Table 5.
Enteric methane (CH4) emissions from feedlot animals fed high-forage diets supplemented with no additives (CON), monensin (MON, 33 mg/kg DM), 3-nitrooxypropanol (NOP, 200 mg/kg DM), and combination of MON and NOP
| −MON | MON | Effect, P value | ||||||
|---|---|---|---|---|---|---|---|---|
| Variable | −NOP | +NOP | −NOP | +NOP | SEM | MON | NOP | MON × NOP |
| No. of steers | 5 | 5 | 5 | 5 | — | — | — | — |
| DMI, kg/d | 6.79 | 6.23 | 5.19 | 6.11 | 0.340 | 0.09 | 0.71 | 0.14 |
| CH4, g/animal per day | 190.3a | 87.4c | 138.8b | 102.6 c | 10.40 | <0.01 | <0.01 | <0.01 |
| CH4, g/kg of DMI | 28.2 | 15.7 | 28.1 | 17.1 | 1.48 | 0.65 | <0.01 | 0.62 |
| H2, g/animal per day | 0 | 2.26 | 0 | 1.95 | 0.440 | 0.77 | <0.01 | 0.77 |
| CO2, g/animal per day | 7,399 | 6,434 | 6,676 | 6,775 | 605.2 | 0.76 | 0.48 | 0.39 |
a,b Values within a row with different letters differ (P ≤ 0.05).
Days, day × NOP, day × MON, day × NOP × MON were not significant for any of the above mentioned variable.