Table 2. Description of gas emission, rumen fermentation characteristics, and production performances in ruminant database
| Parameter | Parameter estimates |
| n | Mean | SD | Median | MIN | MAX |
| Total data | | | | | | |
| CH4 (g/kg DMI) | 55 | 17.29 | 5.481 | 17.80 | 3.10 | 28.20 |
| H2 (g/d) | 26 | 1.95 | 3.091 | 0.89 | 0.00 | 12.43 |
| CO2 (g/d) | 25 | 10,674.44 | 3,005.371 | 10,500.00 | 6,240.00 | 14,905.00 |
| pH | 22 | 6.43 | 0.210 | 6.43 | 6.13 | 6.96 |
| Total VFA (mM) | 30 | 108.26 | 20.857 | 103.45 | 74.50 | 160.50 |
| Acetate (%) | 30 | 58.74 | 7.291 | 58.70 | 44.10 | 74.40 |
| Propionate (%) | 30 | 22.66 | 5.976 | 21.25 | 14.30 | 42.60 |
| Butyrate (%) | 30 | 12.85 | 2.927 | 13.40 | 5.00 | 17.80 |
| Iso-butyrate (%) | 30 | 1.12 | 0.337 | 1.08 | 0.57 | 2.10 |
| Valerate (%) | 30 | 1.94 | 0.472 | 1.85 | 1.20 | 3.19 |
| Iso-valerate (%) | 30 | 1.92 | 0.642 | 1.97 | 0.66 | 3.18 |
| A:P ratio | 30 | 2.88 | 0.919 | 2.77 | 1.06 | 4.90 |
| Ammonia (mg/dL) | 28 | 12.75 | 12.368 | 7.90 | 2.72 | 51.00 |
| Bacteria1) | 15 | 8.18 | 9.223 | 7.13 | 0.00 | 34.50 |
| Methanogen2) | 15 | 4.24 | 3.919 | 2.78 | 0.01 | 15.46 |
| Protozoa3) | 13 | 2.90 | 1.552 | 2.57 | 1.35 | 5.56 |
| DMI (kg/d) | 55 | 12.85 | 6.967 | 10.30 | 0.84 | 28.00 |
| DMD (%) | 14 | 68.10 | 4.863 | 68.70 | 58.40 | 75.30 |
| OMD (%) | 14 | 70.26 | 4.291 | 70.45 | 62.00 | 77.40 |
| NDFD (%) | 14 | 49.29 | 9.970 | 50.50 | 30.70 | 64.40 |
1010/g of rumen digesta.
108/g of rumen digesta.
105/g of rumen digesta.
SD, standard deviation; MIN, minimum value in database; MAX, maximum value in database; CH4, methane; DMI, dry matter intake; H2, hydrogen; CO2, carbon dioxide; VFA, volatile fatty acids; A:P ratio, acetate to propionate ratio; DMD, dry matter digestibility; OMD, organic matter digestibility; NDFD, neutral detergent fiber digestibility.