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Mean rumen pH variation at −8, −4, 0, 2, 4, 8, and 12 h relative to feeding from 1 to 6 wk after starter was available for 12 calves fed starter containing 5% straw differing in particle size either in the pellet (PS) or mixed with the pellet: short (SS), medium (MS), and long straw (LS) in trial 1. Linear effect for week, P < 0.01; cubic effect for time relative to feeding, P < 0.01 (SEM = 0.15). Color version available online.
