Table 1. Descriptive statistics of 628 piglets born from 45 Landrace × Yorkshire sows on a farm in Vietnam.
| Parameters | n | Mean ± SD/percentage |
|---|---|---|
| P | 45 | 2.73 ± 1.8 |
| GL (day) | 45 | 114.9 ± 1.36 |
| LS | 45 | 14.6 ± 2.4 |
| FD (min) | 45 | 263.7 ± 176.8 |
| CRL (cm) | 617 | 28.3 ± 3.4 |
| BW (100 gm) | 617 | 14.5 ± 3.9 |
| BMI | 617 | 18.3 ± 5.3 |
| PI | 617 | 66.6 ± 42.8 |
| BI (min) | 582 | 20.7 ± 42.8 |
| Stillbirth ratea (%) | 617 | 14.3 (88/617) |
| Mummy rate (%) | 628 | 1.8 (11/628) |
| Incidence of stillbirth at litter level (%) | 45 | 68.9 (31/45) |
a Exclusion of 11 mummified fetuses.
SD: Standard deviation; P: Parity, GL: Gestation length, LS: Litter size, FD: Farrowing duration, CRL: Crown-rump length; BW: Birth weight; BMI: Body mass index; PI: Ponderal index; BI: Birth interval.