin increased DM digestibility compared C ( p = 0.01) increasing doses linearly < 0.01). There was quadratic effect 0.10) molar proportion acetate peaking at N15. 0.07) propionate C; however, it did not differ from narasin. levels decreased total volatile fatty acids concentration in 0.02). showed similar performance. ? 0.04) average daily gain feed efficiency. changed fermentation improved overall digestibility. However, received when M.