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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