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Reproductive Index
Target
Intervention Level
Wean-to-estrus interval (95% in estrus by 10 days postweaning)
<7 days
>9 days
Wean-to-service interval
≤5 days
>7 days
Repeat services at 21 (± 2) days
<8.5%
>11%
Abnormal returns to service (25–37 days)
<3%
>5%
Multiple matings (if not using fixed timed insemination)
>89%
<86%
Abortions
<1.5%
>2.5%
Not-in-pig
1%
2%
Farrowing rate
>86%
<82%
Total piglets born/litter
>12.5
<12
Live piglets born/litter
>11.5
<11
Stillbirths
<6%
>8%
Mummies
>3%
Litter scatter (≤8 pigs/litter)
<12%
>15%
Pigs weaned/litter
>10.4
<9.5
Preweaning mortality
<13%
>18%
Litters/mated female/year
>2.3
<2.2
Pigs weaned/mated female/year
>24
<22
Nonproductive sow days (without gilt pool)
<40
>50
Culling rate
30%–50%
<30% and >50%
