1-3月份配种母猪按胎次分成5组，比较不同过胎次间分娩率差异是否显著。
| Farm | Parity | farrowrate |
| 1 | 0 | 88.17% |
| 1 | 1~2 | 93.52% |
| 1 | 3~4 | 90.85% |
| 1 | 5~6 | 91.92% |
| 1 | 7~ | 91.57% |
| 2 | 0 | 81.02% |
| 2 | 1~2 | 95.35% |
| 2 | 3~4 | 91.95% |
| 2 | 5~6 | 94.12% |
| 2 | 7~ | 90.43% |
| 3 | 0 | 91.53% |
| 3 | 1~2 | 97.63% |
| 3 | 3~4 | 94.26% |
| 3 | 5~6 | 87.77% |
| 3 | 7~ | 89.93% |
| 4 | 0 | 82.73% |
| 4 | 1~2 | 93.41% |
| 4 | 3~4 | 92.59% |
| 4 | 5~6 | 85.19% |
| 4 | 7~ | 85.90% |
结论：1~2胎和3~4胎分娩率差异不显著，5~6胎、7胎以上、0胎间差异不显著，3~4胎、5~6胎和7胎以上差异不显著，其他显著。