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Table 3 Comparisons of lifetime performance between three female return-to-service groups

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

  Female return groups
  Non-return Return once or twice, but not SRB SRB
Lifetime performance measurements N Mean (± SE) N Mean (± SE) N Mean (± SE)
Annualized lifetime number of pigs born alive 56,803 27.6 (0.15)a 29,093 25.7 (0.15)b 853 21.4 (0.26)c
Annualized lifetime number of pigs weaned 56,803 23.6 (0.10)a 29,093 22.3 (0.10)b 853 19.3 (0.20)c
Lifetime non-productive days 61,348 74.0 (1.26)c 31,106 122.5 (1.26)b 1150 165.3 (1.74)a
Lifetime pigs born alive 56,803 58.9 (0.80)b 29,093 60.9 (0.80)a 853 44.5 (1.35)c
Gilt age at first-mating, days old 57,022 254.6 (3.18)ab 28,771 253.7 (3.18)b 1044 254.7 (3.33)a
Number of parity at removal 61,348 4.7 (0.07)b 31,106 4.9 (0.07)a 1150 2.9 (0.10)c
Number of parity at culling 51,496 4.9 (0.08)b 27,389 5.0 (0.08)a 1052 2.8 (0.11)c
Number of parity at death 9852 3.2 (0.07)c 3717 4.1 (0.07)a 98 3.5 (0.24)b
Female life days 58,482 950.2 (10.28)b 29,407 1029.5 (10.28)a 1083 807.7 (14.99)c
Total cumulative re-service intervals, days 61,348 0.0 (0.00) 31,106 56.0 (1.05)b 1150 111.3 (1.52)a
  1. SE standard error, SRB severe repeat-breeder
  2. a-cMean values within a row followed by different letters differ (P < 0.05)