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Table 1 Reproductive data for female pigs in 98 commercial herds from 2008 to 2013

From: Characteristics and risk factors for severe repeat-breeder female pigs and their lifetime performance in commercial breeding herds

    Range
Measurements N Mean ± SEM Minimum Maximum
Lifetime records
 Parity at removal 93,604 4.6 ± 0.01 0 13
 Gilt age at first-mating, days olda 86,837 251.6 ± 0.15 160 400
 Number of lifetime pigs born alive 86,749 58.7 ± 0.11 0 202
 Lifetime non-productive days of female pigs 93,604 84.9 ± 0.16 0 289
 Female life days 88,972 942.8 ± 1.26 28 1703
 SRB females, % 93,604 1.2 ± 0.03
Parity records
 Parity at service 454,058 2.6 ± 0.01 0 12
 Records with two returns or more, % 454,058 1.37 ± 0.01
 SRB risk for first served females, % 454,058 0.26 ± 0.01
 Number of pigs born alive 360,454 12.1 ± 0.01 0 25
 Number of stillborn piglets 360,454 0.9 ± 0.01 0 19
 Lactation length, days 360,454 23.4 ± 0.01 10 41
 Weaning-to-first-mating interval, days 360,454 5.8 ± 0.01 0 35
Service records
 Number of services 501,855 1.1 ± 0.01 1 9
 Re-service intervals for RB females, days 4258 30.8 ± 0.31 11 145
  1. SRB severe repeat-breeder
  2. aThe remaining records (93,604-N) were regarded as missing records