Figure 3

Mean amount of time per day below the three ruminal pH thresholds. Thresholds (pH < 5.0; 5.0 ≤ pH < 5.5 and 5.5 ≤ pH < 5.8) on d1 through d3, separated by the dietary treatment (CT = control, MS = medium starch, HS = high starch) and period (P1, P2, P3). Data are presented as averages and the associated P values are given by using the non parametric Kruskal-Wallis test. ^{A, B} Means of the amount of time per day below pH 5.0 with different superscripts are different (P < 0.05); ^{a, b} Means of the amount of time per day between pH 5.0 and 5.5 with different superscripts are different (P < 0.05); ^{α, β} Means of the amount of time between pH 5.5 and 5.8 with different superscripts are different (P < 0.05). The superscript letters refer to the interaction between the treatment and the period.