Measures of Reproductive Performance in Swine Relative to Industry Averagesa
Measures of Reproductive Performance in Swine Relative to Industry Averagesa
Industry Data | ||||
|---|---|---|---|---|
Measure | Explanation | Below Average | Average | Above Average |
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 |
aValues are based on breeding-herd record summaries from 2019 and include data from ~1,500 farms; the average herd size was >2,000 sows, representing fertility data for >2.5 million sows. Reference sources: MetaFarms, Production Index Analysis 2019; Swine Management Services, LLC; PigCHAMP, 2019 Benchmarking Summaries, USA. | ||||