Fig. 1

Rumen pH and duration time of pH < 5.6 of goats fed LC or HC diets. Blue circle indicates the variation tendency of rumen pH in the LC group (n = 5, mean ± SEM); red rhomboids indicates the variation tendency of rumen pH in the HC group (n = 5, mean ± SEM); yellow bar indicates the averaged duration time of rumen pH < 5.6 in the HC group. LC, low concentration diet; HC high concentration diet