Table 5. Effect of cooling systems on reproductive performance in gestating sows exposed to heat stress during early pregnant stage1)
| Items | Treatments | SEM |
| HS | AC | WC |
| At the 35 d of gestation |
| Fertility (%) | 84.62 | 76.92 | 84.62 | 6.225 |
| Corpus luteum/sow (no.) | 20.00 | 20.00 | 18.67 | 1.314 |
| Embryo/sow (no.) | 14.67 | 16.00 | 9.67 | 1.519 |
| Embryo/corpus luteum | 0.74 | 0.81 | 0.53 | 0.071 |
| At the farrowing |
| Total litter size (no.) | 15.14 | 14.86 | 11.88 | 0.748 |
| Alive born (no.) | 14.14 | 14.00 | 11.25 | 0.701 |
| Mortality (%) | 6.41 | 5.04 | 5.42 | 1.550 |
| Birth weight (kg) | 1.52 | 1.39 | 1.57 | 0.044 |
Animals were subjected to heat stress for early stage (0 to 35 d) of gestation, whereas the other period was kept to below 24°C until parturition.
HS, without any cooling; AC, air cooling system; WC, water-drip cooling system.