Differential Diagnosis of Cough in Feedlot Cattle: BRD vs. Other Respiratory Conditions

By Dr. Zubair Khalid, DVM, MS, PhD · 2026-08-11

Key Takeaways

• Bovine Respiratory Disease (BRD) typically presents 3-14 days post-arrival with fever, serous to mucopurulent nasal discharge, and a deep, moist cough, often associated with cranioventral lung consolidation detectable by thoracic ultrasound.
• Non-BRD cough etiologies, such as lungworm (Dictyocaulus viviparus), present with a dry, paroxysmal cough, often exercise-induced, with normal temperatures and no lung consolidation, diagnosed via fecal Baermann technique.
• Environmental factors like high dust and ammonia concentrations induce a dry, nonproductive cough, affecting multiple animals, resolving with improved ventilation, and characterized by normal temperatures and lung auscultation.
• Infectious Bovine Rhinotracheitis (IBR) is distinguished by severe upper respiratory inflammation, profuse serous nasal discharge, and a distressing cough, with potential for dyspnea and conjunctivitis, often with normal pulmonary auscultation early on.
• Thoracic ultrasonography is a critical point-of-care diagnostic tool, identifying lung consolidation and pleural effusion indicative of BRD, and is more sensitive than clinical scoring for early lesion detection.
• Response to antimicrobial therapy within 48-72 hours is a key indicator for BRD; failure to improve necessitates re-evaluation for non-BRD causes or complicated infections.

Cough in feedlot cattle is among the most common presenting complaints during the receiving period and throughout the feeding phase. The clinical challenge is not recognizing that a cough exists, but determining whether it represents bovine respiratory disease (BRD) requiring antimicrobial intervention, or one of several non-BRD conditions that demand a different diagnostic and management response. This article provides a structured framework for the practicing veterinarian working through cough in feedlot cattle, with emphasis on the clinical, diagnostic, and epidemiologic features that separate BRD from parasitic, environmental, and other infectious causes.

The reader is assumed to be a veterinarian with working knowledge of feedlot production systems and routine clinical examination techniques. The article focuses on diagnostic reasoning and differentiation, not treatment protocols. The content is organized to move from a rapid reference table through the pathophysiologic basis of cough generation, then into specific differential categories and a practical diagnostic workup. Where the evidence base is limited or contested, that uncertainty is stated directly.

At a Glance

Pathophysiology of Cough in Feedlot Cattle

Cough is a protective reflex triggered by mechanical or chemical stimulation of cough receptors distributed along the larynx, trachea, and larger bronchi. Receptors are sparse in the smaller airways and alveoli, which means that parenchymal disease alone may not produce cough until it extends to the conducting airways. This anatomic arrangement explains why early BRD can present with tachypnea or depression before cough becomes apparent, and why a cough may persist after parenchymal consolidation has resolved.

The cough reflex arc involves afferent vagal fibers projecting to the medullary cough center, followed by efferent motor output that coordinates glottic closure, diaphragmatic contraction, and expiratory muscle activation. In feedlot cattle, the efficiency of this reflex is influenced by body condition, concurrent metabolic stress, and the presence of nasal obstruction that forces mouth breathing. Cattle are obligate nasal breathers, so any condition that compromises nasal patency, such as infectious bovine rhinotracheitis (IBR) associated inflammation, alters the character and frequency of cough.

The distinction between upper and lower airway cough is clinically useful. Upper airway cough is typically harsh, nonproductive, and triggered by tracheal compression or pharyngeal irritation. Lower airway cough is deeper, often moist, and associated with bronchial exudate or consolidation. This distinction guides the initial differential list and the selection of diagnostic tests.

Bovine Respiratory Disease as a Cough Etiology

BRD remains the leading disease affecting the global cattle industry, and accurate diagnosis is essential for effective disease management Strategies for Bovine Respiratory Disease (BRD) Diagnosis and Prognosis. The condition is best understood as a complex of interacting viral and bacterial pathogens instead of a single etiologic entity. The classic model, described in the shipping fever literature, holds that viral infection or stress-induced immunosuppression damages the respiratory epithelium and mucociliary apparatus, allowing bacterial opportunists such as Mannheimia hemolytica and Pasteurella multocida to proliferate and cause fibrinous bronchopneumonia A review of infectious bovine rhinotracheitis, shipping fever pneumonia and viral-bacterial synergism.

Bovine herpesvirus 1, the cause of IBR, has been shown experimentally to act as a facilitating factor for bacterial pneumonia A review of infectious bovine rhinotracheitis, shipping fever pneumonia and viral-bacterial synergism. Bovine coronavirus (BCoV) also contributes to the respiratory disease complex in feedlot cattle, causing respiratory infections in cattle of various ages including shipping fever Bovine respiratory coronavirus. BCoV is a pneumoenteric virus that infects both the upper and lower respiratory tract, and it is shed in nasal secretions and feces Bovine coronavirus associated syndromes. The presence of enteric signs alongside respiratory signs in a coughing pen of cattle should raise suspicion for BCoV involvement.

The cough associated with BRD reflects the distribution of lesions. Early viral infection produces serous nasal discharge and a dry, frequent cough that may be mistaken for environmental irritation. As bacterial bronchopneumonia develops, the cough becomes deeper, less frequent, and more productive. Fever, depression, and reduced feed intake typically accompany the transition from viral to bacterial disease. However, subclinical BRD is well recognized, and animals may harbor significant pulmonary consolidation with minimal cough Strategies for Bovine Respiratory Disease (BRD) Diagnosis and Prognosis.

Clinical Scoring and Its Limitations

Standard clinical scoring systems for BRD rely on visual assessment of depression, nasal discharge, ocular discharge, cough, and rectal temperature. These systems are widely used in feedlot practice and research, but their sensitivity is limited. Infrared thermography studies have demonstrated that animals can be identified several days to over one week before clinical signs become manifest, with predictive values superior to conventional clinical scoring The use of infrared thermography as an early indicator of bovine respiratory disease complex. Automated infrared thermography systems integrated into water stations can detect elevated ocular or nasal thermal values in BRD-positive animals compared to negative controls The non-invasive and automated detection of bovine respiratory disease onset in receiver calves.

These findings carry practical implications for cough evaluation. A cough that appears in an animal with a normal clinical score and normal thermal imaging may represent a non-BRD cause, whereas a cough accompanied by elevated thermal values and declining feed intake is more likely to reflect early BRD. The practicing veterinarian should integrate multiple data streams instead of relying on cough alone as a BRD indicator.

Non-BRD Infectious Causes of Cough

Infectious Bovine Rhinotracheitis

IBR produces severe upper respiratory inflammation with characteriztic nasal mucosal lesions, profuse serous to mucopurulent nasal discharge, and a prominent, painful cough A review of infectious bovine rhinotracheitis, shipping fever pneumonia and viral-bacterial synergism. The cough in IBR is often more frequent and more distressing than in uncomplicated bacterial pneumonia. Affected animals may show dyspnea, open-mouth breathing, and conjunctivitis. The key distinguishing feature is the severity of upper respiratory signs relative to the degree of systemic illness. Fever is common, but pulmonary auscultation may be surprisingly normal early in the course.

Bovine Coronavirus Respiratory Infection

Respiratory BCoV infection produces a spectrum of disease ranging from subclinical shedding to overt pneumonia Bovine coronavirus associated syndromes. Cough in BCoV-affected feedlot cattle is often accompanied by mild fever, serous nasal discharge, and variable enteric signs. The absence of consistent antigenic or genetic markers to discriminate BCoVs from different clinical syndromes complicates diagnosis Bovine respiratory coronavirus. Practitioners should suspect BCoV when cough appears in a pen with concurrent diarrhea or when respiratory disease occurs despite adequate vaccination against the classic BRD viral pathogens.

Lungworm

Dictyocaulosis caused by Dictyocaulus viviparus is an important differential in grazing cattle but can also affect feedlot animals that have access to contaminated pasture or bedding. The cough in lungworm infection is typically dry, paroxysmal, and worse with exercise or handling. Fever is usually absent unless secondary bacterial pneumonia develops. Eosinophilia may be present on hematology, and fecal examination using the Baermann technique can confirm the diagnosis. The history of pasture exposure and the lack of response to antimicrobial therapy are the strongest clinical clues.

Environmental and Non-Infectious Causes

Dust and Ammonia

High concentrations of respirable dust and ammonia in confinement barns or drylot pens irritate the tracheobronchial tree and produce a dry, nonproductive cough that can affect a high proportion of the pen. The cough is typically worse during feeding activity or when cattle are moved, and it resolves when environmental conditions improve. Affected animals have normal temperatures, normal appetite, and no auscultatory abnormalities. The diagnosis is confirmed by environmental assessment and by observing that cough prevalence drops when dust or ammonia levels are controlled.

Congestive Heart Failure

Cough associated with congestive heart failure in feedlot cattle is less common but should be considered in older animals or those with a history of respiratory disease that has progressed to cor pulmonale. The cough is often soft, moist, and accompanied by exercise intolerance, jugular distension, and ventral edema. Auscultation reveals a cardiac murmur or arrhythmia in some cases, and thoracic ultrasound demonstrates pleural effusion or pulmonary edema. The distinction from BRD is critical because antimicrobial therapy is ineffective and the prognosis is poor.

Allergic or Irritant Bronchitis

Occasional feedlot pens develop acute-onset cough associated with moldy feed, noxious gases, or other inhaled irritants. The cough is sudden in onset, affects multiple animals simultaneously, and resolves when the offending agent is removed. Affected animals show no fever and no pulmonary consolidation. This diagnosis is made by temporal association and response to environmental correction instead of by any specific diagnostic test.

Diagnostic Sequence for the Coughing Feedlot Calf

The workup begins at the pen level, not the chute. Observe the group first. A single cougher among otherwise bright penmates carries different weight than 15 percent of the pen coughing with dropped feed intake. Count affected animals, note the character of the cough (dry, moist, honking, paroxysmal), and record whether coughing increases with forced movement or dust exposure. These observations shape the initial differential priority before any animal is restrained.

At the chute, obtain a rectal temperature, respiratory rate, and heart rate before handling stress confounds the readings. Perform thoracic auscultation in a quiet area, covering both lung fields and the trachea. Percuss the thorax when effusion or consolidation is suspected. Examine the eyes and nasal mucosa for the ulcerative lesions and serous discharge typical of infectious bovine rhinotracheitis, and assess the pharynx and larynx for swelling or pain on palpation. A complete physical examination must include the cardiovascular system, since cough with muffled heart sounds, jugular distension, or ventral edema shifts the differential toward congestive heart failure instead of primary respiratory disease.

The order of diagnostic testing follows the clinical suspicion. For the febrile, depressed animal with tachypnea and abnormal lung sounds, bovine respiratory disease (BRD) remains the leading consideration, and the diagnostic effort focuses on confirming lung consolidation and ruling out complicating pathogens. For the afebrile animal with a dry, exercise-induced cough and normal appetite, lungworm, dust, or allergic bronchitis moves up the list. For the animal with ocular lesions or a history of recent commingling, infectious bovine rhinotracheitis warrants specific testing.

Point-of-Care Diagnostic Tools

Thoracic ultrasonography is the most useful single point-of-care test for differentiating BRD from other cough causes. Using a 3.5 to 5 MHz curvilinear probe placed over the right and left lung fields between the 6th and 11th intercostal spaces, the practitioner identifies consolidation, atelectasis, or pleural effusion. A normal lung surface appears as a bright pleural line with reverberation artifact. Consolidated lung appears as hypoechoic tissue with a lobular pattern, often with comet-tail artifacts at the periphery. Ultrasonography detects lesions several days before clinical signs become obvious, and it provides objective evidence of pneumonia where clinical scoring alone remains unreliable. The technique requires only clippers, coupling gel, and a portable ultrasound unit, making it practical in most feedlot settings.

Infrared thermography offers a non-invasive screening option, though its role is primarily early detection instead of differential diagnosis. Automated systems mounted at water stations can identify animals with elevated ocular or body surface temperatures, often four to six days before clinical signs appear. One study reported that infrared thermography identified animals at early stages of illness several days to over one week before clinical signs were manifest, with positive and negative predictive values of 80 percent and 65 percent respectively, compared to 70 percent and 45 percent for clinical scoring. The technology flags suspect animals for individual examination, but it does not distinguish BRD from other febrile conditions, and its utility depends on equipment availability and environmental conditions.

Deep nasopharyngeal swabs or tracheal washes provide samples for bacterial culture and viral PCR. These tests are most valuable when the clinical picture is atypical, when treatment response has failed, or when a herd-level outbreak requires pathogen identification. A guarded swab reduces contamination with upper airway flora. Viral PCR panels typically include bovine herpesvirus 1, bovine coronavirus, bovine respiratory syncytial virus, and parainfluenza virus 3. Bovine coronavirus is shed in both nasal secretions and feces, and respiratory infection occurs in cattle of various ages including feedlot animals, so a positive nasal PCR must be interpreted alongside clinical signs and lung imaging. Bacterial culture of Pasteurella multocida, Mannheimia hemolytica, or Histophilus somni from a deep sample supports a BRD diagnosis, but culture results take days and do not guide immediate treatment decisions.

Differential Prioritization Framework

The following framework prioritizes diagnostic tests based on the presenting phenotype. It assumes a single animal or small group presentation in a feedlot setting.

Monitoring Parameters and Response Assessment

The response to initial therapy provides diagnostic information in itself. An animal with bacterial BRD typically shows improvement in rectal temperature, respiratory rate, and attitude within 48 to 72 hours of appropriate antimicrobial therapy. Failure to respond within this window should prompt re-evaluation of the diagnosis instead of simply repeating or escalating treatment. Persistent fever with worsening respiratory effort suggests a complicated infection, a resistant pathogen, or a non-bacterial cause.

Serial thoracic ultrasound offers an objective monitoring tool. Consolidation that expands or fails to resolve over five to seven days indicates treatment failure or a complicating process. Pleural effusion that increases on serial examination points toward fibrinous pleuritis or cardiac disease. Ultrasound also documents the extent of lung involvement for prognostic purposes, which informs culling decisions in chronic cases.

Body weight and average daily gain serve as longer-term monitoring parameters. Calves that recover from BRD but carry residual lung damage often underperform compared to penmates. Tracking treatment response, relapse rates, and chronicity within a pen identifies management factors such as dust, stocking density, or ventilation that perpetuate respiratory disease. The diagnostic framework for BRD continues to evolve, with growing interest in refining clinical diagnoses to curb antimicrobial overuse, and structured monitoring protocols support that goal.

Documentation and Record Keeping

Every coughing animal examined deserves a written record that includes the date, pen identification, animal identification, rectal temperature, respiratory rate, ultrasound findings, sample collection, and the working diagnosis. Record the cough character and whether it was induced by movement or dust exposure. Document the treatment administered, the response at 48 to 72 hours, and any change in diagnosis. This record supports both individual animal management and pen-level pattern recognition.

Pen-level records track cough prevalence over time, linking outbreaks to weather events, feed delivery changes, or pen cleaning schedules. When multiple pens are affected, compare management variables between affected and unaffected pens. The USDA Animal and Plant Health Inspection Service provides national programs and technical information for livestock disease control and surveillance that can guide record-keeping standards and reporting expectations. International standards from the World Organization for Animal Health also address surveillance and disease reporting frameworks that apply to production animal practice. These resources help the practitioner structure data collection so that patterns emerge reliably across seasons and cohorts.

Recognized Complications and Failure Modes

The most consequential failure in feedlot cough diagnosis is the misclassification of chronic, non-responsive BRD as treatment failure when the underlying problem is a different disease process. Chronically affected calves that have survived initial BRD episodes may cough intermittently for weeks due to bronchiolitis obliterans or pulmonary abscessation. These animals often have normal temperatures and good appetite, which leads pen riders to dismiss them as "poor doers" instead of animals with structural lung damage. Thoracic ultrasound identifies consolidated lung fields and abscessation in these cases, and the finding should redirect the plan from repeated metaphylaxis to culling decisions.

A second failure mode is the attribution of cough to BRD when the primary problem is laryngeal or pharyngeal dysfunction. Calves with diphtheria, laryngeal necrosis secondary to rough handling, or foreign body penetration of the pharynx present with cough, but they also show dysphagia, drooling, or abnormal vocalisation. These signs are easily missed in a chute-side examination focused on lung auscultation. A careful examination of the upper airway, including visual inspection of the pharynx when feasible, separates these cases from lower respiratory disease.

A third recognized failure is the over-interpretation of a single elevated temperature in a calf that has been exercised, handled, or held in a crowded pen. Rectal temperature rises with handling stress, and a single reading above 40.0 °C does not confirm BRD in the absence of other clinical signs. The same limitation applies to infrared thermography, which detects ocular surface temperature changes that precede clinical signs but requires validation against a composite reference standard including core temperature, clinical score, and hematologic parameters Schaefer and others, infrared thermography as an early indicator of BRD.

Common Errors in Clinical Reasoning

Less experienced clinicians frequently anchor on the most prevalent diagnosis. Because BRD accounts for the majority of respiratory disease in feedlot cattle, the cough is assumed to be BRD until proven otherwise, and alternative diagnoses are considered only after treatment failure strategies for BRD diagnosis and prognosis. The corrective action is to run a structured differential at the first examination, not after the second treatment course. The differential prioritization framework in the preceding section provides that structure.

A second error is the reliance on auscultation as the sole diagnostic modality. Lung sounds in cattle are referred over large fields, and a cranioventral murmur may be inaudible in a noisy chute environment. Ultrasound is more sensitive for detecting consolidation and should be used whenever the clinical picture is ambiguous. The same principle applies to the interpretation of nasal discharge, which is present in nearly all febrile respiratory disease and has poor discriminatory value.

A third error is the failure to consider the pen-level pattern. A single coughing calf is managed differently from a pen where 20% of calves cough within 48 hours of arrival. The latter pattern suggests a common exposure, such as a viral respiratory pathogen, a change in feedlot dust conditions, or a failure of the receiving protocol. The former pattern is more consistent with individual animal disease. Pen-level data should drive the investigation, not the reverse.

Limitations of the Current Evidence

The evidence base for BRD diagnosis is constrained by the absence of a true gold standard. Clinical scoring systems, biomarker panels, and imaging modalities are each validated against composite references that include clinical signs, temperature, and hematologic parameters, but these references themselves are imperfect the non-invasive and automated detection of BRD onset using infrared thermography. The consequence is that diagnostic accuracy figures reported in the literature are likely optimiztic, and the performance of any single test in a given feedlot will vary with disease prevalence, population immunity, and environmental conditions.

Expert opinion still differs on the role of bovine coronavirus as a primary respiratory pathogen. Some authorities consider BCoV a significant contributor to the bovine respiratory disease complex in feedlot cattle, while others regard it as a minor player that is frequently detected but rarely causative bovine respiratory coronavirus. The absence of a licensed respiratory BCoV vaccine in many regions complicates the interpretation of serologic surveys, and the correlates of protective immunity remain unknown bovine coronavirus associated syndromes.

The interaction between bovine herpesvirus 1 and bacterial pathogens is well established experimentally, but the field relevance of these findings to modern feedlot populations is less clear infectious bovine rhinotracheitis and shipping fever pneumonia. Vaccination programs have reduced the incidence of clinical IBR, yet the virus continues to circulate, and its contribution to undifferentiated cough in vaccinated calves is uncertain.

Referral, Consultation, and Reporting Thresholds

Most coughing feedlot calves are managed on-site without specialist referral. Referral to a veterinary diagnostic laboratory is warranted when the cough fails to respond to two appropriate treatment courses, when the pattern suggests a novel or emerging pathogen, or when a parasitic etiology is suspected but cannot be confirmed on fecal examination. Lungworm diagnosis requires larval recovery by Baermann technique, and a negative fecal flotation does not exclude the disease.

Regulatory reporting obligations vary by jurisdiction. Diseases such as bovine tuberculosis, contagious bovine pleuropneumonia, and malignant catarrhal fever are reportable in many countries, and the practitioner should consult the relevant national animal health authority when these conditions enter the differential WOAH terrestrial animal health standards. The USDA APHIS maintains current information on nationally notifiable livestock diseases in the United States USDA APHIS animal health information.

Specialist consultation with a veterinary nutritionist or agricultural engineer is appropriate when environmental factors such as ammonia, dust, or ventilation are suspected contributors. These consultations are often more productive than repeated diagnostic testing in herds where the cough is widespread, non-progressive, and unresponsive to antimicrobial therapy.

Frequently Asked Questions

How should I prioritize diagnostic testing when thoracic ultrasound or other advanced tools are unavailable?

When advanced imaging is unavailable, the diagnostic sequence relies on clinical scoring, response to therapy, and serial observation. Begin with a standardized clinical score that incorporates rectal temperature, respiratory character, nasal discharge, and attitude. Re-evaluate suspect animals at 24 to 48 hour intervals. A calf that deteriorates despite empirical therapy for bacterial BRD warrants reconsideration of viral, parasitic, or environmental causes. Infrared thermography, where accessible, can identify animals several days before clinical signs appear, but it requires specialised equipment and is not a substitute for physical examination. Infrared thermography as an early indicator of BRD showed predictive value in research settings, yet the technology remains an adjunct to, not a replacement for, systematic clinical assessment.

What are the practical limits of clinical scoring in a large commercial feedlot?

Clinical scoring systems trade sensitivity for speed. In a pen of 200 calves, a single observer cannot sustain the individual attention required to detect subtle cough or mild depression in every animal. The consequence is that early BRD cases are missed, and advanced cases are over-represented among treated animals. Strategies for BRD diagnosis and prognosis emphasize that accurate case identification remains a challenge for animal health technicians in feedlots. Automated monitoring systems, including those built around water stations, can collect biometric data continuously and non-invasively. Automated infrared thermography detection of BRD onset demonstrated that such systems can identify true positive animals using core temperature, clinical score, and hematologic parameters as a gold standard. These tools are most useful for triage, directing pen riders to animals that need individual examination.

How do I distinguish cough from lungworm infestation when fecal sampling is inconclusive?

Lungworm should remain on the differential list even when Baermann examination is negative, because larval shedding is intermittent and often low in carrier animals. Clinical features that favour lungworm include a persistent, non-productive cough that worsens with exercise, normal or only mildly elevated rectal temperature, and a history of grazing contaminated pasture before feedlot entry. Eosinophilia on a complete blood count supports the diagnosis but is not consistently present. A therapeutic trial with an appropriate anthelmintic can be diagnostic, provided the product is active against Dictyocaulus viviparus and the response is assessed objectively within 7 to 14 days. If cough resolves and does not recur, lungworm is confirmed as the cause. MSD Veterinary Manual clinical reference provides further detail on lungworm diagnosis and the limitations of fecal examination.

How should I document cough cases to support antimicrobial stewardship decisions?

Record the clinical score, rectal temperature, body weight, days on feed, and the specific cough characteriztics for every treated animal. Note whether cough is spontaneous or only induced by exercise or handling. Document the response to each treatment event, including the time to resolution or deterioration. This record supports two functions. First, it allows retrospective analysis of treatment efficacy and relapse rates by cohort. Second, it provides defensible justification for antimicrobial use if the case is reviewed by a regulatory body or quality assurance program. AVMA practice resources and WOAH terrestrial animal health standards both emphasize that responsible antimicrobial use depends on accurate diagnosis and documented clinical decision-making.

What should I tell a feedlot manager who wants every coughing calf treated immediately?

Explain that immediate treatment of every coughing calf will overtreat viral infections, parasitic disease, and environmental irritation, all of which do not respond to antimicrobials. This wastes money, increases labor demands, and contributes to antimicrobial resistance without improving outcomes. The manager should understand that a 24 hour observation period with serial clinical scoring is not neglect, it is diagnostic. Strategies for BRD diagnosis and prognosis note that refining clinical diagnosis is a pivotal step toward curbing antimicrobial overuse. Offer a concrete protocol: pen riders flag coughing calves, a trained technician scores them twice daily, and only animals meeting the treatment threshold receive antimicrobials. This approach protects animal welfare while preserving the effectiveness of the drugs that genuinely need to be used.

How does the diagnostic approach differ for calves in their first week on feed versus cattle 60 days or more into the feeding period?

Calves in the first week on feed are at peak risk for shipping fever pneumonia, and the interaction between viral infection and bacterial opportunists is central to the disease. Shipping fever pneumonia and viral-bacterial synergism established that Pasteurella hemolytica requires additional factors, such as bovine herpesvirus 1, to initiate disease. In this period, a coughing calf with fever and depression is presumed to have BRD until proven otherwise. Cattle 60 days or more into the feeding period have passed the high-risk window. Cough in this group is more likely to reflect chronic lung lesions from earlier undetected BRD, lungworm, or environmental factors such as dust and ammonia. Bovine coronavirus respiratory infection can cause respiratory disease in cattle of various ages, so it remains a consideration throughout the feeding period. The diagnostic threshold for antimicrobial treatment should be higher in the later period, and non-infectious causes deserve more weight.

Related Clinical & Scientific Guides

• Rumen Health Assessment in Dairy Cows: Clinical and Subclinical Indicators
• Mastitis Control Programs in Dairy Herds: Monitoring and Prevention
• Swine Nutrition and Health: Feed-Related Disease Diagnosis

References and Further Reading

• Strategies for Bovine Respiratory Disease (BRD) Diagnosis and Prognosis: A Comprehensive Overview.. 2024.
• A review of infectious bovine rhinotracheitis, shipping fever pneumonia and viral-bacterial synergism in respiratory disease of cattle.. 1982.
• Bovine respiratory coronavirus.. 2010.
• The non-invasive and automated detection of bovine respiratory disease onset in receiver calves using infrared thermography.. 2012.
• Bovine coronavirus associated syndromes.. 2010.
• The use of infrared thermography as an early indicator of bovine respiratory disease complex in calves.. 2007.
• USDA APHIS Animal Health Information. USDA APHIS.
• FAO Animal Production and Health. FAO.
• MSD Veterinary Manual, Professional Edition. MSD Veterinary Manual.

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This article is educational professional reference material for veterinary audiences. It is not a substitute for veterinary diagnosis, individual clinical judgment, current product labeling, or applicable regulatory requirements.