TABLE 4.
Least square means of methane production recorded in Hanwoo and Holstein steers fed with TMR and SF diets over 24 h.
| Item |
Hanwoo |
Holstein |
SEM |
P-value |
||||
| TMR | SF | TMR | SF | Breed | FS | Breed × FS | ||
| CH4, g/d | 135.4 | 96.1 | 100.0 | 78.8 | 6.3 | 0.024 | <0.0001 | 0.061 |
| CH4, g/kg DMI | 23.9 | 19.5 | 15.7 | 10.9 | 1.2 | 0.001 | 0.021 | 0.853 |
| CH4, g/kg OMI | 25.6 | 21.5 | 16.9 | 12.1 | 1.3 | 0.001 | 0.029 | 0.776 |
| CH4, g/kg DOM | 47.9 | 32.7 | 30.6 | 20.7 | 2.6 | 0.001 | 0.004 | 0.325 |
| CH4, g/kg NDFI | 62.4 | 55.2 | 41.1 | 30.5 | 4.5 | 0.003 | 0.091 | 0.680 |
| CH4, g/kg DNDF | 177.1 | 114.3 | 109.7 | 74.5 | 16.2 | 0.006 | 0.010 | 0.412 |
| MCR | 7.4 | 5.5 | 4.9 | 3.1 | 0.4 | 0.001 | 0.009 | 0.894 |
| EF | 49.4 | 35.1 | 36.5 | 28.8 | 2.3 | 0.024 | <0.0001 | 0.074 |
DMI, dry matter intake; DNDF, digestible NDF; DOM, digestible organic matter; EF, emission factor (CH4 kg/head/yr); FS, feeding system; GEI, gross energy intake; MCR, metabolic conversion ratio (CH4 energy expressed as %GEI); NDFI, neutral detergent fibre intake; OMI, organic matter intake; SF, separate feeding; TMR, total mixed ration. Number of steers = 8.