Abstract
ABSTRACT Improvements in feed conversion of almost 6% were noted when monensin and lasalocid were rotated at various intervals in reports from the late 1980s and early 1990s. If true, such a response would hold large economic implications for cattle feeders in western Canada. Thus, yearling steers (n = 10,012; 36 pens; initial BW: 438.8 ± 8.1 kg) fed at 2 commercial feedlots in Alberta, Canada, were used to evaluate the effect of daily rotation of lasalocid (36 mg/kg) and monensin (25 mg/kg; ROT) compared with daily feeding of monensin only (25 mg/kg; CTRL) on performance, carcass, and health variables. Steers were fed finishing diets based on dry-rolled or temper-rolled barley grain until slaughter (112.6 ± 23.1 d). There were 18 replicates per experimental group, and the single-pen lot was the experimental unit (36 single-pens lots; 278 ± 54 steers per single-pen lot). Carcass-adjusted ADG were greater (P
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