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| 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 |