Monensin effects on digestion of corn or barley high-concentrate diets.

摘要: We conducted two experiments to determine the effects of monensin addition on digestion high-concentrate diets based corn or barley and identify any interactions between grain source addition. A replicated in vitro experiment with a 2 x 4 factorial arrangement was used evaluate (0 72 mg/kg substrate) (corn, Gunhilde [GUN], Harrington [HAR], Medallion [MED]). Triplicate tubes for each treatment were incubated 0, 3, 6, 9, 12, 18, 24, 30 h. Rate extent IVDMD determined. Four ruminally abomasally cannulated steers Latin square design treatments test vs 270 mg steer(-1) d(-1)) (70% 80% barley). Diets balanced be isocaloric isonitrogenous. An interaction (P < .10) found during 3 through 9 h incubation. Monensin increased GUN MED, but it decreased HAR. Corn not affected by Steers fed had greater .05) microbial protein synthesis, rate situ DM starch disappearance, ruminal postruminal starch, total VFA concentrations, tract DM, OM, compared corn. feed N proportions acetate butyrate .001) proportion propionate. No observed variables measured vivo.