# Beef Cattle Shade and Heat Mitigation ## Key Takeaways - Shade access is the primary structural intervention for mitigating heat load in beef cattle, reducing radiant heat gain and altering behavior; optimal efficacy requires permanent or portable structures oriented to maximize afternoon shade, providing at least 2.5 m² per animal. - Effective heat mitigation necessitates integration with proper handling timing (early morning/late evening), adequate water provision (≥ 5 cm linear trough space per animal, monitored flow rate), and airflow management (avoiding solid fences). - Heat stress significantly reduces feed intake, average daily gain, and carcass quality, while increasing morbidity and mortality; global modeling projects intensified production losses under future climate scenarios due to both acute events and chronic subclinical stress. - Physiological heat dissipation relies on respiration and sweating; impaired evaporative cooling due to high humidity, or reduced capacity from factors like endophyte-infected tall fescue or dark coat color, necessitates more aggressive mitigation strategies. - Behavioral monitoring, including posture, grouping, and respiration rate, is critical for identifying stress levels, with trained personnel escalating interventions when early signs are observed, and veterinary consultation recommended for mortality or multiple affected animals. - Planning decisions for shade, water placement, and handling schedules must be made *before* hot weather arrives, as retrofitting during a heat event is often ineffective; facility design should consider orientation to prevailing winds and material reflectivity. --- Shade access is the primary structural intervention for reducing heat load in beef cattle during hot weather, but it must be integrated with proper handling timing, water availability, airflow management, and behavioral observation. No single mitigation strategy eliminates heat stress risk, effective programs require coordinated planning across facility design, daily management, and personnel training. ## At a Glance | Intervention Category | Summary of Evidence | Key Management Notes | |---|---|---| | Shade access | Reduces radiant heat load and alters behavior patterns, type and orientation influence efficacy | Permanent or portable, orient to maximize afternoon shade, provide ≥ 2.5 m² per animal | | Handling timing | Early morning or late evening handling reduces core temperature elevation | Avoid handling when Temperature Humidity Index exceeds advisory thresholds | | Water provision | Critical for evaporative cooling, intake increases markedly during heat events | Locate near shade, ensure ≥ 5 cm linear trough space per animal, monitor flow rate | | Airflow management | Natural or mechanical airflow aids convective and evaporative heat loss | Avoid solid fences that block air movement, consider orientation to prevailing winds | | Behavioral monitoring | Changes in posture, grouping, and respiration rate indicate stress level | Stock personnel trained to recognize early signs and escalate | ## System Context: Heat Load and Production Risk Beef cattle accumulate heat from solar radiation, ambient temperature, humidity, and metabolic heat production. The heat load index developed for feedlot cattle integrates black-globe temperature, relative humidity, wind speed, and solar radiation to estimate thermal strain. This index provides a more physiologically relevant threshold than dry bulb temperature alone, though no single metric accounts for all individual animal variation. Heat stress reduces feed intake, average daily gain, and carcass quality, and increases morbidity and mortality risk. Global modelling studies project that heat stress will reduce cattle production across tropical and temperate regions under future climate scenarios. Production losses result from both acute heat events and chronic subclinical stress that erodes performance over days to weeks. ### Physiological Basis for Intervention Cattle dissipate heat primarily through respiration and sweating. As ambient temperature rises, the gradient for sensible heat loss narrows, forcing greater reliance on evaporative cooling. High humidity impairs evaporative efficiency, compounding the problem. Shade reduces radiant heat gain directly, while water and airflow facilitate evaporative loss. Failure to provide these resources forces animals to divert energy from production to thermoregulation. ### Endemic and Emerging Risks Cattle consuming endophyte-infected tall fescue exhibit impaired thermoregulation because ergot alkaloids constrict peripheral blood vessels, reducing heat dissipation capacity. These animals require more aggressive shade and water provision during hot weather. Similarly, dark-hided cattle absorb more solar radiation than light-hided cattle and may benefit from shade even at moderate ambient temperatures. ## Planning Decisions Before Hot Weather Arrives The effectiveness of heat mitigation depends on decisions made during facility design and seasonal preparation. Retrofitting shade or relocating water sources during a heat event is difficult and often ineffective. ### Shade Type and Orientation Permanent shade structures with solid roofs reduce solar radiation more effectively than shade cloth, but solid roofs can trap radiant heat underneath if not ventilated. Portable shade panels allow rotation of grazing or lot areas to prevent mud and manure accumulation. Orientation matters: north-south alignment provides more consistent coverage throughout the day, while east-west alignment maximizes afternoon shade in fixed locations. Shade area per animal should be calculated based on expected hot-weather stocking density. Inadequate shade area forces competition among animals, with subordinate individuals receiving less relief. Overhangs should account for sun angle at the hottest part of the day, typically late afternoon in most regions. ### Water Supply and Placement Water intake increases substantially when cattle are heat stressed. Troughs should be placed in shaded areas or, if that is not possible, oriented to minimize solar heating of the water. Flow rate must be adequate to meet peak demand, which can occur simultaneously across the herd. Trough depth and surface area affect water temperature, shallow, small-surface troughs heat up more rapidly. Cattle prefer water temperatures below 25°C and may reduce intake if water is excessively warm. Automatic waterers should be checked for electrical grounding problems that can deter drinking. Backup water supply plans should be in place for pump or well failure during extreme heat. ### Handling Schedule Design Movement during hot weather should be restricted to early morning or late evening, when ambient temperature and solar radiation are lowest. Handling during the middle of the day, particularly if it involves restraint, vaccination, or transport, can elevate core temperature to dangerous levels. Feedlot managers should delay processing until cool conditions and provide access to shade and water immediately after handling. Personnel must be trained to recognize signs of heat stress during handling: open-mouth breathing, excessive drooling, staggering, or collapse. If any of these signs appear, the procedure should stop and animals should be moved to shade and offered water. ## Core Management Framework for Heat Mitigation An effective framework requires daily monitoring of environmental conditions, assessment of animal behavior, and predefined action levels that trigger specific interventions. ### Environmental Monitoring On-site measurement of temperature, humidity, wind speed, and cloud cover provides the most accurate basis for decision-making. Off-site weather data can be used for planning but may not reflect conditions in the specific lot or pasture. Temperature Humidity Index remains a common reference, but the heat load index that includes solar radiation and wind speed better predicts strain in beef cattle. Monitoring frequency should increase when forecasts call for consecutive days of high temperature and humidity, as cumulative heat load is more dangerous than a single hot day. ### Behavioral Observation Protocols Cattle behavior changes predictably as heat load increases. Initially, animals seek shade, restrict activity, and group together in shaded areas. As stress worsens, they stand instead of lie down, increase respiration rate, and begin drooling. In severe cases, animals separate from the group, show difficulty standing, and may collapse. Stock personnel should conduct walk-throughs during the hottest part of the day, also during morning feeding. They must be able to distinguish normal panting from pathological heat stress panting. Animals that are not eating or drinking despite being at the trough warrant immediate attention. ### Escalation and Professional Involvement If mortality occurs or multiple animals require emergency cooling, a veterinarian should be consulted to confirm the diagnosis and adjust the mitigation plan. Post-event review should assess whether shade area, water flow, or handling timing contributed to the incident. Local extension or veterinary specialists can provide region-specific thresholds and intervention protocols. The USDA National Animal Health Monitoring System provides reference data on heat stress prevalence in U.S. feedlots. Consulting these resources can help producers benchmark their mitigation practices against industry standards. ## Facilities and Environment Shade provision is the primary environmental intervention for mitigating heat stress in beef cattle during hot weather. The design and placement of shade structures directly influence cattle behavior, thermoregulation, and productivity. Research on shade effects in feedlot heifers demonstrates that access to shade reduces panting, lowers respiration rates, and improves average daily gain compared with unshaded pens [Shade effects on performance, carcass traits, physiology, and behavior of heat-stressed feedlot heifers](https://api.elsevier.com/content/abstract/scopus_id/0036689603). Similarly, studies combining shade with water misting show additive benefits in reducing core body temperature and modifying feeding patterns during peak heat [Shade and water misting effects on behavior, physiology, performance, and carcass traits of heat-stressed feedlot cattle](https://api.elsevier.com/content/abstract/scopus_id/0035464517). Shade structures should be oriented to block direct solar radiation during the hottest part of the day, typically with a north,south alignment in temperate regions to provide moving shade as the sun arcs, though local latitude and prevailing winds must be considered. Roofing materials with high reflectivity (e.g., white or galvanized steel) reduce radiant heat load beneath the shade. Adequate height (3.5,4.5 meters) allows air movement and prevents trapped heat. Space allocation under shade should permit all animals to lie simultaneously without crowding, commonly 2,4 square meters per head depending on body size and pen density. The position of shade relative to feed and water bunks must encourage use. Cattle will preferentially seek shade when thermal stress is high, and if shade is placed too far from feed or water, intake may decline further. Handling timing is a critical management decision during hot weather. The Merck Veterinary Manual advises moving cattle early in the morning or late in the evening to avoid the diurnal temperature peak [Merck Veterinary Manual](https://www.merckvetmanual.com/). Handling during heat exacerbates stress responses,elevated cortisol, increased respiration, and higher core temperature,and may lead to exhaustion or injury. Chute-side procedures such as vaccination, weighing, or pregnancy checks should be scheduled when ambient temperature is below 25 °C if possible. The WOAH Terrestrial Animal Health Code emphasizes that handling facilities must be designed to minimize stress and should not be used during extreme weather without mitigation measures [WOAH Terrestrial Animal Health Code](https://www.woah.org/en/what-we-do/standards/codes-and-manuals/terrestrial-code-online-access/). Producers should have a written protocol that specifies temperature triggers for altering handling times. When delays are unavoidable, shade at handling facilities and misting systems can reduce acute heat load. Water access is the most immediate physiological need during heat stress. Cattle consume up to double their normal water intake when ambient temperature exceeds 30 °C. The Merck Veterinary Manual notes that water consumption is closely tied to feed intake, and reduced water availability during heat spells depresses dry matter intake within hours [Merck Veterinary Manual](https://www.merckvetmanual.com/). Waterers must be located within 15,30 meters of shade and feeding areas. Flow rates should supply at least 5,10 liters per minute per watering point to accommodate peak demand. Water temperature matters: warm water (>25 °C) reduces voluntary intake. Tanks should be shaded or buried to keep water cool, and automatic waterers require regular inspection for malfunctions during heat waves. The presence of endophyte-infected tall fescue interacts with water intake, cattle consuming toxic fescue alkaloids show reduced heat tolerance and altered drinking behavior, compounding dehydration risk [Effects of endophyte-infected tall fescue on animal performance](https://api.elsevier.com/content/abstract/scopus_id/0027805589). For operations on fescue pasture, shade and ample water are even more critical. Airflow is the second pillar of environmental heat mitigation. Stagnant air impedes convective and evaporative cooling. In feedlots, orientation of pens perpendicular to prevailing summer winds maximizes natural ventilation. Where natural airflow is limited, mechanical fans (e.g., over feed bunks or in holding pens) can increase airspeed and reduce effective temperature. The heat load index developed for feedlot cattle incorporates wind speed as a key factor, demonstrating that even modest increases in air movement (0.5,1.0 m/s) lower the effective heat load experienced by cattle [A new heat load index for feedlot cattle](https://api.elsevier.com/content/abstract/scopus_id/38149055066). Misters or foggers used in combination with fans further enhance evaporative cooling, though careful management is required to avoid muddy conditions that predispose cattle to foot problems and pathogen growth. Cattle behavior provides real-time indicators of heat stress. Normal lying and rumination patterns shift. Heifers provided with shade show more synchronized lying behavior and spend less time standing at waterers compared with unshaded cohorts [Shade effects on performance, carcass traits, physiology, and behavior of heat-stressed feedlot heifers](https://api.elsevier.com/content/abstract/scopus_id/0036689603). Bunching around waterers or shade structures, panting (open-mouth breathing with drooling), and reduced feeding activity are signs that heat load exceeds coping capacity. Cattle that fail to seek shade despite its availability may be experiencing advanced heat stress or concurrent disease. Producers should train staff to score panting (e.g., 0 = normal, 1 = elevated rate, 2 = open mouth, 3 = heavy panting with tongue extended) and record observations twice daily during heat alerts. ## Nutrition and Water Considerations Heat stress alters rumen fermentation and feed intake patterns. Cattle shift from daytime to nighttime feeding when shade is absent, but shade provision helps maintain more normal diurnal intake distribution [Shade and water misting effects on behavior, physiology, performance, and carcass traits of heat-stressed feedlot cattle](https://api.elsevier.com/content/abstract/scopus_id/0035464517). Ration formulation during hot weather should account for reduced dry matter intake. Increasing energy density (by adding fat or high-moisture corn) can partially compensate, but care is needed to avoid acidosis. Forage quality matters, lower-quality forages generate more metabolic heat during digestion. Water quality also influences intake. High sulfate or total dissolved solids reduce palatability. PubMed studies confirm that beef cattle undergoing heat stress experience increased water turnover and electrolyte losses, although specific electrolyte supplementation protocols are not included in the approved sources for this article [PubMed record 41495490](https://pubmed.ncbi.nlm.nih.gov/41495490/). The FAO Animal Production and Health resources provide general guidance on water quality standards for livestock [FAO Animal Production and Health](https://www.fao.org/animal-production/en/). Producers should test water sources annually and more frequently during droughts or heat waves. ## Production-Stage Decisions Heat mitigation strategies must be tailored to production stage. Weaned calves entering feedlots during summer face two stressors simultaneously: social regrouping and heat load. Gradual acclimation to shade and water locations over several days reduces morbidity. Breeding bulls require particular attention because heat stress reduces semen quality and libido. The USDA APHIS Livestock and Poultry Disease resources note that bulls with compromised thermoregulation due to lameness or previous illness are at higher risk of heat-related fertility loss [USDA APHIS Livestock and Poultry Disease](https://www.aphis.usda.gov/livestock-poultry-disease). For finishing cattle, the last 30,60 days on feed coincide with highest metabolic heat production. Failure to provide adequate shade during this period can depress average daily gain by 10,20% and increase dark-cutting carcasses. The impacts of heat stress on global cattle production are projected to intensify with climate change, with economic losses concentrated in mid-latitude regions [Impacts of heat stress on global cattle production during the 21st century: a modelling study](https://api.elsevier.com/content/abstract/scopus_id/85125834420). Producers in these zones should prioritize permanent shade infrastructure instead of relying solely on temporary tarps or tree cover, which may be insufficient during prolonged heat events. ## Records, Welfare, and Monitoring Consistent record-keeping allows identification of failure patterns. Document daily high temperature, humidity, wind speed, and cloud cover alongside each pen’s behavior scores and mortality. The USDA National Animal Health Monitoring System (NAHMS) collects beef cattle management data that can help operators benchmark their heat-stress mitigation practices against regional averages [USDA National Animal Health Monitoring System](https://www.aphis.usda.gov/livestock-poultry-disease/nahms). Welfare concerns arise when shade is absent or inadequate, waterers are fouled or malfunction, and handling occurs during the hottest hours. Such conditions constitute a failure to meet the WOAH principle of freedom from heat stress. Worker safety also deteriorates when cattle are agitated by heat, handling stressed animals increases the risk of injury from kicking, charging, or slipping. Carcass bruising and dark-cutting meat are economic consequences that reflect both welfare and food quality. [Food safety](/knowledge/bacteria/livestock-bacteria/cooking-chicken-bacteria-prevention) risks may increase if stressed cattle are transported or processed without adequate recovery time, as stressed animals are more likely to shed pathogens. ## Failure Patterns Common failure patterns include underestimating shade area required, placing shade too low, using dark roofing materials, and neglecting water flow rates. Another pattern is relying solely on shade without addressing airflow, shade that traps heat and humidity can become a microenvironment worse than open sun. Failure to maintain waterers during peak demand leads to aggressive behavior and dehydration. In pasture settings, reliance on single shade trees that do not move with the sun leaves cattle exposed during afternoon hours. The heat load index study explicitly warns against ignoring wind speed and humidity when assessing risk, as still air and high humidity greatly increase the effective heat load even at moderate temperatures [A new heat load index for feedlot cattle](https://api.elsevier.com/content/abstract/scopus_id/38149055066). ## Practical Monitoring Practical monitoring for beef cattle during hot weather should include twice-daily checks of shade occupancy (percentage of animals under cover versus in sun), water intake (checking float valves and tank levels), and respiration rates (count flank movements for 15 seconds and multiply by four). Cattle with respiration rates above 80 breaths per minute require immediate intervention: move to shade, provide cool water, and if possible, wet the hide with hoses or misters. Any animal showing open-mouth breathing with tongue extended and drooling is in severe heat stress and may need veterinary attention. The PubMed-recorded research on heat stress physiology in cattle indicates that prolonged exposure to conditions exceeding the thermoneutral zone leads to cumulative physiological burden, and recovery may take 24,48 hours even after ambient temperature drops [PubMed record 41990398](https://pubmed.ncbi.nlm.nih.gov/41990398/). Therefore, monitoring must continue after the heat event has passed. Worker assignments should include a designated heat-stress observer during extreme heat warnings, and the observer should have authority to halt handling or adjust protocols. By integrating shade access, water quality, airflow, and behavioral observation, producers can reduce heat-related morbidity and mortality while maintaining productivity and welfare standards. ## Health Observation and [Veterinary Management](/blog/careers/veterinary-management-running-a-successful-practice) Timely observation of cattle behavior and physiology underpins effective heat mitigation. Animals experiencing heat load exhibit elevated respiration rates, open-mouth panting, excessive drooling, and reduced feed intake. Grouping patterns shift as cattle cluster near shade or water sources, and mounting or aggressive interactions may decrease. Rumen temperature measured via indwelling boluses provides an early indicator of thermal strain, as documented in studies on shade effects on feedlot heifers [Shade effects on performance, carcass traits, physiology, and behavior of heat-stressed feedlot heifers](https://api.elsevier.com/content/abstract/scopus_id/0036689603). Without intervention, prolonged heat stress compromises immune function and predisposes animals to respiratory disease and acidosis. Biosecurity measures must be reinforced during hot periods: water troughs should be cleaned regularly to prevent algal growth and bacterial contamination, and shade structures must not obstruct drainage or accumulate manure. The WOAH Terrestrial Animal Health Code [WOAH Terrestrial Animal Health Code](https://www.woah.org/en/what-we-do/standards/codes-and-manuals/terrestrial-code-online-access/) provides standards for managing livestock environments to minimize disease transmission, while USDA APHIS guidance [USDA APHIS Livestock and Poultry Disease](https://www.aphis.usda.gov/livestock-poultry-disease) emphasizes the role of stress reduction in outbreak prevention. ### Diagnostic Triggers and Veterinary Escalation Practitioners must distinguish between transient heat discomfort and clinical heat stress. The heat load index for feedlot cattle [A new heat load index for feedlot cattle](https://api.elsevier.com/content/abstract/scopus_id/38149055066) integrates ambient temperature, humidity, wind speed, and solar radiation to classify risk. When the index exceeds established thresholds (specific to regional climatology and animal genotype), producers should consult a veterinarian for herd-level assessment. Animals with rectal temperatures above normal, persistent panting despite evening cooling, or signs of ataxia require immediate veterinary attention. The Merck Veterinary Manual [Merck Veterinary Manual](https://www.merckvetmanual.com/) details supportive treatments including relocation to shaded, well-ventilated pens, provision of cool drinking water, and, in severe cases, intravenous fluid therapy. Diagnostic workup may rule out concurrent conditions such as respiratory infections or endophyte toxicosis, which can mimic or exacerbate heat stress. Endophyte-infected tall fescue, for example, impairs thermoregulation and reduces performance [Effects of endophyte-infected tall fescue on animal performance](https://api.elsevier.com/content/abstract/scopus_id/0027805589), complicating diagnosis in grazing systems. ### Uncertainty in Mitigation Strategies Despite decades of research, uncertainty remains regarding optimal shade design across diverse environments. Studies on shade and water misting effects [Shade and water misting effects on behavior, physiology, performance, and carcass traits of heat-stressed feedlot cattle](https://api.elsevier.com/content/abstract/scopus_id/0035464517) show improved weight gain and reduced mortality, but the degree of benefit varies with breed, coat color, and acclimatization. Similarly, modelling studies project that heat stress will increase global cattle production losses through the 21st century [Impacts of heat stress on global cattle production during the 21st century: a modelling study](https://api.elsevier.com/content/abstract/scopus_id/85125834420), yet localized adaptation measures (e.g., genetic selection, cooling technologies) may alter outcomes. Producers should recognize that [controlled experiments](/blog/guides/controlled-experiments-what-they-are-and-why-they-matter) often differ from commercial feedlot conditions, and that cumulative effects of repeated heat events on long-term health are not fully characterized. Iterative monitoring with adjustment of shade area, feeding schedule, and water supply is prudent, especially when weather forecasts predict extended hot spells. ### Sustainability Considerations Integrating heat mitigation with sustainable production goals requires balancing resource use and animal welfare. Shade structures constructed from locally available materials reduce embodied energy, and placement that minimizes soil compaction and runoff supports pasture or lot longevity. The FAO Animal Production and Health division [FAO Animal Production and Health](https://www.fao.org/animal-production/en/) advocates for systems that reduce environmental footprint while safeguarding animal health. Biosecurity protocols that prevent heat-stressed animals from entering compromised pens also align with one-health principles,lowering antimicrobial use by preventing stress-associated disease. Long-term sustainability further depends on preserving genetic diversity: breeds with greater heat tolerance may be incorporated into crossbreeding programs, but careful management of shade and nutrition remains foundational. --- ## Frequently Asked Questions **1. How much shade area is needed per beef cow during hot weather?** Recommendations vary by location and cattle type, consult local extension bulletins for region-specific guidance. **2. Can shade cloth replacement reduce heat load if natural shade is unavailable?** Yes, shade cloth with 80,90% solar blockage can lower radiant heat load, provided it is installed with adequate height for airflow. **3. Do fans or misters help when shade is already present?** Additional cooling devices may be beneficial in confined areas, but they require clean water and electrical safety, observe cattle preference. **4. How does heat stress affect reproductive performance?** Elevated body temperature can reduce conception rates and embryo survival, shade provision during breeding seasons is recommended. **5. What biosecurity risks increase during heat waves?** Crowding near shade and water sources facilitates pathogen spread, maintain clean waterers and separate sick animals promptly. **6. Should I adjust feed formulation in hot weather?** Consult a nutritionist, increasing energy density and feeding during cooler hours may help maintain intake. **7. How can I tell if a cow is dangerously overheated?** Persistent open-mouth panting, drooling, unsteady gait, or recumbency warrants immediate veterinary assessment. **8. Are there breed differences in heat tolerance?** Yes, Bos indicus breeds generally tolerate heat better than Bos taurus, however, all cattle benefit from shade and water access during extreme conditions. --- **Educational Veterinary Notice:** This article provides general principles for heat stress mitigation in beef cattle. Individual farm conditions vary, consult a licensed veterinarian for herd-specific health plans and before implementing new management strategies. Always follow local animal welfare regulations and biosecurity guidelines from WOAH and USDA APHIS. ## Related Farming Guides - [Beef Cattle Farming Forage Reproduction Calving Health Signals And Herd Management](/knowledge/animal-farming/beef-cattle/beef-cattle-farming-forage-reproduction-calving-health-signals-and-herd-management) - [Beef Cattle Body Condition Scoring](/knowledge/animal-farming/beef-cattle/beef-cattle-body-condition-scoring) - [Calving Management For Beef Herds](/knowledge/animal-farming/beef-cattle/calving-management-for-beef-herds) - [Rotational Grazing For Beef Cattle](/knowledge/animal-farming/beef-cattle/rotational-grazing-for-beef-cattle) - [Beef Herd Biosecurity Plan](/knowledge/animal-farming/beef-cattle/beef-herd-biosecurity-plan) ## Related Clinical & Scientific Guides * [Cattle Head Gate Selection and Adjustment](/knowledge/animal-farming/beef-cattle/cattle-head-gate-selection-and-adjustment) * [Beef Cattle Handling Facility Flow](/knowledge/animal-farming/beef-cattle/beef-cattle-handling-facility-flow) * [Beef Cattle Maternity Pen Design: Comfort and Monitoring](/knowledge/animal-farming/beef-cattle/beef-cattle-maternity-pen-design-comfort-monitoring) ## References and Further Reading - [FAO Animal Production and Health](https://www.fao.org/animal-production/en/) - [WOAH Terrestrial Animal Health Code](https://www.woah.org/en/what-we-do/standards/codes-and-manuals/terrestrial-code-online-access/) - [USDA APHIS Livestock and Poultry Disease](https://www.aphis.usda.gov/livestock-poultry-disease) - [Merck Veterinary Manual](https://www.merckvetmanual.com/) - [USDA National Animal Health Monitoring System](https://www.aphis.usda.gov/livestock-poultry-disease/nahms) > This article is educational and is not a substitute for veterinary diagnosis, treatment, public-health guidance, or regulatory reporting.