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Table 2 Severe repeat-breeder (SRB) risks in served female pigs by parity group

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

  Parity
Measurements 0 1 2 3 4 5 6 or later
Number of serviced records 93,604 78,243 70,596 62,258 53,371 43,634 52,352
Number of first return records 11,458 8734 5625 4730 3772 2694 2614
First return occurrences, % 12.2 11.2 8.0 7.6 7.1 6.2 5.0
Number of second return records 2325 1324 834 695 490 297 290
Number of culled records after the second returna 246 142 87 105 68 55 49
Number of removed records after the second returnb 394 232 168 136 90 68 64
Number of SRB femalesc 532 235 145 104 70 34 38
SRB risk for first-served females, % 0.57 0.30 0.21 0.17 0.13 0.08 0.07
  1. aNumber of females culled due to reproductive failure
  2. bOther removed records included females removed due to non-reproductive problems (e.g., lameness, diseases or death)
  3. cThe 8 pigs (1158-1150) had twice SRB in their lifetime