Month: September 2026

When Fly Spray Turns Toxic: A Costly Insecticide Mixing Mistake

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This case study examines a situation where a producer attempted to control a heavy fly burden by spraying cattle with a topical insecticide, only to have several cows develop severe toxic signs within hours. Affected animals became recumbent, excessively salivated, developed diarrhea, experienced respiratory distress, and showed muscle tremors and weakness, raising immediate concerns about insecticide toxicity.

The investigation focused on two common groups of insecticides used in cattle: organophosphates and pyrethroids. Because the cattle exhibited the classic “SLUD” syndrome of excessive salivation, lacrimation, urination, and defecation, the evidence pointed strongly toward organophosphate poisoning. Review of the product label revealed that the insecticide had been mixed at a dramatically higher concentration than recommended. Instead of being diluted according to animal-use directions, the concentrate was mixed at a strength far closer to premise-spray concentrations, resulting in massive overdosing.

The discussion highlights how many insecticide products contain multiple sets of directions depending on whether they are being used on facilities, back rubbers, or directly on animals, making careful label review essential. Once toxicity was identified, treatment focused on immediately washing cattle with detergent and water to remove residual insecticide from the skin and administering atropine to reduce secretions and support breathing.

Fortunately, the affected cattle recovered after treatment, demonstrating the importance of rapid recognition and intervention. The case serves as a reminder that insecticides are highly potent compounds designed to affect nervous system function and must be handled with extreme care. Proper dilution, careful reading of product labels, and attention to species-specific application instructions are critical to preventing potentially fatal mistakes during fly control programs.

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Antibiotics, Antimicrobials & Recovery: New Insights in Beef Cattle Health

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In this episode of Cattle Chat, the team discusses post-treatment intervals for cattle treated for respiratory disease, featuring graduate research from our guest Katherine Shirley comparing three- and six-day intervals. The results suggest that allowing cattle more time to recover before retreatment may reduce treatment failures and the likelihood of chronic issues.

The conversation also explores the distinction between antibiotics and antimicrobials, antimicrobial resistance, and emerging alternatives such as probiotics, prebiotics, essential oils, plant extracts, and other natural compounds. The group discusses research into alternatives for rumen health and liver abscess prevention, including promising work with sorghum extracts. Throughout, the experts emphasize that successful cattle recovery involves more than drug selection—it also depends on nutrition, environment, comfort, and proper nursing care.

This episode is sponsored by Virbac. Learn more at virbac.com

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How Heritable Is Fertility in Beef Cattle?

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In this episode of Bovine Science, we examine a 2024 Journal of Animal Science study that used hundreds of thousands of cattle records to investigate the genetic and environmental influences on fertility in beef cattle. The study evaluated traits including calving date, calving interval, first-calf interval, early calving, and heifer pregnancy.

The discussion highlights that most fertility traits have very low heritability, meaning management decisions such as nutrition, body condition, breeding-season length, and bull fertility have a much greater influence on reproductive performance. Heifer pregnancy was the exception, showing moderate heritability and providing a potential opportunity for genetic selection. The study also found no evidence that selecting for greater weaning or yearling weight negatively affects fertility, with yearling weight actually showing a positive association with heifer pregnancy.

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Setting Calves Up for Success: Early-Life Health, Vaccination, and Management

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This episode is sponsored by Boehringer Ingelheim and focuses on the importance of early calf health and how management decisions made before and shortly after birth can influence lifetime performance. The discussion emphasizes that calf success begins long before calving, with proper nutrition, body condition, and vaccination programs for cows playing critical roles in producing healthy, vigorous calves. Dr. D.L. Step highlights the importance of preparing cows to provide quality colostrum and a strong immune foundation for newborn calves.

The group discusses how pre-weaning disease can have long-term impacts on growth and productivity, making prevention a key management goal. Beyond vaccination itself, the speakers stress the importance of proper vaccine handling, including correct storage temperatures, avoiding disinfectant residues in syringes, and using modified-live vaccines within the recommended time after mixing. Mishandling vaccines can reduce their effectiveness even when the correct products are selected.

The conversation also explores the role of stress management in successful vaccination programs. Calves respond better when they are handled quietly, maintained on an adequate nutritional plane, and processed in low-stress environments. The speakers note that vaccine response is influenced not only by the product itself but also by calf age, maternal nutrition, colostrum intake, and overall herd management.

A recurring theme is the value of recordkeeping, which allows producers to evaluate outcomes, identify trends, and continuously improve their health programs over time. Ultimately, the episode concludes that successful calf health programs rely on combining sound nutrition, effective vaccination practices, careful handling, and long-term management planning rather than relying on any single intervention.

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A New Approach to Mycoplasma Control: Evaluating a Modified-Live Vaccine in Young Calves

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This episode reviews a 2026 study investigating whether a modified-live Mycoplasma bovis vaccine can help protect young calves from one of the most frustrating respiratory disease pathogens in the cattle industry. The researchers conducted a controlled challenge trial in neonatal calves, comparing vaccinated and non-vaccinated groups after exposure to Mycoplasma bovis.

The results showed several encouraging outcomes for vaccinated calves. They experienced fewer lung lesions, fewer days with fever, and a shorter duration of clinical illness compared with non-vaccinated controls. In addition, vaccinated calves developed higher antibody levels both before and after challenge, suggesting that the vaccine stimulated a meaningful immune response.

The discussion also highlights important statistical considerations. While the study found positive effects on lung lesions and fever duration, some clinical disease measures showed less dramatic differences, emphasizing the need to carefully interpret challenge-study data. The hosts point out that challenge trials measure vaccine efficacy under controlled conditions, which differs from vaccine effectiveness in real-world ranch environments.

Another key point is that the study was funded and conducted by researchers affiliated with the vaccine manufacturer, making critical evaluation of study design and interpretation especially important. Despite those limitations, the trial was well designed, with randomization, blinding, and strong biosecurity controls. Overall, the paper provides promising evidence that a modified-live Mycoplasma bovis vaccine may become a useful tool for respiratory disease management, while also underscoring the need for larger field studies to determine how well those results translate to commercial cattle operations.

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Estrus Intensity Matters: Using Heat Activity to Improve Reproductive Success

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This episode is sponsored by Estrotect and features Dr. George Perry from Texas A&M AgriLife, who discusses how estrus intensity influences reproductive performance in beef cattle and how producers can use that information to improve breeding decisions. While many producers think of estrus as a simple yes-or-no event, the discussion highlights that the intensity of estrus, measured by mounting activity or other indicators, can provide valuable insight into fertility. Calves and cows that exhibit stronger estrus prior to fixed-time artificial insemination consistently achieve higher conception rates than those showing weak or no signs of estrus.

The conversation explains that estrus remains important even in synchronization and fixed-time AI programs, where breeding occurs on a set schedule. Research has shown that cattle displaying estrus before insemination can have conception rates more than 20 percentage points higher than those that do not. This information can help producers make more strategic decisions about which animals receive sexed semen or higher-value genetics.

The group also emphasizes that management factors such as nutrition, body condition score, postpartum interval in cows, and puberty status in heifers often have a greater influence on estrus expression than genetics alone. Advances in estrus detection technology, including activity monitors and improved heat-detection aids, now provide producers with more detailed information than traditional visual observation methods.

Ultimately, the discussion concludes that estrus intensity is not merely a biological curiosity but a valuable management tool. By combining sound nutrition, synchronization protocols, and improved estrus detection, producers can make better breeding decisions that improve conception rates, calf performance, and the long-term productivity of the herd.

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Solving the Toxicology Mystery: A Systematic Approach to Vague Cattle Health Problems

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This episode focuses on some of the most challenging cases veterinarians encounter: cattle with vague signs such as weight loss, poor condition, or an unexplained death where no obvious cause is apparent. Dr. Scott Fritz explains that these situations are often far more difficult than classic acute poisonings because there is rarely a clear syndrome, exposure event, or obvious diagnostic clue. Instead, investigations must begin with a thorough history, careful necropsy, and a detailed evaluation of management changes, environmental conditions, forage availability, and grazing patterns.

The discussion highlights the importance of considering toxic plants while recognizing that simply finding a toxic plant in a pasture does not prove it caused disease. Weather conditions, grazing pressure, herbicide use, mowing, drought stress, and seasonal plant growth can all influence the likelihood that cattle consume potentially toxic species. The speakers also emphasize the value of examining rumen contents, collecting representative samples, and working closely with diagnostic laboratories to choose appropriate tests rather than ordering broad, unfocused toxicology screens.

Special attention is given to ocular fluid sampling, which can serve as a useful substitute for blood testing after death and help diagnose conditions such as nitrate poisoning. The episode explains that successful toxicology investigations rarely rely on a single laboratory result. Instead, diagnosis usually comes from combining clinical signs, animal history, environmental observations, necropsy findings, pathology results, and targeted laboratory testing.

A key takeaway is that toxicology cases are often diagnoses of exclusion, requiring patience and collaboration among veterinarians, diagnosticians, toxicologists, botanists, and producers. By taking a systematic approach and preserving high-quality samples early in the investigation, producers and veterinarians improve their chances of identifying the true cause and preventing future losses.

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High Cattle Prices, Smart Investments, and Getting Started in the Cattle Business

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This episode focuses on how producers can take advantage of strong cattle prices, both by improving existing operations and by helping the next generation enter the industry. The discussion begins with ideas for reinvesting profits into long-term improvements such as water systems, fencing, grazing infrastructure, land enhancement projects, and other investments that may take years to fully pay off but can improve productivity and quality of life on the ranch.

The hosts also explore diversification strategies, including alternative livestock enterprises, hunting-related income, and other complementary businesses that can provide revenue streams not directly tied to cattle markets. A key theme is balancing short-term opportunities with long-term sustainability through careful planning and strategic investments.

The conversation then shifts to the challenges facing young people who want to enter the cattle industry during a period of historically high cattle values. The group emphasizes that aspiring producers do not need to start large and should instead look for ways to leverage labor, management skills, and relationships to gain access to cattle, land, or grazing opportunities. Examples include leasing cattle, custom grazing stocker cattle, entering partnerships, or gradually building an operation through small-scale opportunities.

The hosts stress the importance of developing a written business plan, understanding costs and potential revenue, and seeking advice from experienced professionals such as lenders, extension agents, veterinarians, nutritionists, and other producers. Building strong personal networks and identifying mentors can be just as valuable as obtaining financial capital. Ultimately, the episode encourages producers to think strategically, invest wisely during profitable times, and recognize that successful cattle operations are often built gradually through planning, patience, and strong relationships.

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