PM

PM_Ar

PM_Co

PM_Co_Ar

p

SEM

Sampling time 1

Rumen pH

PH

6958a

7022a

6798b

6693b

0.0001

0.339

Ammonia nitrogen (mg/l)

AAM

91,237a

47,147b

67,317b

63,797b

0.0005

4.298

Total VFA (mmol/l)

VFA

69,083a

51,083b

58,783ab

60,467ab

0.0081

2.015

Acetic acid (%VFA)

C2%

68,200a

68,100a

66,100b

58,500c

<0.0001

0.828

Propionic Acid (%VFA)

C3%

13,167d

17,900c

19,900b

20,467a

<0.0001

0.599

Butyric acid (%VFA )

C4%

8533c

10,500a

10,500a

10,367b

<0.0001

0.175

C2/C3 ratio

C2/C3

5180a

3804b

3322c

2859d

<0.0001

0.181

Methane (µmol/mmol VFA)

CH4

304,825a

299,225b

284,725c

248,433d

<0.0001

4.583

Sampling time 2

Rumen pH

PH

6757ab

6858a

6612b

6693ab

0.0271

0.031

Ammonia Nitrogen (mg/l)

AAM

86,830a

66,010c

74,730b

69,290ab

0.02127

3.720

Total VFA (mmol/l)

VFA

68,383a

55,717b

62,850ab

59,500ab

0.00658

1.782

Acetic acid (%VFA)

C2%

70,517a

67,433b

65,900c

56,700d

<0.0001

1.074

Propionic acid (%VFA)

C3%

14,750d

18,483c

19,900b

21,200a

<0.0001

0.504

Butyric acid (%VFA)

C4%

8,933d

10,900b

9100c

11,100a

<0.0001

0.208

C2/C3 ratio

C2/C3

4781a

3648b

3312c

2675d

<0.0001

0.159

Methane (µmol/mmol VFA)

CH4

312,496a

296,221b

278,225c

241,250d

<0.0001

5.525