VETERINARY

The Smell You'll Never Forget: A Calf Infested with New World Screwworm

Thu, 10 Jul 2025 16:41:22 GMT

“The stench…it’s like roadkill stewed in infection,” explains Jose Santiago Gallardo Espinosa, a cattle producer from Chiriqui, Panama, describing an animal that has been infected with New World screwworm (NWS). “You’ll smell it before you see it.”

He goes on to describe the appearance. “That little dehorning scrape you didn’t worry about? Now, it’s a fist-sized hole pulsating with maggots. Not on top, under the skin. Hundreds of cream-colored worms with screw-like spines, eating your cow alive.”

It’s a Plague in Panama

Gallardo is a Panamanian livestock production specialist and animal science professional with a diverse and practical background in cattle production, agricultural policy and international ranch management. He currently serves as the technical assistance team manager at Cooleche, R.L., where he leads strategic initiatives in cattle production and technical outreach.

“⁠This ain’t ‘just flies.’ We’ve buried calves eaten alive in 48 hours,” Gallardo stresses. “Post-calving cows are sitting ducks, I found one last week with maggots deep in her vulva, she was trembling as she tried to nurse her calf.”

An animal health professional treating an animal in Panama that has been infected by New World Screwworm.

(Jose Santiago Gallardo Espinosa)

To catch NWS and stop the spread, Espinosa encourages daily wound checks including navels on newborns, vulvas on fresh cows, sheaths on bulls, branding cuts and tagging nicks. Some red flags include a wound that swells overnight or oozes cloudy fluid and a milk tank mysteriously dropping.

“Treat every scratch like a ticking bomb,” he says adding if you find one with a wound acting a little strange, you should “peel back skin edges, and if you see rice-grain maggots with dark spines — sound the alarm.”

He says more than 6,500 cases have erupted across Panama, marching north through Central America like a plague.

“For years, our U.S.-Panama barrier kept NWS at bay,” Gallardo says. “We’d see maybe 25 cases a year — it was a nuisance, not a crisis. Then 2023 hit, and overnight our pastures became war zones.”

He says the reality in Panama is rainy season is maggot season.

“Here, in Chiriquí’s dairy country, it is the perfect storm,” he says. “Rainy season humidity of 90%, 85°F heat and flies everywhere. A single-infected cow bleeds $10/day in lost milk — its life or death for small dairies.”

NWS in Nicaragua

Ernesto José Sequeira Enríquez, an agronomist from Camoapa, Nicaragua, says NWS was eradicated from Nicaragua in the 1990s. He says he first encountered it during an internship in Brazil where he experienced the serious challenge the fly causes.

“When cases began appearing here again last year, I was able to use what I learned in Brazil to prepare veterinary supplies and train people on prevention and treatment,” he explains.

(Ernesto José Sequeira Enríquez)

He says it’s essential to enforce a daily inspection routine, checking every animal carefully for open wounds.

“When you find an infected animal, you’ll typically see a bleeding wound,” Sequeira says. “If the infestation has progressed, there will be a strong, foul smell due to tissue damage and the presence of larvae.”

He encourages U.S. producers to be prepared with sufficient supplies of veterinary medicines and insecticides for both treatment and prevention and to adjust management practices to reduce risk. For example:

When dehorning, branding or ear tagging, apply insecticide spray to the wound immediately.
Ensure proper care of newborn calves by disinfecting the navel with iodine solution as soon as possible, since that is the most common entry point for infestation.

“Although complete control of screwworm is not possible, taking preventive measures significantly reduces the economic and productivity impact of it,” he says. “Early detection and consistent preventive practices are critical to minimizing losses.”
Sequeira stresses a producer’s eyes and hands are their best tools to fight NSW.

“My warning to U.S. ranchers is this isn’t just a Panama problem,” he summarizes. “Newborn calves are maggot magnets. If you lose one calf to a navel infestation, you’ll never sleep again. Make inspections sacred — no excuses. Report fast and hide nothing.”

It’s Endemic in Brazil

Marcelo Costa is a veterinarian, professor and cattle business consultant in Brazil and Paraguay. In 1999, Costa was taught embryo transfer at Camp Cooley in Franklin, Texas. He then returned to his family’s third generation ranching operation where they started Camp Cooley Brazil.

“I have been dealing with screwworm all my life since it is endemic in Brazil,” Costa says. “Screwworm-infected animals happen all months of the year.”

A wound in the animal skin full of screwworm and new fly eggs in the skin borderline

(Marcelo Costa)

Like others, he has experienced finding infected animals with bleeding, foul-smelling wounds. He says animals show discomfort and may not follow the herd as normal.

“Newborn calves are usually the more attacked category because of the navel’s wet and bloody tissue,” he says. “If a screwworm infects the navel, it may open a door at the site for more severe infections that may cause diarrhea, pneumonia and other diseases.”

Costa stresses how much NWS costs producers beyond animal loss and decreased productivity.

“One of the biggest problems with NWS is the increased labor with vigilance and animal treatment,” he summarizes.

Guatemala Producers Are Learning to Cope with NWS

“Screwworm came to teach us the times are changing, and that any type of production is possible and open to any complication,” says Oscar León, a livestock production specialist and agricultural business administrator from Guatemala City, Guatemala. “Brazil learned how to cope with it, and Guatemala is in the process of it. The U.S. is not exempt from it, unfortunately. But with the adequate measures and prevention techniques, one can learn and teach others. We can make the impact less harmful on our production and wallets.”

(Oscar León)

León currently manages his family’s cattle operations and leads LAVAT S.A., a company that imports and distributes innovative animal health and nutrition products tailored to the needs of the Guatemalan livestock sector.

He explains it is important for producers to look for and treat any open wound or bruise as they are the first indicators.

“If an open wound smells like the scent of rotten meat, you will find the presence of screwworms feeding off live tissue,” he says. “Prevention and early timing are the best ways to treat screwworm. Make sure to take your time, observe your cattle, search for a bruise or wounds and treat them properly.”

He also stresses the importance of making sure everyone who works in the farm or ranch is aware of NWS and knows how to react if an infection is found.

Educating U.S. Producers

Chris Womack, a veterinarian and rancher from San Angelo, Texas, says he remembers helping his dad treat calves with NWS infestations.

“I can still remember the smell,” Womack says. “I thought it was cool because I was a little kid, and we dug maggots out of the calves. I can still smell it like it was yesterday, and it was horrible to look at them.”

Womack shares a historic context of NWS, which he says means “man-eater,” on the “Registered Ranching” podcast with Tucker Brown.

Womack also describes the emotional toll on the producer when faced with NWS.

“If you’re a steward of an animal and it has half of its head rotting off, or its abdomen is a gaping wound because the maggots are eating it up, or it gets in their ear and they’re walking around in circles with brain damage because they got meningitis, well, it’s devastating.”

Womack summarizes NWS isn’t just an agricultural issue, it’s a human health concern. Historical accounts and recent data from Panama show NWS can affect humans, particularly vulnerable populations like homeless individuals or those in areas with limited medical access.

Womack says the experiences with NWS during his childhood is the reason he is a veterinarian today. He says there is a generational ignorance in the U.S. regarding NWS, and that is something he is committed to fixing.

“The only way we can overcome ignorance is education,” he stresses.

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More Than Annoyance: Flies Can Impact Health and Profits

Tue, 06 May 2025 15:16:34 GMT

With fly season approaching, now is the time to evaluate and refine your fly management plan for 2025.

“If your 2024 control efforts underperformed, consider adjusting your approach,” says David Boxler, Nebraska Extension livestock entomologist. “The best control method will depend on several factors including efficacy, cost, convenience and your current herd management practices.”

He also reminds producers that horn flies can migrate from neighboring untreated herds, masking the effectiveness of your efforts and increasing fly pressure. For this reason, Boxer recommends a comprehensive, integrated fly control.

The horn fly is one of the most damaging pests of pasture and rangeland cattle across the U.S., Boxler says in a recent “ UNL Beef Watch .”

“Adult horn flies are blood-feeding insects that take an average of 30 blood meals per day,” he says. “Their populations can build rapidly and often exceed the Economic Injury Level defined as 200 flies per animal. Once fly numbers surpass this threshold, cattle experience reduced weight gain and milk production due to fly-induced stress and altered grazing behavior.”

Observing your cattle during summer months is key to detecting fly pressure. Boxler asks, “Are they constantly tossing their heads, swishing their tails or twitching their skin?”

These signs of fly irritation indicate a more effective control strategy might be needed.

“If you are seeing flies, ticks, lice or insect damage to your cattle herd, we know there is an economic impact; however, that impact can become far greater than production or weight gain loss alone,” says Ashby Green, DVM, Neogen senior technical services veterinarian. “Insect pressure affects grazing patterns of cattle, it affects their comfort and it can lead to health issues. Some of those health issues can be definite, such as anaplasmosis.”

The vectors responsible for spreading anaplasmosis include horse flies, stable flies and ticks. This condition has been reported in most states across the U.S., while the disease has been recognized as endemic throughout the South and several Midwestern and Western states.

“With horn flies, we’re looking at mastitis risk, so that’s going to impact both dairy cattle and also our cow-calf operations,” says Jonathan Cammack, Oklahoma State University assistant professor and state extension specialist. “A lot of times, horn flies will feed on the udders of the animals, and they transfer the Staphylococcus aureus bacteria because they land on the manure, then they go back to the animal to feed and bring those bacteria with them.”

Several other conditions are propagated by flies or ticks, including pinkeye, which can be spread by face flies and causes inflammation and ulceration of the eyes. Pinkeye-affected calves are, on average, 35 lb. to 40 lb. lighter at weaning compared to healthy calves, according to a University of Kentucky report.

Cammack says that due to flies, “We’re looking at probably $6 billion in losses annually to U.S. cattle production, and that encompasses everything from actual loss in production due to decreased weight gain or decreased milk production, veterinary needs associated with treatment of cattle with exposure to pathogens from some of these insects, and then also the control measures associated with managing those individual fly species.”

Ticks present economic risks as well. Cammack says that during a 100-day growing period producers can see a decrease in total weight gain in calves by about 20 lb. For stockers, over that same 100-day period during the summer months, they can experience a decrease in weight gain by about 60 lb.

“With what current prices are, 60 lb. could translate to a significant amount of money returned when we’re talking about the few dollars that it might cost for some tick control,” he says.

(Neogen)

Controlling flies and insects: Tips to implement
Now is the time to take steps to control flies and ticks, as populations emerge with the warmer weather.

In “ Stopping Flies in 2025: Tips to Battle These Economic Pests ,” Cassandra Olds, Kansas State University Extension entomologist, shares four steps to controlling flies

Know what flies you’re dealing with.
Reduce populations.
Eliminate breeding grounds.
Consider chemical control options.

Similar to Olds, Green recommends using a multi-pronged approach to insect control. Fly tags, feed-through insect growth regulator (IGR) products, pour-ons, back rubbers and dust bags can help diminish the population. A pour-on with an IGR destroys the larval development in flies and greatly reduces the fly population. For ultimate control using a pour-on, look to a unique combination of actives within one solution that includes an IGR, an adulticide, and a synergist that supplies relief to cattle from infestations and provides producers with a reliable solution that helps minimize handling, time and labor costs.

“Both back rubbers and dust bags can be highly effective if managed correctly. Keep in mind, when these are put out to withstand the elements, including moisture and rain, it’s key to keep the dust fresh or the oil recharged in your back rubbers. Otherwise, they will diminish in their ability to control flies quickly,” Green advises.

Cammack stresses the importance of accurate dosing by the individual animal’s weight and following label guidelines.

To best control flies and insects on cattle operations, “the easy and effective way is the best way,” Green summarizes. “It’s up to you and with the help of your veterinarian to help create that combination.”

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Your Veterinarian: A Critical Farm Partner for Success

Thu, 24 Apr 2025 21:12:00 GMT

When it comes to livestock production — whether beef, dairy or swine — a knowledgeable large-animal veterinarian is a critical resource for producers.

The veterinarian’s duties have grown through the years from emergency calls and service to now include consultation and planning to improve cattle and dairy herds as well as swine operations.

Craig Bieber of Bieber Red Angus in Leola, S.D., says working with a vet is essential to his herd’s success.

“I don’t know how people do it without a relationship with their vet,” Bieber says. “A good working relationship is so important. As producers, we can’t be on top of every animal disease or problem there is.”

Bieber says he is lucky to have a comprehensive clinic with five veterinarians near his ranch. He meets with his team of veterinarians three or four times per year to discuss health strategies.

“Our diversified livestock operation uses a team of veterinarians for the health and well-being of our cattle, swine and sheep plus our livestock guardian dogs and family pets,” says Sarah Jones of Red Hill Farms in Lafayette, Tenn.

The Jones family works with its primary veterinarian, Roger Thomas of Thomas & England Veterinary Services in Smiths Grove, Ky.

“Dr. Thomas is essential to our operation,” Jones says. “Without our team of veterinarians, we couldn’t provide the very best care for our livestock. Dr. Thomas is our first call for issues we are not comfortable treating without consultation. Our operation also uses additional veterinarians for pregnancy ultrasound, cattle embryo transfer, sheep artificial insemination, sheep embryo transfer and swine consulting.”

In an unscientific survey, Drovers asked its Facebook followers, “How important is your veterinarian to the success of your operation?”

One follower wrote, “Essential. Having our veterinarian of a little over 40 years, we have created herd health programs for pre-breeding and pre-calving, as well as vaccination programs for calves at birth and weaning. We review these programs every year.”

Another said, “Our vet from Vale Veterinary Clinic is key to the success of our program through integrated research and herd health management our vet is priceless!”

Unfortunately, a few respondents noted they don’t have a close large-animal veterinarian near them or that they must take individual animals to an equine veterinarian for consultation, affirming the need for more large animal vets.

(Farm Journal)

The evolving role of dairy veterinarians

Traditionally seen as the guardians of animal health, focused primarily on treating sick individual animals, today’s dairy veterinarians are expanding their roles.

Scott Bohnert of Bohnert Jerseys in East Moline, Ill., exemplifies the modern dairy farmer’s reliance on veterinary expertise. At his dairy, home to 700 Jersey cows and an equal number of replacements, Bohnert leans heavily on his long-time veterinarian, Ryan Schaefer of Blue Grass, Iowa. Their working partnership of more than 15 years highlights the evolving importance of veterinarians in dairy.

Schaefer collaborates closely with Bohnert, conducting routine herd health and pregnancy checks twice a month — but their relationship goes far beyond basic animal care.

With a deep understanding of the dairy industry’s challenges, Schaefer consults closely with Bohnert on various critical topics. This trusted advice plays a pivotal role in helping Bohnert and his team drive their dairy operation forward.

“Ryan and I work very well together,” Bohnert says, acknowledging how Schaefer’s insights into disease prevention, vaccine management and industry trends keep his farm thriving in a competitive market.

This collaboration reflects a broader trend in agriculture where veterinarians serve as essential consultants instead of just animal doctors. Their role extends to strategic decision-making, helping farms navigate through diverse challenges like disease outbreaks, regulatory changes and economic pressures.

Swine veterinarian’s critical role

The swine producer and veterinarian relationship is critical in managing health issues in the swine herd.

“I can’t overstate how important our farm’s relationship is with our veterinarian,” says Mike Paustian, a swine producer from Wolcott, Iowa. “We treat that relationship as one of the key parts of our team that we’ve assembled to help advise our farm.”

Paustian, who is contact with his veterinarian every week, challenges the misconception that veterinary involvement is costly.

“I don’t see how you’re going to get a bigger bang for your buck than getting a veterinarian who knows your herd, to provide input into issues you’re having,” he says.

Paustian says he also appreciates a veterinarian who approaches work with a sense of curiosity and a desire to understand things better, which aligns with his own approach to constantly seek improvement.

Ben Barcovtch, a pig farmer from Berwick, Pa., says a strong veterinarian relationship is essential to the success of his pork operation.

“They support proactive herd health, help improve productivity, strengthen biosecurity and provide expert guidance during health challenges,” Barcovtch says. “The vet practice I work with is a key partner in maintaining animal well-being and our overall profitability.”

The veterinarian-client-patient relationship (VCPR) is the basis for interaction among veterinarians, their clients and their patients, and it is critical to the health of animals.

“Our VCPR is a partnership that allows more proactive and long-term strategies instead of just responding to needs as they arise,” says Rob Brenneman, owner of Brenneman Pork in Washington, Iowa. “This allows both parties to focus on preventative care, optimized service offerings focused on system health and stability.”

Thank you

April 26 is World Veterinary Day . Observed annually on the last Saturday of April, the day aims to celebrate the contributions of veterinarians to the health of animals, people and the environment. “Animal health takes a team,” is this year’s theme and summarizes the collaboration between veterinarians and beef, dairy and swine producers.

“I believe that sincerely communicating appreciation is one of the most important things farmers and ranchers can do for their veterinarians,” says Jones of Red Hill Farms.

Veterinarians are considered trusted advisers with an integral role in the livestock industry. A recent survey released by Boehringer Ingelheim shows 94% of animal owners appreciate the work of veterinarians, compared to only 49% of veterinary professionals feeling who think the profession is appreciated.

The survey is part of Boehringer Ingelheim’s “Going Beyond” campaign, which seeks to spotlight aspects of veterinary work that too often remain unseen and underrecognized.

In support of World Veterinary Day, the “Going Beyond” campaign also released a video asking animal owners to guess what type of professional meets the description of a range of compelling job responsibilities and characteristics.

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Challenges and Rich Rewards of Working with Family

Wed, 18 Nov 2020 01:26:34 GMT

People say “you can choose your friends, but not your family.” We could turn that expression around though and say “you can choose to be friends with your family.” That step could be especially important if you also choose to work with family every day in veterinary practice.

That was a choice Jim Furman, DVM, MS, and his son Tom Furman, DVM, MS, made 11 years ago when Tom returned to join the family practice, the Animal Center, in Alliance, Neb.

Along with the father and son relationship, the women in the family also play key roles in the practice. Tom’s mother, Penny Furman, has managed the clinic office for years, handling billing, payroll and scheduling. Now Tom’s wife Stephanie Furman, who has a master’s degree in ruminant nutrition and has managed a research feedlot, also works in the office and assists in all those tasks. All four enjoy socializing together in their off time, even after working together all day.

Jim says his parents worked together in a non-veterinary business, and he watched their mutual support help the business grow, so he grew up believing family members could work together successfully. He also understands the value of mentors in professional life. Soon after he completed vet school in 1976, he purchased a local practice from a veterinarian who was ready to retire. That veterinarian helped mentor him for several years before Jim moved on and, with his wife, built the Animal Center clinic. That experience helped drive his later recommendation for Tom to go out and learn from experienced mentors before returning to the practice.

Tom says he was raised in the practice, helping out with walking dogs, cleaning kennels and watching procedures, beginning when he was about 5 years old. The family home was, and still is, adjacent to the clinic, and the practice always was a family affair. Today, Tom’s children — Jim’s grandchildren — are being raised the same way as Tom and his siblings, spending time around the clinic, taking care of dogs, cleaning facilities and helping out with other chores.

Tom says his two siblings also were interested and involved in the practice, but he was the one who decided early on he wanted to become a veterinarian. He became increasingly involved with the practice during high school, accompanying his father on after-school calls and assisting with surgeries.

Tom went on to complete the pre-vet program at the University of Nebraska and earn his DVM degree at Kansas State University. “With dad’s encouragement and my family’s support I went on to complete a master’s degree in epidemiology and statistical medicine from UNL in 2014,” he adds.

Experience first

Upon graduation in 2004, Tom felt he was ready to return home and join the family practice. His father, though, had a different idea. Jim knew that most young veterinarians do not stay with their first employer long and often change practices several times before settling in for the long term. He wanted Tom to experience a variety of veterinary practices and services, and learn from a variety of established veterinarians, before making a decision about joining the family practice. With the help of University of Nebraska veterinarian Dee Griffin, he developed a list of potential mentors around the U.S. and Canada.

Using that list, Tom planned a year of traveling and pursuing short internships with those mentors. He spent time in a large small-animal practice in Las Vegas, worked with a group of feedyard consultants in Canada, learned equine medicine in Colorado, practiced palpating cows at an Oklahoma sale barn and learned about bovine reproduction in South Dakota.

Over the course of that year, Tom says he learned a great deal from multiple mentors; gained exposure to and experience in a variety of practices, environments and animal species; gained a great deal of confidence; and developed a different, broader view of veterinary medicine and mixed-animal practice.

Throughout that internship year, Tom says his father stressed that he should not feel obligated to return to the family practice. If, during his travels, he found an employment opportunity he wanted to pursue, he should pursue it. “I told him if he found another opportunity, to take it,” Jim says, adding that he was anxious for Tom to join the practice but wanted it to be his decision. But, Tom says, while his experiences helped him develop skills and broaden his outlook, he was more determined than ever to apply those skills back home in Nebraska. He saw it as an opportunity to sustain and build a rural practice that provides vital services to the community, in an area where retiring veterinarians outnumber new practitioners.

Overcoming challenges

Once in the practice, Tom says he and Jim had numerous conversations regarding the business model, standards of care and other topics. He adds that while Jim was able to approach these topics in an academic, peer-to-peer manner, the two did not always agree, and it took time to define roles and establish a professional relationship distinct from their father-son relationship.

That first year, he says, was challenging and a learning experience for both. The key to success, he says, “is we both wanted it to work.” After that first year, Tom says, the two had established boundaries and learned to effectively communicate, and the practice became more fun.

Jim acknowledges there were some “bumps in the road” for the first year, and credits his wife with mediating disputes and providing a calming influence.

The two work together in consulting with their larger feedyard and cow–calf clients, and Tom says those clients feel comfortable with a gradual transition from the older to younger generation.

Over the past 11 years, Tom has pursued change and growth in the practice, encouraging his father to adopt newer technologies such as digital X-Ray equipment, ultrasound and a paperless system for records and billing. Jim, he says, has shown willingness to change and accept new technologies, but only when someone can demonstrate the change will benefit the practice. He is methodical in making decisions, Tom says, and doesn’t just jump on the latest bandwagon. Tom says he has come to appreciate that approach and plans to continue that approach as he takes on more management responsibilities in the practice. “We’ve worked to find a balance,” he says, between wanting to modernize with new equipment and services, and the need to objectively evaluate how potential investments will benefit the practice and its clients.

Jim says Tom has helped what seemed like a “mature practice” to evolve, modernize and position itself for ongoing success.

Successfully working together as a family, Tom says, requires faith, respect, love, the desire to succeed and a lot of communication.

Communicating with family farmer clients

Tom notes that among the ranching and cattle-feeding families in the area, he has seen many where generational transitions create challenges. In some of these cases, sons or daughters return to the family operation following school but find their parents or grandparents are reluctant to involve them in decisions, listen to their ideas or share any management responsibilities. The older generation, he says, might not appreciate new ideas, while the younger family members might not respect proven methods, leading to conflict.

Jim witnessed the same phenomenon when he moved back to his home town to begin veterinary practice. Young people he knew were returning to their family farms and ranches, where they were put to work but given few real responsibilities. In the early 1990s, he began organizing “Cowboy Colleges” intended for younger people. He brought in experts on numerous subjects including range management, animal health, reproduction cattle feeding and other topics. A primary goal, he says, was to provide young producers with knowledge, ideas and tools that could help them become more involved in management decisions on their family’s operations. For younger members of a family business to succeed, he says, they need to feel they have some ownership in the business and the way it operates.

Tom believes his experience in practicing with his father helps him communicate with clients who experience those challenges.

Jim says he takes great pride in having a son follow in his footsteps and is pleased they worked things out early to make the relationship work, so they could enjoy their years practicing together. “I thought I wanted to retire at 55,” he says, “but now I’m still enjoying the work and want to stay involved.” Even once he scales back on actively practicing, he anticipates helping out around the clinic and spending time talking with clients.