Category: Bovine Science with BCI

This case study examines a sudden and devastating loss in which five cows and two calves died shortly after being moved to a dry lot following the calving season. The affected group consisted of only six cow-calf pairs that had been separated because they were open or had calved late, making the rapid mortality highly suspicious for a toxic exposure rather than an infectious disease. Necropsies revealed few significant findings, while the only surviving cow showed severe neurological signs, including tremors, vocalization, and an inability to stand.

Investigators focused on feed and water as the most likely sources of exposure and collected samples from the animals, feed, and environment for evaluation. During the investigation, foreign granules were discovered in the feed bunk and were ultimately traced back to agricultural pesticide residue left inside a skid steer bucket. The bucket had previously been used to handle granular pesticide from corn planting operations and was later used to deliver feed without being adequately cleaned.

The pesticide contamination explained the rapid onset of deaths and neurological symptoms observed in the remaining cow. The discussion highlights how potent agricultural chemicals can become deadly when accidentally introduced into livestock feed, even in relatively small amounts. A key takeaway is the importance of maintaining dedicated equipment for feed handling whenever possible or thoroughly cleaning equipment used for agricultural chemicals before reusing it. The case also demonstrates the value of careful history-taking and field investigation, which often provide the answers before laboratory testing is even completed.

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This episode examines research exploring why some cow-calf producers adopt written grazing management plans while others do not. The study was motivated in part by sustainability goals aimed at improving grazing land management, soil health, water infiltration, and drought resilience through more structured planning. Researchers analyzed survey data from producers across the United States to identify factors associated with both written grazing plans and intensive grazing practices.

Results showed that larger land holdings were associated with a greater likelihood of having a grazing management plan, while larger herd sizes were somewhat less likely to adopt one. Producers using rotational or management-intensive grazing systems were also more likely to have written plans, suggesting that planning and intensive grazing management often go hand in hand. The study found relatively few strong demographic influences, indicating that adoption is driven more by management style and operational goals than by age or experience alone.

One of the most important findings was that producers with either a mental or written grazing plan were more likely to achieve positive returns over off-farm feed costs than those with no grazing plan at all. Operations that regularly evaluated and updated their plans also showed stronger economic performance. The discussion emphasizes that written grazing plans do not need to be rigid prescriptions, but rather flexible tools that help producers track forage resources, adjust management over time, and make more informed decisions. Overall, the research suggests that thoughtful grazing planning can benefit both ranch profitability and long-term resource stewardship.

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This discussion examines a research study focused on improving long-term profitability in cow-calf operations through better heifer selection. The study used economic modeling and field data to evaluate three key factors: feed efficiency, longevity, and heterosis (hybrid vigor). Results showed that cows with greater genetic diversity consistently generated higher returns, largely due to improved reproductive performance and overall herd productivity.

Longevity also played a critical role, as cows that remained productive in the herd longer were able to spread their development costs over more calves. However, the study revealed that heterosis had a larger impact on profitability than longevity alone when multiple factors were considered together. Feed efficiency, measured as the ability to maintain condition on less forage, also contributed positively to economic outcomes, particularly during winter feeding periods.

An important takeaway is that assumptions from feedlot cattle efficiency do not always translate directly to grazing cows due to differences in diet and digestion. The discussion also emphasizes the importance of crossbreeding strategies, warning that repeatedly using similar genetics can reduce hybrid vigor over time. Overall, the episode highlights that strategic heifer selection—focused on genetic diversity, reproductive success, and efficiency—can significantly improve herd profitability over the long term.

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This episode explores a research study evaluating whether sterile saline can effectively replace phosphate-buffered saline (PBS) for collecting samples used in Tritrichomonas PCR testing. The discussion highlights a non-inferiority trial design, which differs from traditional statistical approaches by testing whether one method is not meaningfully worse than another. Researchers created controlled samples with varying concentrations of organisms and compared detection results using both saline and PBS.

Results showed no significant difference in detection performance between the two media, and saline met the criteria for being “not inferior” to PBS. This finding is important because saline is more readily available and easier to use in field conditions for veterinarians.

The discussion also explains how PCR cycle threshold values work and why small differences can matter depending on diagnostic cutoffs. However, the applicability of these findings depends on the specific testing method, as saline may not perform as well in DNA-based PCR due to potential degradation. Overall, the study provides practical insight into improving diagnostic efficiency while emphasizing the importance of understanding both statistical methods and biological relevance in veterinary research.

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This discussion explores the concept of systems thinking in beef cattle production and how it expands beyond traditional population medicine approaches. Systems thinking focuses on understanding how multiple interconnected factors—such as nutrition, environment, disease exposure, and management practices—interact over time to influence herd health and productivity. Many cattle health and performance issues develop gradually, often involving delayed cause-and-effect relationships that can span months or even generations. The approach also recognizes that cattle may pass through multiple owners or environments, meaning problems observed in one setting may have originated earlier in the system. Rather than targeting a single cause, systems thinking addresses multifactorial “syndromes” where several influences combine to create outcomes like disease or poor reproduction.

Key elements include ensuring proper nutrition, maintaining good environmental conditions, and aligning management decisions—such as breeding timing—with forage availability. The concept emphasizes that yearly outcomes are interconnected, with current management decisions affecting future herd performance. In stocker operations, additional complexity arises from combining cattle from different sources and managing land across multiple production cycles. Practically, systems thinking encourages producers to identify “pinch points” such as water access, cattle arrival stress, and housing conditions. Ultimately, it provides a framework for long-term problem solving, focusing on improving the entire production system rather than reacting only to visible health events.

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