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Quantify lost milk yield (lb/cow/day), depressed feedlot Average Daily Gain (ADG), delayed days on feed, and net ranch revenue loss from heat and smoke.
Dairy stress begins at THI 68.
Smoke reduces appetite and foraging activity.
Models DMI depression (% intake drop) from THI threshold excess and smoke AQI, translating directly into lost milk checks or delayed feedlot marketing.
Test market volatility, drought stress, and feed cost fluctuations instantly.
150-cow commercial dairy at THI 79 and AQI 165 across a 14-day heatwave with $23.00/cwt milk price.
“A 14-day heat and smoke event reduces milk income by over $7,800 on 150 cows due to a 31% dry matter intake drop.”
| Field Name | Unit | Description | Typical Range |
|---|---|---|---|
| Enterprise Type | Dairy / Beef | Select Dairy (milk yield focus) or Beef Feedlot/Stocker (ADG and yardage focus). | Dairy, Beef Feedlot, Stockers |
| Average THI Stress Level | THI | Average daytime Temperature-Humidity Index during the event. | THI 65 – 92 |
| Smoke Air Quality (AQI) | AQI | Wildfire smoke density (higher AQI suppresses foraging and feed bunk visits). | 0 – 400 AQI |
Follow these standard operating steps to verify numbers and make actionable ranch decisions.
Verify scale weights rather than guessing. Round bale weights, cattle weights, or acreage measurements often differ by 15–25% from visual estimates.
Select the exact cattle category (lactating pairs, dry cows, herd bulls, stockers, or feedlot). The underlying biological engine adjusts DMI, AUE, and thermal thresholds accordingly.
Use the What-If sensitivity sliders to test weather shocks (blizzards, delayed green-up, heatwaves) or market price drops before locking in budgets or feeding plans.
Formulas and constants backed by USDA-ARS, NASEM Nutrient Requirements, and Land-Grant University Extension.
Cattle Ranch Calc adheres strictly to recognized biological standards established by the National Academies of Sciences, Engineering, and Medicine (NASEM) Nutrient Requirements of Beef Cattle (8th Revised Edition), the USDA Agricultural Research Service (ARS), and peer-reviewed extension research from Iowa State University, University of Nebraska–Lincoln, Texas A&M AgriLife, and Kansas State University.
Calculations are provided as predictive management benchmarks. Always corroborate output numbers with certified forage analyses, local scales, livestock nutritionist consults, or your local herd health veterinarian.
Calculate the minimum sale price per pound ($/lb) and per hundredweight ($/cwt) needed to cover all cattle purchase, feed, health, and carrying costs.
Calculate Temperature Humidity Index (THI) & Comprehensive Climate Index (CCI) tailored to cattle hide color, dairy/beef class, solar radiation, and night recovery hours.
Assess PM2.5 particulate inhalation volumes, alveolar macrophage suppression, and Bovine Respiratory Disease (BRD) susceptibility during wildfire smoke events.
Calculate surge water demand during summer heatwaves, peak 2-hour flow rates (GPM), linear trough space, and 48-hour emergency reserve gallons.