Swine Physiology · U.S. State-Level Analysis

Swine Heat Stress by State

What is the predicted respiration rate of a pig under peak summer conditions in each state? Explore heat stress risk by adjusting radiant temperature and air speed.

Key metric

Respiration Rate

Predicted breaths per minute from a GBR thermal comfort model trained on swine physiological simulations.

Climate Scenarios

2050 Projections

Temperature and RH deltas from NCA5/LOCA2 (temp) and CHC-CMIP6 (humidity) under SSP2-4.5 (moderate) or SSP5-8.5 (high emissions).

Interpretation

Lower = safer

<30 bpm: normal · 30–60: mild stress · 60–100: moderate stress · >100: severe stress

Radiant Panel Temp 15 °C

Off

Air Speed 0.5 m/s

Evaporative Cooling

Off

Air temp → 65% to wet bulb · MRT uses panel setting

Climate Scenario

ASHRAE 1% current design conditions

Normal (<30 bpm)

Mild stress (30–60 bpm)

Moderate stress (60–100 bpm)

Severe stress (>100 bpm)

Sort by

State	Resp. Rate (bpm)	Zone	Outdoor DB (°C)	Eff. Air Temp (°C)	MRT (°C)	RH (%)	Air Speed (m/s)

Hourly Heat Stress Distribution Click a state on the map

Click any state on the map to load its TMY3 hourly summer data.

How to read this: States are colored by predicted pig respiration rate under ASHRAE 1% peak design conditions — the temperature exceeded only 1% of hours per year. Normal: <30 bpm. Mild heat stress: 30–60 bpm. Moderate heat stress: 60–100 bpm. Severe heat stress: >100 bpm. Use the sliders to explore the effect of radiant cooling panels and ventilation. Radiant panel temperature: MRT = 0.4 × panel temp + 0.6 × air temp. Lower panel temperatures and higher air speeds both reduce predicted respiration rate.

Limitations: Dry western states (AZ, NV, CO, NM, MT, ID, UT, WY) have very low coincident humidity at peak temperature; RH is floored at 30% in the model. Climate data uses ASHRAE 1997 design conditions.

Sources: Climate data — ACCA Manual J 8th Edition Table 1A (ASHRAE 1% annual cooling dry-bulb with coincident wet bulb), representative major airport per state. RH derived from dry bulb and wet bulb via psychrometric equation. Thermal model — Gradient Boosting Regression on swine physiological simulations (cross-val R²=0.97), evaluated via lookup-table quadrilinear interpolation. Map — US Atlas TopoJSON. Built with D3.js and TopoJSON.