Merck Manual

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Reproductive Benchmarking Indices Used in Commercial Swine Herds

Reproductive Benchmarking Indices Used in Commercial Swine Herds

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

<1.5%

>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%