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Daily feedlot records from steer and heifer lots slaughtered between January 2015 and December 2020 were evaluated for timing of tylosin programs and death events. Tylosin applications were described as Any/None (1/0) in the first 30 days-on-feed, Any in the middle feeding period, and Any/None (1/0) in the last 30 days-on-feed. The final analysis included 125,520 lots of cattle with 18,814,224 head placed. By year, week of the year, week on feed, sex type, hundred-weight at placement anddoi:10.21423/bovine-vol55no2p134-139 fatcat:oi4yekeqzbawxjwxhi6mhurzlm