August 2026

Do Vaccines Affect Bull Fertility? Evaluating Breeding Soundness After Modified Live and Killed Vaccines

August 31, 2026August 20, 2026by ksubci

This episode examines a 2025 study that investigated whether modified-live or killed viral vaccines influence bull breeding soundness exam (BSE) results. The research addressed a common practical question among producers and veterinarians who are concerned that vaccination before breeding season might negatively affect fertility. Researchers randomly assigned mature bulls to receive either a modified-live or killed vaccine and then evaluated semen quality and breeding soundness multiple times over a full spermatogenesis cycle.

The study found no statistically significant differences between vaccine types for key fertility measures such as sperm morphology and motility. These findings suggest that neither vaccine type caused major detrimental effects on reproductive performance in the mature bulls that were tested. However, the discussion highlights an important limitation: the study included only 11 bulls, making it difficult to detect smaller but potentially meaningful differences between treatments.

The authors and hosts note that while some bulls consistently passed breeding soundness exams and others consistently performed poorly, these differences appeared to reflect individual animal variation rather than vaccine effects. The episode also raises questions about whether results would be similar in yearling bulls, which may respond differently than mature animals.

Overall, the study provides reassuring evidence that vaccinating mature bulls with either modified-live or killed viral vaccines does not appear to cause major fertility problems. At the same time, the discussion emphasizes that additional research with larger numbers of bulls is needed to rule out smaller effects and strengthen confidence in the conclusions.

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Maintaining Beef Demand and Building the Next Generation Workforce

August 28, 2026August 20, 2026by ksubci

This episode explores two important topics for the beef industry: long-term consumer demand for beef and strategies for workforce development. The discussion begins with a listener question about how changing cattle inventories, feed costs, and finishing weights could affect beef quality and consumer demand in the future. The hosts note that while heavier cattle and extended feeding periods have contributed to quality improvements, genetic progress has played an even larger role in maintaining high levels of marbling and eating satisfaction. They emphasize that taste, freshness, safety, and price remain the key drivers of beef demand, making it essential for producers to continue delivering a high-quality product.

The group also discusses how shifts in feed costs and cattle numbers may influence production decisions, but they do not expect a dramatic decline in beef quality because of the industry’s long-term genetic improvements and management practices. Food safety and Beef Quality Assurance programs are highlighted as critical components for maintaining consumer trust and protecting demand.

The second half of the episode focuses on labor shortages and workforce development in agriculture. Rather than expecting to hire fully trained employees, the hosts encourage producers to view workforce development as an investment, recognizing that inexperienced workers require training, mentorship, and time to become productive. They recommend creating internship or trial opportunities, partnering with organizations such as 4-H and FFA, and focusing on individuals who show enthusiasm and a willingness to learn. The discussion emphasizes that successful workforce development often requires patience, realistic expectations, and a commitment to helping employees build skills over time. Ultimately, the episode concludes that both sustaining beef demand and developing future employees require long-term thinking, continuous improvement, and a willingness to invest in future success.

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Rethinking Vitamin A in Beef Cattle: Why Calves May Be Deficient Despite Green Grass

August 24, 2026August 20, 2026by ksubci

This episode explores the role of vitamin A in beef cow-calf systems and examines why some calves develop low vitamin A levels and respiratory disease even while grazing alongside cows on green pasture. The discussion highlights that vitamin A nutrition is more complex than simply having access to lush forage, because cattle primarily consume beta-carotene from grass, which must be converted into usable vitamin A by the body.

A major takeaway is the importance of colostrum as the primary source of vitamin A for newborn calves. Because very little vitamin A is transferred across the placenta, calves are born with limited reserves and depend heavily on colostrum intake during their first hours of life. Research cited in the review shows that delays in colostrum consumption can negatively affect vitamin A status for weeks after birth.

The discussion also challenges long-standing assumptions about vitamin A requirements. Current beef cattle recommendations are largely based on research conducted decades ago, despite major changes in cattle genetics and productivity over time. Recent studies suggest that supplementation levels commonly considered adequate may not be sufficient to maintain optimal vitamin A status in modern cows or their calves.

One particularly striking finding is that even when cows received vitamin A supplementation at nearly three times traditional recommended levels, about 20% of calves still failed to achieve adequate vitamin A status. The authors suggest that late gestation nutrition deserves greater attention because maternal vitamin A status strongly influences the amount transferred through colostrum. Overall, the episode emphasizes that vitamin A management remains an unresolved area in beef production and may play a larger role in calf health and disease resistance than previously recognized.

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Finding Value in Every Class of Cattle: Records, Flexibility, and Management Decisions

August 21, 2026August 14, 2026by ksubci

This episode features Nebraska cattle producer Rylee Blomenkamp, who discusses how her family’s operation manages a diverse mix of cattle, including feeder calves, yearlings, bred cows, open cows, bulls, and other opportunistic purchases. A central theme is the importance of identifying value in different classes of cattle and adapting management strategies to changing market conditions. Rylee explains that their operation succeeds by remaining flexible and taking advantage of opportunities that arise in local auction markets rather than focusing on a single type of livestock.

The discussion highlights the role of detailed recordkeeping in evaluating profitability across multiple enterprises. Rather than treating the operation as one large business unit, the family tracks expenses, feed costs, and returns for different classes of cattle, allowing them to determine where value is being created and which enterprises are most profitable. Experts emphasize that even cow-calf producers can benefit from separately evaluating replacement heifers, cull cows, and feeder calves to improve decision-making.

The group also discusses the importance of keeping cattle separated by age, size, and production purpose to better manage health and nutrition. Different groups require different feeding programs, health protocols, and marketing strategies, making thoughtful organization critical to success. Nutritional management is tailored to each class of cattle, from growing calves to bred cows and finishing animals, helping maximize performance while controlling costs.

A key takeaway is that successful producers combine strong records with practical experience, using both data and market awareness to guide decisions. Ultimately, the episode emphasizes that having a plan is important, but maintaining flexibility and adapting to changing conditions is often what creates long-term profitability and sustainability.

This episode is sponsored by Ambrook.

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Can Coronavirus Vaccination Reduce Pre-Weaning Respiratory Disease in Beef Calves?

August 17, 2026August 14, 2026by ksubci

This episode reviews a 2026 Canadian study that evaluated whether vaccinating beef calves against bovine coronavirus could reduce pre-weaning respiratory disease in a commercial cow-calf herd with a history of respiratory problems. The researchers compared vaccinated and non-vaccinated calves under real-world ranch conditions, making the findings especially relevant for producers facing similar challenges. Results showed that vaccinated calves had lower odds of requiring treatment for respiratory disease before turnout, and overall disease rates tended to be lower in vaccinated groups.

The study also included an economic analysis that suggested vaccination provided a financial advantage of approximately $10 per calf through reduced treatment costs, lower mortality, and improved performance. Interestingly, one of the strongest factors associated with disease risk was not vaccination status but the calf’s birth cycle, with calves born during certain calving periods experiencing significantly different disease outcomes.

The discussion highlights several strengths of the research, particularly that it was conducted in a commercial herd rather than a controlled challenge trial, providing valuable insight into how vaccines perform under field conditions. However, the hosts also note limitations, including questions about experimental independence, blinding, and the use of a coronavirus vaccine in a manner different from its labeled route of administration.

A key takeaway is that while coronavirus vaccination may offer another tool for reducing pre-weaning respiratory disease, it should not be viewed as a complete solution. The larger lesson is that herd management systems, calving patterns, and other underlying risk factors may play an even greater role in disease occurrence than any individual vaccine. Ultimately, the episode encourages producers to combine disease-prevention tools with a broader systems-based approach when addressing respiratory disease in cow-calf herds.

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Research Frontiers and Pain Management: Improving Cattle Health Through Better Decisions

August 14, 2026August 5, 2026by ksubci

This episode features a discussion with several Beef Cattle Institute researchers who share updates on current projects aimed at improving cattle health, welfare, and production efficiency. Topics include new technologies for semen evaluation, investigations into feeding patterns associated with interstitial pneumonia and liver abscesses, machine learning tools for detecting pain in cattle, and research on how water quality affects livestock performance. These projects highlight the growing role of technology and data analysis in solving practical problems faced by producers.

The group also addresses a listener question about weaning calves from large grazing allotments where producers have limited opportunities to handle animals before weaning. Rather than focusing solely on vaccines or medications, the discussion emphasizes reducing stress through strategies such as favorable weather conditions, low-stress weaning methods, gradual adaptation to feed and water sources, and thoughtful management of the overall system.

A major segment focuses on pain management in cattle and how attitudes toward animal welfare have evolved over time. The panel discusses procedures such as castration, dehorning, branding, dystocia management, and prolapse repair, noting that pain mitigation can improve welfare even when production responses such as average daily gain are difficult to measure. Researchers argue that producers should consider broader outcomes, including animal comfort, health, recovery, and public expectations for livestock care.

The conversation emphasizes that many producers genuinely want to provide the best care possible and are often willing to use pain-control tools when practical options are available. Ultimately, the episode highlights the value of systems thinking, continuous research, and proactive management in advancing both cattle well-being and industry sustainability.

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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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