Peters, C.W.Laudert, S.B.Corah, L.R.Krehbiel, C.L.Nichols, David A.2010-09-172010-09-172010-09-17http://hdl.handle.net/2097/4986Feeding the ionophore monensin to yearling beef bulls improved (P<.05) weight gain by 4.2%. Final hip height was similar between treatments, but bulls fed monensin had almost 1 cm greater (P<.01) scrotal circumference and more than 10 cm 2 larger (P<.01) pelvic area. Semen characteristics generally were unaffected by treatment. However, bulls fed monensin had less (P<.01) semen motility than controls. Approximately 30 sperm morphology traits were evaluated; values were similar between treatments except for those traits listed. Collection date tended to influence (P<.15) volume, concentration, motility, and postfreeze characteristics.BeefBullsPerformanceMonensinSemenIonophoreMorphologyConference paper