August 2026

A Deadly Holding Pen: Poisoning Causes Sudden Loss of 14 Heifers

August 10, 2026August 5, 2026by ksubci

This case study examines a tragic incident in which 14 open heifers died within hours of being separated from a larger group following pregnancy testing. The heifers had been placed in a familiar holding pasture with a functioning water source and secure fencing, leading managers to initially believe the environment was safe. When all 14 animals were found dead later that day, investigators quickly ruled out infectious disease and focused on acute toxic causes due to the rapid onset and 100% mortality rate.

Potential causes considered included nitrate toxicity, cyanide poisoning, urea exposure, toxic plants, and other fast-acting toxins. Necropsies revealed few significant lesions, a common finding in animals that die rapidly from certain toxic exposures. Diagnostic testing of ocular fluid showed highly elevated nitrate levels, providing strong evidence of nitrate poisoning.

Further investigation of the holding area uncovered several nitrate-accumulating plants, including pigweed, kochia, and sorghum-type grasses, all containing nitrate concentrations high enough to cause acute death. Environmental conditions and plant stress likely contributed to dangerous nitrate accumulation, while the hungry heifers rapidly consumed the available vegetation after being placed in the pen.

The discussion highlights that facilities used safely for years can become hazardous when weather patterns, forage conditions, or management circumstances change. A key takeaway is to carefully evaluate holding pens for potentially toxic weeds, especially during late summer, and avoid turning hungry cattle into unfamiliar areas with questionable forage. Providing supplemental hay before and during confinement may be one of the simplest and most effective strategies for preventing similar losses.

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BRD Around the World and the Economics of Creep Feeding

August 7, 2026July 29, 2026by ksubci

This episode features a discussion with guest Dr. Selwyn Headley from Brazil, who shares insights into bovine respiratory disease (BRD) and how it compares to cases seen in North America. The group notes that many of the same bacterial and viral pathogens are involved in both regions, including Mannheimia, Histophilus, and several respiratory viruses, although some differences in prevalence and diagnostic findings exist. They emphasize that BRD is best viewed as a syndrome involving multiple pathogens and risk factors rather than a disease caused by a single organism. Common stressors such as transportation, commingling of cattle from multiple sources, and feedlot arrival continue to play major roles in disease development across both countries.

The conversation then shifts to creep feeding, defined as providing feed that nursing calves can access while their dams cannot. The hosts explain that creep feeding is often considered when forage quality or quantity declines late in the grazing season and producers want to maintain calf growth. While creep feeding can increase weight gain, its economic value depends on feed costs, calf prices, forage conditions, and how much feed is actually converted into additional gain.

The panel discusses how creep feed often substitutes for forage intake rather than reducing milk consumption, meaning it may not significantly improve cow body condition. They also note that feed type matters, with high-fiber feeds typically providing better supplementation and less forage substitution than starch-heavy grain sources. Additional considerations include the impacts on replacement heifers and breeding stock, where excessive energy intake at certain developmental stages may have long-term consequences. Overall, the episode highlights the importance of evaluating both biological responses and economic returns when deciding whether creep feeding is the right strategy for a particular operation.

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The Mystery Eye Disease Outbreak: Investigating a Point-Source Event in Stocker Cattle

August 3, 2026July 29, 2026by ksubci

This case study follows the investigation of a puzzling eye disease outbreak affecting approximately 10% of a group of 1,200 stocker cattle shortly after processing and placement on pasture. The affected animals developed severe eye lesions, including corneal cloudiness, swollen eyelids, redness, and inflammation, but lacked many of the classic ulcers typically associated with pinkeye. Because cases appeared almost simultaneously across numerous pastures separated by up to 90 miles, investigators quickly determined the outbreak did not fit the pattern of a contagious, spreading disease.

Instead, the timing and distribution suggested a point-source event linked to something the cattle experienced while gathered together during processing. Common causes such as pinkeye, infectious bovine rhinotracheitis (IBR), and mycoplasma infections were initially considered, but diagnostic testing failed to identify a clear infectious agent. Necropsies, histopathology, and laboratory testing revealed unusual eye lesions but provided no definitive diagnosis.

The investigation expanded to include less common possibilities such as malignant catarrhal fever and even immune-mediated eye disease, although evidence remained inconclusive. Interestingly, the outbreak peaked about two weeks after processing and then rapidly subsided without continuing spread, further supporting the point-source theory. The discussion highlights the importance of using epidemiology, history, and case patterns to guide investigations when laboratory answers are unavailable. Ultimately, while the exact cause remained unknown, the case demonstrates how understanding disease patterns can help narrow possibilities and inform future management decisions.

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