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Table 3 Effects of soluble starch concentrations and pH on organic acids production

From: Relative significances of pH and substrate starch level to roles of Streptococcus bovis S1 in rumen acidosis

Items PH Concentration (g/L) MeanpH SEMTotal P pH P C P pH×C
1 3 9
Formate (mM)1 6.5 1.25 1.14 0.58 0.99 0.843 0.077 0.135 <0.001
5.5 0.48 0.92 1.21 0.87
MeanC 0.87 1.03 0.90  
Acetate (mM)1 6.5 4.15 3.83 2.05 3.34 0.210 0.701 <0.001 0.093
5.5 3.57 4.25 2.00 3.28
MeanC 3.86a 4.04a 2.03b  
Lactate (mM)1 6.5 14.66 34.28 56.01 34.98a 1.950 0.001 <0.001 0.641
5.5 9.83 26.62 47.63 28.03b
MeanC 12.25c 30.45b 51.82a  
OAtotal (mM)2 6.5 20.07 39.24 58.65 39.32a 2.114 0.001 <0.001 0.962
5.5 13.85 31.80 50.85 32.16b
MeanC 16.96c 35.52b 54.75a  
OAper (mM)3 6.5 20.07 13.08 8.38 13.84a 0.591 <0.001 <0.001 <0.001
5.5 13.85 10.60 10.17 11.54b
MeanC 16.96a 11.84b 9.27c  
Formate (%)4 6.5 6.26 2.87 1.00 3.38a 0.175 0.003 <0.001 <0.001
5.5 3.23 2.92 2.37 2.84b
MeanC 4.74a 2.90b 1.68c  
Acetate (%)4 6.5 20.63 9.82 3.50 11.32b 1.031 0.003 <0.001 0.102
5.5 25.83 13.42 3.93 14.39a
MeanC 23.23a 11.62b 3.72c  
Lactate (%)4 6.5 73.12 87.31 95.50 85.31a 0.929 0.006 <0.001 0.586
5.5 70.94 83.66 93.70 82.77b
MeanC 72.03c 85.48b 94.60a  
  1. 1Organic acids concentration at 40 h
  2. 2Total organic acids (formate, acetate, and lactate) concentration at 40 h
  3. 3Total organic acids production per gram soluble starch at 40 h
  4. 4Organic acid (mM) to the total products (mM) × 100
  5. a, b, cMeans different superscripts differ significantly (P < 0.05)