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Healthy Cows, Healthy Farms, Healthy Medicines

When people hear the term antimicrobial resistance (AMR), they often think about hospitals, doctors and human medicine. But AMR is also an important issue for animal agriculture, including the dairy industry.

For dairy farmers, antimicrobial resistance is a practical farm management issue that affects animal welfare, treatment outcomes, profitability, and the long-term effectiveness of the medicines we rely on to keep cattle healthy.

The good news is that good antimicrobial stewardship and reducing unnecessary antibiotic use aligns closely with the same management practices that improve herd performance and farm profitability. In other words, what's good for antimicrobial stewardship is also good business.

What Is Antimicrobial Resistance?

In simple terms, antimicrobial resistance occurs when bacteria become less sensitive or completely resistant to antibiotics that once worked against them.

The bacteria themselves change and adapt - this is a natural process, and most changes will be inconsequential. Repeated exposures to antibiotics though can create a selection pressure, and any bacteria that happens to survive has no competition, and is therefore more likely to be able to pass on its genetic changes. Over time, the small changes can compound, conferring some strains of bacteria 'resistance' to treatments that would have previously been effective.

The more frequently antibiotics are used, particularly when they are used unnecessarily or inappropriately, the more opportunities bacteria have to develop and spread resistance.

A One Health challenge

Public health authorities now view AMR through a "One Health" lens, where human health, animal health and environmental health are interconnected. Actions (or inactions) in one area can influence outcomes in another.

It is possible that resistant strains of bacteria that develop in a farm setting could infect humans, and vice versa. Since the antibiotics used for human health and in farming are in many cases exactly the same, this means that any new resistant strain could become problematic for health outcomes in both settings.

Added to this, it is well documented that the development of novel antibiotics has proved exceedingly challenging.

Why Should Dairy Farmers Care About AMR?

For most dairy producers, the immediate impacts of antimicrobial resistance are felt long before broader public health concerns become visible.

When antibiotics are less effective, farms can experience:

• More difficult-to-treat infections

• Longer recovery times

• Increased culling rates

• Greater disease transmission within the herd

• Higher veterinary and treatment costs

• Reduced milk production

• Increased labor requirements

• Lost income from milk discard periods

Every producer understands the frustration of treating a cow that simply doesn't respond as expected.

Where resistant bacteria are involved, a treatment failure can quickly become much more than the cost of a single tube or injection. It can lead to prolonged illness, reduced lifetime productivity, reproductive impacts, and ultimately the loss of a valuable production animal.

At the same time, many dairy systems operate on relatively tight margins. Milk withheld during antibiotic treatment and withdrawal periods represents a direct economic loss.

Reducing avoidable antibiotic use therefore delivers a double benefit of less selection pressure for resistance, and lower direct and indirect disease costs.

What Does Good Antimicrobial Stewardship Look Like?

Antimicrobial stewardship means using antibiotics responsibly and only when they are genuinely needed. It is not about never using antibiotics. Antibiotics remain an essential tool for protecting animal welfare and treating bacterial disease.

For dairy farms, stewardship typically includes several key pillars: Prevention, Selective treatment, and Monitoring & Improvement

Prevention First

The best way to reduce antibiotic use is to reduce the number of infections requiring treatment.

This includes:

• High standards of cow comfort

• Clean housing environments

• Effective ventilation

• Good transition cow management

• Strong nutrition programs

• Effective calf health systems

• Vaccination strategies

• Robust biosecurity measures

Every prevented case of disease removes the need for a treatment decision altogether.

Selective Rather Than Blanket Treatment

Modern dairy systems increasingly focus on targeted treatment approaches rather than treating every case in exactly the same way. Examples include:

• Selective dry cow therapy

• Culture-guided mastitis treatment

• Evidence-based treatment protocols

• Risk-based disease management

This approach helps maintain animal welfare while reducing unnecessary antimicrobial exposure.

Monitoring and Continuous Improvement

You cannot manage what you do not measure. Monitoring allows farms and veterinarians to identify opportunities to improve both herd health and antimicrobial stewardship. Leading dairy businesses increasingly track:

• Mastitis incidence

• Clinical cure rates

• Repeat infection rates

• Somatic cell count trends

• Antibiotic use records

• Treatment outcomes

Mastitis and Antibiotic Use

Mastitis remains one of the largest drivers of antibiotic use on dairy farms globally. Historically, treatment decisions were often made before knowing exactly which pathogen was responsible for the infection.

The challenge is that not every mastitis case requires the same response. Some infections may respond well to treatment. Others may have a high likelihood of self-cure. Some may not benefit from antibiotics at all.

Without diagnostic information, treatment decisions are often based on assumptions rather than evidence. That increases the risk of unnecessary antibiotic use.

How Mastitis Diagnostics Support Better Antimicrobial Stewardship

Rapid diagnostic technologies such as Mastatest were developed to address precisely this challenge.

Identify the bacterial strain

Rather than relying solely on clinical signs, Mastatest helps producers and veterinarians identify the bacteria responsible for individual mastitis cases and evaluate which treatments are most likely to be effective. This supports a more targeted and evidence-based treatment approach.

Instead of asking: "What do we normally treat mastitis with?", the question becomes: "What is causing this case, and what treatment is most likely to work?"

Improved diagnostic information helps ensure antibiotics are used where they add value and avoided where they do not. That is the essence of antimicrobial stewardship.

Better treat / no-treat decisions

Once the bacterial strain is identified, farm teams can make evidence-informed decisions on where treatment is likely to deliver meaningful benefits.

Diagnostic-guided treatment can help identify:

• Cases likely caused by pathogens where treatment is justified (e.g. gram-positive bacterial infections)

• Cases where alternative management or watchful monitoring may be more appropriate (e.g. gram-negative infections)

Every avoided unnecessary treatment reduces antibiotic use, withdrawal milk losses, labor costs, and resistance selection pressure.

Importantly, reducing antibiotic use does not mean compromising animal welfare. The goal is not fewer treatments at any cost - it is better treatment decisions.

Data-driven antibiotic selection

Mastatest is unique in delivering antibiotic sensitivity testing as well as bacteriological data for every mastitis case tested.

Antibiotic sensitivity testing helps determine which antibiotics are most likely to be effective against the specific bacteria involved. Having this data means you're able to confidently select the antibiotic most likely to be effective against the particular strain present for each specific case.

This could mean:

• More effective first-time cure rates

• Fewer repeat treatments or multiple-drug treatments

• Sensitivity trends can be proactively identified, and standard management strategies adjusted accordingly.

Preserving Important Antibiotics

When producers can use the most appropriate therapy first time, there is less pressure to escalate treatment or move toward broader-spectrum antibiotics unnecessarily. Protecting the effectiveness of important antimicrobial classes benefits both animal and human health over the long term.

Why Stewardship Often Improves Profitability

Some producers initially view antimicrobial stewardship as a compliance or regulatory exercise. But in reality, many stewardship practices have clear economic benefits.

Fewer disease cases means:

• Higher milk production

• Better fertility performance

• Lower culling rates

• Reduced veterinary costs

• Less labour spent managing sick animals

More targeted treatment means:

• Lower medicine expenditure

• Reduced milk discard

• Fewer repeat treatments

• Better cure rates

• Improved resource allocation

Perhaps most importantly, healthier cows tend to be more productive cows.

The same management practices that support antimicrobial stewardship, including good housing, nutrition, hygiene and disease prevention, are also among the strongest drivers of farm profitability.

Looking Ahead: Antimicrobial Stewardship = good dairy farming

Antimicrobial resistance is one of the most important long-term challenges facing both human and animal health. It is is not simply about reducing antibiotic use - it is about using antibiotics wisely.

For dairy farms, that means focusing on prevention, improving herd health, making evidence-based treatment decisions and ensuring antibiotics are reserved for situations where they deliver genuine value.

Done well, stewardship protects animal welfare, supports the long-term effectiveness of antibiotics, reduces resistance pressure and improves farm profitability.

In other words, better antimicrobial stewardship is not just good for public health. It's good dairy farming.