Table 1 Characteristics of the three pig herds included in the study
From: Effect of a GnRH analogue (peforelin) on the litter performance of gilts and sows
Herd A | Herd B | Herd C | |
|---|---|---|---|
Number of sows per herd | 1200 | 1700 | 600 |
Number of sows included in study | 56 | 87 | 119 |
Breed of sows | Danbred x York | PIC | Topigs20 |
Batch-production-system for sows (weeks) | 1 | 2 | 4 |
Lactation period (weeks) | 3 | 3 | 3 |
Piglets weaned/sow/year | 25.9 | 26.1 | 26.3 |
Age of gilts at first insemination (days) | 280 | 290 | 250 |