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Hourly rumen pH for calves diagnosed and treated at least once for BRD (RCASE) and those never treated (RCON). Rumen pH was determined from a data logging bolus (Well Cow Limited, Roslin, UK) with hourly means generated by BRD status averaged across the 56-d following feedlot arrival from data logged every 15 min. Effect of BRD, P = 0.36; hour, P < 0.01; and BRD × hour, P < 0.01. *RCASE differs from RCON within hour (P < 0.05).
