Table 2.
Descriptive statistics for each trial included in the meta-analysis
| Experiment | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | |
|---|---|---|---|---|---|---|---|---|---|
| Cycle | 1 | 2 | |||||||
| Number of sows per treatment | 66 | 50 | 25 | 47 | 62 | 23 | 23 | 37 | 51 |
| Number of sows per parity group | |||||||||
| 1st | 40.5 | 9.0 | — | 15.7 | — | 5.0 | 1.0 | 2.0 | — |
| 2nd | 9.5 | 6.0 | 5.8 | 9.0 | 14.0 | 5.0 | 5.0 | 8.0 | 2.5 |
| 3rd | 7.0 | 6.8 | 6.7 | 13.0 | 13.0 | 5.0 | 8.0 | 18.0 | |
| 4th and higher | 16.0 | 28 | 12.4 | 15.6 | 35.0 | 12.0 | 19.0 | 30.5 | |
| Average parity | 1.9 | 3.1 | 2.5 | 2.4 | 3.3 | 2.3 | 3.2 | 3.2 | 3.5 |
| Average sows BW, kg | 214 | 278 | 296 | 268 | 281 | 289 | 289 | 252 | 248 |
| Backfat thickness initial, mm | 20.1 | 20.4 | 18.4 | 15.4 | 16.1 | 16.9 | 13.9 | ||
| Litter weight after cross-fostering, kg | 15.5 | 17.6 | 17.6 | 16.4 | 18.5 | 21.6 | 20.7 | 19.3 | 17.6 |
| Litter weaning weight, kg | 64.6 | 76.4 | 62.2 | 59.3 | 93.1 | 71.4 | 64.7 | 71.1 | 80.8 |
| Weaning age, day | 19 | 21 | 21 | 21 | 28 | 28 | 28 | 28 | 28 |