Two trials were conducted to determine the influence of preshipment
zeranol implant and
protein and
urea levels of the feedlot receiving diet on the performance of yearling steers. In each trial, one-half of the steers were implanted with 36 mg of
zeranol 30 d before shipment from El Reno, Oklahoma to Bushland, Texas. In trial 1, receiving diets were fed to 14 d and contained 10.6 (LP), 12.6 (MP), or 16.0% (HP) crude
protein (DM basis). A fourth diet contained 10.8%
protein with 7% of total N from
urea (LPU). In trial 2, receiving diets were also fed for 14 d and contained 12.4 (MP) or 16.7 (HP)
protein. Two other diets contained about 16%
protein with either 15% HPMU) or 30% (HPHU) of total N from
urea. After 14 d on the receiving diets, calves were fed a 70% concentrate intermediate diet for 7 d and were fed an 85% concentrate finishing diet until the end of both trials.
Zeranol implants did not significantly affect marketing-transit weight changes, but increased (P less than .05) daily
weight gains at all time periods in both trials. In trial 1 on d 14, steers fed the HP diet tended (P less than .10) to have faster gains and greater gain/feed than steers fed the LP and LPU diets, with steers fed the MP diet being intermediate.(ABSTRACT TRUNCATED AT 250 WORDS)