Table 2 Effect of monensin (12 μg/ml) and cinnamon extract (1.5 mg/ml) addition on ruminal pH and cumulative gas production up to 24 h of incubation period using glucose as a substrate (Exp. 2)

 6 hours

5.88 ^c

6.48 ^a

6.14 ^b

0.042

 12 hours

4.53 ^b

5.04 ^a

4.43 ^b

0.022

 24 hours

4.14 ^b

4.51 ^a

4.17 ^b

0.024

 3 hours

57.12 ^a

40.31 ^b

50.33 ^a

1.65

 6 hours

124.39 ^a

81.38 ^c

104.81 ^b

7.05

 9 hours

146.69 ^a

111.79 ^b

140.89^a

6.27

 12 hours

160.17 ^a

133.94 ^b

154.03^a

5.31

 24 hours

173.03 ^a

154.70 ^b

164.79^a

4.42