Question 1

How is swine mortality rate calculated?

Accepted Answer

Mortality rate is calculated as (Number of Pigs Dead $\div$ Number of Pigs Started) $	imes$ 100. For example, 18 deaths from 500 pigs started yields a mortality rate of 3.6%. When a period length is provided, the annualized rate is calculated as mortality% $	imes$ (365 $\div$ period days), which normalizes rates across cohorts of different durations.

Question 2

What is an acceptable pre-weaning mortality rate in swine?

Accepted Answer

Industry benchmarks for pre-weaning piglet mortality are typically 10–12% for average herds, with top-performing operations achieving below 8%. Pre-weaning mortality is primarily driven by crushing/overlaying, starvation, chilling, congenital defects, and diarrhea. Rates above 15% warrant immediate investigation of farrowing management, sow nutrition, and piglet vitality.

Question 3

What are acceptable nursery and grow-finish mortality targets?

Accepted Answer

For the nursery phase (weaning to ~50 lbs), industry standard is below 3% total mortality, with top herds achieving 1–2%. For the grow-finish phase (50 lbs to market), acceptable mortality is below 4%, with high-health herds often below 2%. Mortality above these thresholds indicates disease pressure, environmental problems, or management gaps requiring investigation.

Question 4

Why should I annualize mortality rate?

Accepted Answer

Annualizing mortality allows fair comparison between cohorts observed for different time periods. A 2% mortality over 30 days represents very different disease pressure than 2% over 120 days. Annualized rate = mortality% $	imes$ (365 $\div$ days in period). This is particularly useful for nursery-to-finish comparisons and when presenting performance data across multiple production sites.

Question 5

What factors most commonly drive high swine mortality?

Accepted Answer

Pre-weaning: overlaying/crushing (35–50% of deaths), starvation, chilling, and diarrhea. Nursery: post-weaning diarrhea (E. coli), PRRS, Streptococcus, and systemic disease. Grow-finish: respiratory disease (influenza, PRDC, Mycoplasma), Ileitis, and tail-bite/fighting injuries. Systematic tracking of cause of death by phase is essential for targeted intervention.

Swine Mortality Rate Calculator

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