Table 6.
Enteric methane (CH4) emissions from feedlot animals fed high-grain diets supplemented with no additives (CON), monensin (MON, 33 mg/kg DM), 3-nitrooxypropanol (NOP, 125 mg/kg DM), and combination of MON and NOP
| −MON | MON | P value | ||||||
|---|---|---|---|---|---|---|---|---|
| Variable | −NOP | +NOP | −NOP | +NOP | SEM | MON | NOP | MON × NOP |
| No. of steers | 5 | 5 | 5 | 5 | — | — | — | — |
| DMI, kg/d | 10.2 | 9.90 | 8.12 | 8.57 | 0.690 | 0.04 | 0.91 | 0.64 |
| CH4, g/animal per day | 160.1 | 73.9 | 155.7 | 112.4 | 20.50 | 0.45 | 0.01 | 0.35 |
| CH4, g/kg of DMI | 15.9 | 8.32 | 19.1 | 13.8 | 2.16 | 0.09 | 0.01 | 0.64 |
| H2, g/animal per day | 0.09 | 8.01 | 0.02 | 1.63 | 1.480 | 0.06 | <0.01 | 0.07 |
| CO2, g/animal per day | 11,311 | 11,388 | 11,042 | 10,534 | 1,877.2 | 0.72 | 0.90 | 0.75 |
Days, day × NOP, day × MON, day × NOP × MON were not significant for any of the above mentioned variable.