Table 3.
Descriptive statistics of the dataset used for evaluation of predictive equations of enteric methane emission (EME; g/cow/day) of lactating dairy cows.
| Item 1 | Mean | Median | Maximum | Minimum | SD 2 | n 3 |
|---|---|---|---|---|---|---|
| Animal | ||||||
| Body weight (BW), kg | 603.70 | 602.00 | 712.00 | 479.00 | 70.0 | 92 |
| Milk yield (MY), kg/day | 28.39 | 27.00 | 45.20 | 8.40 | 8.63 | 111 |
| 4% FCM, kg/day | 32.95 | 33.80 | 42.40 | 23.90 | 4.65 | 21 |
| Days in milk | 114 | 104 | 247 | 38 | 59 | 99 |
| Milk protein, g/kg | 32.17 | 32.25 | 36.80 | 27.30 | 2.38 | 92 |
| Milk fat, g/kg | 38.86 | 38.55 | 52.40 | 26.70 | 5.28 | 96 |
| Milk lactose, g/kg | 46.57 | 46.20 | 52.00 | 40.10 | 2.11 | 84 |
| Dry matter (DM) intake, kg/day | 19.70 | 18.50 | 28.50 | 12.65 | 4.43 | 105 |
| Diet | ||||||
| Forage in diet, g/kg DM | 576.95 | 571.00 | 800.00 | 361.50 | 90.38 | 77 |
| DM, g/kg | 465.23 | 448.00 | 666.00 | 145.00 | 104.41 | 35 |
| Organic matter (OM), g/kg DM | 927.14 | 930.00 | 955.00 | 900.00 | 13.03 | 77 |
| NDF, g/kg DM | 349.70 | 344.00 | 441.00 | 273.00 | 44.86 | 83 |
| Crude protein, g/kg DM | 168.54 | 166.00 | 236.00 | 145.00 | 14.87 | 83 |
| Ether extract, g/kg DM | 44.39 | 42.00 | 80.00 | 21.00 | 15.04 | 65 |
| Starch, g/kg DM | 195.68 | 208.00 | 300.00 | 5.00 | 76.39 | 47 |
| NFC, g/kg DM | 410.20 | 414.50 | 474.00 | 321.00 | 33.77 | 30 |
| DM digestibility, g/kg | 675.00 | 670.00 | 745.00 | 584.00 | 40.63 | 33 |
| OM digestibility, g/kg | 694.27 | 691.00 | 760.00 | 620.00 | 37.71 | 37 |
| NEL, MJ/kg DM | 6.79 | 6.51 | 8.10 | 6.28 | 0.57 | 24 |
| Enteric Methane Emission | ||||||
| Production, g/cow/day | 394.58 | 392.32 | 748.80 | 190.86 | 103.59 | 118 |
| Yield, g/kg DMI | 20.20 | 20.19 | 32.83 | 7.85 | 3.94 | 105 |
| Intensity, g/kg MY | 14.97 | 14.30 | 35.48 | 5.48 | 5.33 | 111 |
1 4% FCM = fat-corrected milk (kg/d); NDF = neutral detergent fiber (g/kg DM); NFC = non-fiber carbohydrates (g/kg DM); NEL = energy net of lactation (MJ/kg DM). 2 Standard deviation. 3 Dataset of treatment means was built after reviewing 35 experiments from 35 peer-reviewed papers (Supplementary Material Data S2; the complete dataset in Excel® file is available in an open research data repository, Donadia and Oliveira, 2023 [16]).