Weaned sows bred by 7 days (%)

Percentage of sows bred within 7 days of weaning

< 84%

86%–90%

91%–95%

Wean-to-service interval (days)

Days from wean to first service (may be extended in summer and fall and by parity 1 sows)

≥7–10 days

>6.0–6.9 days

4.5–6.0 days

Repeat services (%)

Percentage of sows reserviced within a wean group

≥9.0%–14%

5.1%–8.9%

2%–5%

Multiple matings (%)

Percentage of sows receiving multiple services (will be lower in single-service timed artificial insemination programs and can change with wean-to-service interval)

≤88%

90%–94%

95%–99%

Regular returns to service, 18–24 days (%)

Sows with a regular return to estrus (18–24 days)

≥9%–13%

5%–7%

1%–4%

Irregular returns to service, 25–37 days (%)

Sows with an irregular return to estrus (25–37 days)

>5%

2%–3%

< 2%

Abortions (%)

Percentage of pregnant sows that abort

>3%

1.5%–3.0%

< 1.5%

Not in pig (%)

Percentage of sows that reach full term, presumed pregnant, but do not farrow

≥2.1%

1%–2%

0.5%–0.99%

Day 30 conception rate (%)

Sows bred diagnosed pregnant by use of ultrasound

< 85%

88%–92%

>92%

Farrowing rate (%)

Percentage of sows mated that farrow

< 82%

83%–87%

88%–95%

Total pigs born/litter

Total number of pigs born per litter farrowed

< 13.5

13.9–14.9

15.0–16.0

Live pigs born/litter

Number of live-born pigs per litter farrowed

≤12.6

12.9–13.9

14.0–15.0

Stillbirths (%)

Percentage of total pigs born that are stillborn (changes with litter size)

≥8.0%

6.0%–7.8%

< 4.0%–5.99%

Number of stillborn pigs per litter

Number of stillborn pigs per sows farrowed

≥1.2–1.5

0.91–1.1

0.5–0.90

Mummified fetuses (%)

Percentage of total born pigs that are mummified (may increase as total born litter size increases)

≥3.0%–4.5%

1.0%–2.99%

≤0.7%–0.9%

Number of mummified fetuses per litter

Number of mummified fetuses per sow farrowed

≥0.5–0.6

0.3–0.4

0.1–0.2

Pigs weaned per sow farrowed

Based on calculation; measures may change if including nurse sows

≤9.8–10.8

11.0–11.5

≥11.6–12.2

Nonproductive sow days range

Measure will increase if data includes days from gilt entry until service

>56–74 days

42–50 days

≤30–38 days

Replacement rate (%)

39%–50%

52%–59%

62%–73%

Culling rate (%)

26%–37%

40%–47%

51%–65%

Sow mortality (%)

Includes sows that die or are euthanized

≥13.5%–16.8%

10.4%–12.4%

6.7%–9.4%

Weaning age range (days)

Excludes nurse sows

17.5–19.5 days

20.1–20.9 days

21.3–23.1 days

Gestation length (days)

May change based on use of induction of farrowing

< 114.5 or >116.5 days

115.9 days

116.0 days