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Table 1 Reproductive performance of sows in 155 herds

From: Recurrence patterns and lifetime performance of parity 1 sows in breeding herds with different weaning-to-first-mating intervals

Measurements n Mean SEM Median (IQR)
Lifetime records
 Age at first-mating 126,598 254.4 0.11 249 (235–273)
 Number of parity at removal 144,052 5.5 0.01 6 (4–7)
 Reproductive herd life days 144,052 834.1 0.86 882 (573–1098)
 Lifetime piglets born alive 144,052 68.0 0.09 71 (42–93)
 Lifetime non-productive days 144,052 74.1 0.14 57 (34–101)
 Annualized lifetime piglets born alive 144,052 28.7 0.02 29 (25–33)
 Annualized lifetime piglets weaned 144,052 25.4 0.01 26 (23–28)
Parity records
 Served parity 691,276 3.4 0.01 3 (2–5)
 Weaning-to-first-mating interval, days 691,276 5.9 0.01 5 (4–5)
 Farrowing rate, % 691,276 87.5 0.04
 Number of subsequent piglets born alive 647,814 12.5 0.01 13 (11–15)
Parity 1 records
 Lactation length, daysa 141,471 23.8 0.01 23 (21–26)
 Number of piglets weaneda 141,471 11.0 0.01 11 (10–12)
 Weaning-to-first-mating interval, days 144,052 7.3 0.01 5 (4–6)
  1. SEM standard error of the mean, IQR interquartile range
  2. aThe remaining records (144,052 - n) were regarded as missing records