Extruded corn meal, % of DM

P value

Item

0

10

20

30

SEM

Linear

Quadratic

Rumen pH

5.69

5.72

5.65

5.65

0.16

0.78

0.92

Total VFA, mM

107

107

107

116

6.57

0.36

0.46

Rumen VFA, mol/100 mol

Acetate

52.5

54.8

54.9

49.2

3.54

0.55

0.28

Propionate

33.5

30.4

28.6

33.6

3.44

0.92

0.26

Isobutyrate

0.43

0.53

0.54

0.56

0.10

0.43

0.70

Butyrate

10.7

11.0

12.5

12.2

1.33

0.33

0.83

Isovalerate

1.77

2.28

1.86

2.81

0.46

0.22

0.64

Valerate

1.14

1.03

1.61

1.66

0.14

<0.01

0.57

Acetate: propionate

1.68

2.25

2.00

1.48

0.44

0.67

0.24

Methane²

0.43

0.47

0.49

0.42

0.05

0.90

0.26