Table 6.
Results of the Spearman correlation and the regression analysis for the six new equations (y = l/pig d−1).
| Equation | 1 | 2 | 3 | 4 | 5 | 6 |
|---|---|---|---|---|---|---|
| Spearman correlation, n = 89,296 | ||||||
| rs | 0.90 | 0.89 | 0.87 | BW: 0.90 T: 0.87 |
BW: 0.90 THI: 0.89 |
0.80 |
| p-value | <0.0001 | <0.0001 | <0.0001 | BW: <0.0001 T: <0.0001 |
BW: <0.0001 THI: <0.0001 |
<0.0001 |
| Spearman correlation, n = 28 | ||||||
| rs | 0.90 | 0.89 | 0.87 | BW: 0.89 T: 0.87 |
BW: 0.89 THI: 0.89 |
0.81 |
| p-value | <0.0001 | <0.0001 | <0.0001 | BW: <0.0001 T: <0.0001 |
BW: <0.0001 THI: <0.0001 |
<0.0001 |
| Regression analysis, n = 28 | ||||||
| regression model | y = 0.142 * BW [kg] | y = 0.103 * THI | y = 0.295 * T [°C] | y = 0.109 * BW [kg] + 0.072 * T [°C] | y = 0.114 * BW [kg] + 0.021 * THI | y = 3.190 * FC [kg/pig d] |
| f-value (p) | 1209.19 (<0.0001) | 403.36 (<0.0001) | 544.69 (<0.0001) | 670.39 (<0.0001) | 666.31 (<0.0001) | 715.42 (<0.0001) |
| Root Mean Square Error (RMSE) [l/pig d−1] | 1.13 | 1.91 | 1.66 | 1.07 | 1.07 | 1.45 |
| adjusted r-square | 0.98 | 0.93 | 0.95 | 0.98 | 0.98 | 0.96 |
| coefficient variable t-value (p) |
34.77 (< 0.0001) | 20.08 (<0.0001) | 23.34 (<0.0001) | BW: 6.21 (<0.0001) T: 1.96 (0.0605) |
BW: 7.70 (<0.0001) THI: 1.92 (0.0663) |
26.75 (<0.0001) |
| Range of application of the new equations: BW: 27.2–75.7 kg/pig; FC: 1.5–3.6 kg/pig d; T: 22.2–28.3 °C; THI: 67.1–75.7 | ||||||
BW = body weight [kg/pig]; FC = feed consumption [kg/pig d−1]; T = temperature [°C]; THI = temperature-humidity index (calculated according to the equation of NWSCR [16]).