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Swine Mortality Rate Calculator.

Calculate mortality rate by phase, optionally annualize, and benchmark against pre-weaning, nursery, and grow-finish industry standards.

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Validated2026-04-08
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Mortality Data

When to use

  • Tracking closeout mortality for nursery or grow-finish groups
  • Comparing mortality rates across cohorts, barns, or production sites
  • Benchmarking current performance against industry standards
  • Normalizing mortality data across cohorts of different durations
  • Reporting monthly or quarterly herd health performance to management

Do not use for

  • As a substitute for necropsy-based cause-of-death analysis (consult your herd veterinarian)
  • For individual animal tracking — this tool is designed for group-level analysis

Record pigs started at placement, not at birth

For nursery and grow-finish groups, "pigs started" is the number placed into the barn at the beginning of the phase — not the number born alive. Using born-alive count for nursery mortality calculations confounds pre-weaning and post-weaning mortality.

Track removals separately from deaths

Pigs sold or transferred out of the group are not deaths. Only count pigs that died in place or were euthanized. Lumping removals with deaths overstates mortality and distorts benchmarking.

Annualized rate inflates for short periods

Annualizing a 14-day observation window where a disease outbreak caused 5% mortality produces an annualized rate of 130% — mathematically correct but operationally meaningless. Annualization is most useful for full closeout periods (60+ days).

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Method

Mortality rate = (pigs dead ÷\div pigs started) ×\times 100. Annualized rate = mortality% ×\times (365 ÷\div period days). Phase benchmarks are based on published National Pork Board and Journal of Swine Health and Production references. All computation is client-side — no data leaves your browser.

2

Validated

Last validated 2026-04-08. Calculations are designed for planning and documentation support; verify procurement decisions against manufacturer specifications or institutional SOPs.

3

How to cite

How to Cite

ConductScience Swine Mortality Rate Calculator (v1.0). ConductScience, Inc. 2026. Available at: https://conductscience.com/tools/swine-mortality-rate-calculator

National Pork Board. Pork Quality Assurance Plus (PQA+) Reference Manual. National Pork Board, 2023.

Deen, J., et al. Mortality in the U.S. swine industry. Journal of Swine Health and Production, 2019.

Swine Mortality Benchmarks by Phase

Mortality benchmarks differ substantially by production phase. Pre-weaning mortality is the most variable and typically the highest in absolute terms.

Industry benchmarks: - Pre-weaning (birth to weaning): < 10% good, < 8% excellent, > 15% requires immediate action - Nursery (weaning to ~50 lbs): < 3% acceptable, < 2% top quartile - Grow-finish (50 lbs to market): < 4% acceptable, < 2% top quartile

Mortality tracking should be recorded by cause of death whenever possible. Even a simplified three-category system (trauma/crushing, enteric, respiratory) provides actionable signal for intervention prioritization.

Understanding Annualized Mortality Rate

The annualized mortality rate adjusts observed mortality to a common time base (365 days), making it comparable across cohorts of different lengths.

Formula: Annualized rate = mortality% ×\times (365 ÷\div period days)
Example: A 120-day grow-finish cohort with 4% mortality has an annualized rate of 4% ×\times (365/120) = 12.2%/year. This is useful for: - Comparing performance across production systems with different closeout lengths - Benchmarking against published annual mortality rates from industry surveys - Identifying seasonal patterns when tracking multiple cohorts over time

Note: Annualized rate is most meaningful when period length exceeds 30 days. Very short observation windows can produce misleadingly high annualized estimates.

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