Table 7.
The ordinary least squares regression (OLS) estimates of propionate, acetate, and acetate/propionate (A/P) impacts on methane (CH4) production in dairy and beef cattle.
| Model 1 | Model 2 | Model 3 | Model 4 | Model 5 | Model 6 | |
|---|---|---|---|---|---|---|
| Dairy Cattle | Beef Cattle | Dairy Cattle | Beef Cattle | Dairy Cattle | Beef Cattle | |
| Variable | CH4 Production (DMI) | CH4 Production (DMI) | CH4 Production (DMI) | CH4 Production (DMI) | CH4 Production | CH4 Production |
| Propionate % | −0.55 *** | −0.4 ** | ||||
| (p < 0.001) | (p < 0.02) | |||||
| Acetate % | 0.87 *** | 0.48 *** | ||||
| (p < 0.001) | (p < 0.01) | |||||
| A/P ratio | 0.28 *** | 0.09 ** | ||||
| (p < 0.001) | (p < 0.01) | |||||
| Intercept | 32.06 | 32.43 | 4.08 | 7.31 | 15.5 | 15.01 |
| R-Square | 21.41% | 21.35% | 27.63% | 10.35% | 45.07% | 14.52% |
| No. of Obs | 40 | 26 | 39 | 26 | 37 | 26 |
| Parameters | 2 | 2 | 2 | 2 | 2 | 2 |
| MSE | 8.8428 | 17.399 | 7.2949 | 19.833 | 4.8736 | 18.911 |
Note: A/P ratio = acetate/propionate ratio; DMI = dry matter intake; Methane = CH4; p-values in parentheses *** p < 0.001, ** p < 0.01. No. of Obs. = number of observations; MSE = mean squared errors.