Bovine Congestive Heart Failure (BCHF) is emerging as a significant health concern in feedlot operations across North America. Once considered a rare occurrence, this fatal condition is now responsible for an estimated 4–5% of feedlot mortalities, and its prevalence appears to be increasing as cattle are fed to heavier weights in response to intense market demands.

Understanding BCHF
BCHF is a non-infectious, irreversible condition that stems from pulmonary hypertension, ultimately leading to failure of the right side of the heart. Unlike high-altitude disease, which affects cattle raised at elevations above 5,000 feet, BCHF can occur at low to moderate elevations and in well-managed herds with high genetic merit. For some producers, it has become the most economically damaging health issue in their operations.

The disease manifests through a combination of specific and non-specific clinical signs. Key indicators include:

Primary Signs
• Swelling in the brisket or jaw area (ventral/intermandibular edema)
• Distended and pulsating jugular veins
• Abdominal swelling (ascites)
• Bulging eyes (exophthalmia)

Secondary Signs
• Labored breathing, often with an open mouth
• Elbows held away from the body
• Lethargy and drooping ears
• Intermittent orange-colored diarrhea
• Rapid heart rate
• Poor exercise tolerance
• Weight loss and muscle wasting (cachexia)

On necropsy, affected animals typically show an enlarged right heart, congested liver, and fluid accumulation in the chest and abdomen. However, a diagnosis of BCHF should exclude other conditions such as hardware disease, myocarditis (e.g., caused by Histophilus somni), and congenital heart defects.

What Causes BCHF?
Despite growing awareness, the exact mechanisms behind BCHF remain unclear. It is believed that impaired oxygen exchange in the lungs triggers increased pressure in the pulmonary artery, which overworks the right side of the heart. This leads to thickening of the heart muscle and eventual failure.

However, this explanation does not fully account for why the condition develops in some animals and not others.

Interestingly, BCHF is not limited to the final days of the feeding period—it can occur at any stage. This suggests that while nutrition and growth management may infl uence disease onset, they are not the sole contributors to the disease.

Genetic Insights
Recent research by the U.S. Meat Animal Research Center and the University of Nebraska–Lincoln has shed light on potential genetic risk factors. By comparing the genomes of a ected cattle with those of their healthy pen mates, scientists identified two gene markers that significantly increase the likelihood of developing BCHF when present together. These markers do not represent a direct genetic defect but may help identify animals at higher risk.

Moving Forward
Addressing BCHF will require a collaborative e ort among producers, researchers, and policymakers. Continued investigation into genetic, environmental, and management-related factors is essential to