Table 4.
Linear and quadratic (where different from 0; P<0.05) regression coefficients (standard error in parentheses) of the association of sow live-weight and back-fat depth on total litter gain (kg), lactation intake (kg), lactation efficiency, wean to service interval (days) and number of piglets born alive in subsequent farrowing (BASF)
| Variables | Total litter gain | Lactation intake | Lactation efficiency | Wean to service interval | BASF |
|---|---|---|---|---|---|
| Sow weight 1 | |||||
| Service 2 | −0.535 (0.35) | −1.364 (0.65)* | 0.172 (0.47) | −0.024 (0.08) | −0.163 (0.10) |
| d25 | −0.551 (0.54) | −2.050 (0.94)* | 0.469 (0.76) | −0.033 (0.06) | −0.294 (0.13)* |
| d50 | −0.725 (0.40) | −3.750 (0.70)*** | −0.804 (0.52) | −0.109 (0.04)** | −0.224 (0.10)* |
| d80 | −0.577 (0.38) | −2.604 (0.65)*** | −0.106 (0.54) | −0.034 (0.04) | −0.227 (0.09)* |
| d110 | −0.071 (0.18) | −2.604 (0.65)*** | −0.350 (0.18) | −0.010 (0.04) | −0.153 (0.08) |
| Weaning | −0.374 (0.18)* | 0.719 (0.40) | 0.345 (0.19) | −0.085 (0.04) | −0.080 (0.09) |
| Sow weight adjusted for back-fat 1 | |||||
| Service | −1.329 (0.61)* | −1.401 (1.07) | −0.225 (0.83) | −0.130 (0.06)* | −0.271 (0.14) |
| d25 | −0.920 (0.66) | −0.784 (1.15) | 0.407 (0.94) | −0.014 (0.07) | −0.292 (0.16) |
| d50 | −1.188 (0.50)* | −3.249 (0.87)*** | −0.850 (0.66) | −0.131 (0.05)** | −0.201 (0.12) |
| d80 | −1.067 (0.49)* | −1.124 (0.82) | −0.210 (0.69) | −0.027 (0.05) | −0.220 (0.12) |
| d110 | −0.478 (0.24)* | −1.692 (0.52)** | −0.013 (0.26) | 0.012 (0.05) | −0.139 (0.10) |
| Weaning | −0.475 (0.30) | 2.276 (0.65)*** | −2.550 (2.24) | −0.069 (0.06) | 0.005 (0.11) |
| Sow back-fat 3 | |||||
| Service | 0.117 (0.23) | −0.770 (0.42) | 0.093 (0.32) | −0.007 (0.02) | −0.111 (0.06) |
| d25 | 0.038 (0.23) | −1.129 (0.40)** | 0.148 (0.33) | −0.017 (0.02) | −0.074 (0.06) |
| d50 | −0.009 (0.21) | −1.585 (0.37)*** | 0.009 (0.28) | −0.023 (0.02) | −0.098 (0.05) |
| d80 | 0.063 (0.20) | −1.652 (0.34)*** | 0.018 (0.29) | −0.015 (0.02) | −0.077 (0.05) |
| d110 | 0.235 (0.13) | −2.155 (0.27)*** | −0.325 (0.14)* | −0.018 (0.02) | −0.052 (0.05) |
| Weaning | −0.163 (0.17) | −1.251 (0.39)** | −0.014 (0.19) | −0.064 (0.03) | −0.078 (0.06) |
| −1.401 (1.07) |
Coefficients expressed per 10 kg increase in sow live-weight, that is, at service a 10 kg increase in sow live-weight was associated with a 0.535 kg decrease in total litter gain.
Service=sows inseminated; d25, d50, d80 and dd10=days 25, 50, 80 and 110 of gestation.
Coefficients expressed per 1 mm increase in sow back-fat depth, that is, at service a 1 mm increase in sow back-fat depth was associated with a 0.117 kg increase in total litter gain.
*P<0.05, **P<0.01, ***P<0.001.