Mastitis in Dairy Cattle: The Biggest Threat to Milk Quality and How to Manage It

Mastitis sits at the top of the list of diseases causing financial losses on dairy farms worldwide. According to USDA (2021), US dairy farmers lose more than $2 billion per year from mastitis alone. Precise statistics for Uzbekistan are limited, but veterinarians consistently identify mastitis as the most common health problem on local dairy farms. What makes it especially dangerous is the subclinical form: the cow appears perfectly healthy while milk quality has already deteriorated silently.

What Is Mastitis and What Causes It?

Mastitis (mastitis, from Greek) is inflammation of the udder. It is almost always caused by bacteria entering the teat canal and establishing an infection inside one or more quarters.

Primary causative pathogens

Source: Merck Veterinary Manual, 2023

In Uzbekistan's summer conditions, the heat and moisture in bedding create ideal environments for E. coli and Klebsiella species.

Types of Mastitis

Clinical mastitis

Visible signs are present: one or more quarters are swollen, red, and warm. Milk is visibly abnormal — yellow, brown, or bloody. The cow shows pain and discomfort during milking.

Subclinical mastitis

The most dangerous form — because it is invisible. The cow looks healthy, milk appears normal. But underneath:

• Somatic cell count (SCC) is elevated: >200,000/ml
• Milk fat and protein content are reduced
• Milk delivers poor yield in cheese and butter production

Impact on Milk Quality

Mastitis significantly alters milk composition:

Sources: Journal of Dairy Science (2020); NMC (National Mastitis Council)

The downstream effects: lower cheese yield per liter, poorer butter quality, shorter shelf life, and product that does not meet quality standards for processors.

Signs and Diagnosis

Clinical signs

• Swelling, redness, or heat in one or more quarters
• Milk that is yellow, brown, or contains blood, clots, or flakes
• Cow flinching, kicking, or showing resistance to milking
• Elevated body temperature (above 38.5°C)
• Sudden drop in milk yield

Diagnostic methods

1. California Mastitis Test (CMT): A rapid field test. A reagent is mixed with a small amount of milk from each teat — gel formation indicates elevated SCC. Can be performed at every milking with minimal cost.

2. SCC measurement: Laboratory method. Ideal for monthly monitoring of herd-level udder health.

3. Bacteriological culture: Identifies exactly which pathogen is present and which antibiotics are effective — essential before treatment decisions.

Treatment

Clinical mastitis treatment principles

• Intramammary antibiotic preparations (infused directly into the teat): veterinarian-prescribed antibiotic
• Systemic antibiotic therapy: For severe cases — intramuscular or intravenous administration
• Anti-inflammatory pain relief: NSAIDs (e.g., flunixin meglumine)
• Continue milking: Milking the affected quarter frequently removes toxins and reduces bacterial load

Dry cow therapy

Applying a long-acting intramammary antibiotic to every quarter at dry-off reduces mastitis risk in the subsequent lactation by 50–70% (Merck Veterinary Manual, 2023). This is one of the highest-return investments in dairy herd health management.

Prevention: The Most Cost-Effective Approach

Milking hygiene

1. Pre-dip teat ends with a disinfectant solution before attaching the milking unit
2. Strip the first streams of milk into a separate cup — this also allows early detection of subclinical mastitis
3. Fully sanitize milking equipment after each milking session
4. Post-dip teat ends with a disinfectant solution after every milking

Housing hygiene

• Dry, clean bedding — wet bedding is an incubator for E. coli
• Change bedding at least twice per week
• Improve ventilation during hot weather to reduce humidity

Monitoring

• Monthly SCC testing for the whole herd
• Strip-test first streams at every milking
• Maintain a mastitis log — record which cow, which quarter, when, and what treatment was given

Mastitis Management in Uzbekistan

Several factors in Uzbekistan make mastitis control particularly important:

• Summer heat increases physiological stress on cows, which weakens immune function and raises susceptibility to udder infections
• Wet bedding during hot, humid periods creates the exact conditions that favor environmental pathogens
• Milking hygiene practices on smaller traditional farms are often inconsistent

The economic impact of mastitis grows in proportion to herd size and milk volume. Farms that put a systematic prevention program in place — milking hygiene, SCC monitoring, dry cow therapy — recover their investment many times over through reduced treatment costs, higher milk quality premiums, and lower culling rates.

Frequently Asked Questions (FAQ)

1. Is it safe to drink milk from a cow with mastitis?

Milk from a cow with clinical mastitis should not be consumed. Milk from antibiotic-treated cows must be withheld for the duration of the withdrawal period specified by the veterinarian (typically 3–5 days or more). Milk from cows with subclinical mastitis is often directed to processing, but quality is diminished.

2. What should the SCC be in normal milk?

Below 200,000/ml in a healthy cow. Most country export standards require SCC below 400,000/ml in bulk tank milk. Levels above 400,000/ml signal the presence of active mastitis in the herd.

3. How quickly does clinical mastitis resolve with treatment?

With correct antibiotic therapy, clinical signs typically improve within 3–5 days. However, Staphylococcus aureus mastitis frequently becomes chronic and is very difficult to cure — affected cows are often culled.

4. What should be done for mastitis prevention in Uzbekistan specifically?

Heat stress during summer increases mastitis susceptibility. Providing shade, cool water, and maintaining strict milking hygiene are the three highest-priority measures.

5. How should mastitis cases be tracked?

Every case should be recorded: date, cow identification, quarter affected, clinical or subclinical, treatment given, and outcome. FarmOps allows you to store mastitis history, track SCC trends, and link treatment records directly to individual cow profiles — making it much easier to spot patterns and evaluate herd-level udder health over time.

6. Can mastitis be completely eliminated from a herd?

Complete elimination is practically very difficult. The goal of a well-run mastitis control program is to keep SCC below 200,000/ml on average and to reduce the incidence of new clinical cases to the lowest achievable level through consistent prevention.

7. Is subclinical mastitis more damaging than clinical mastitis economically?

Yes, across the whole herd. Clinical cases are visible and get treated. Subclinical mastitis is invisible but reduces milk quality and quantity quietly across many cows simultaneously, and it goes undetected without routine SCC monitoring.

Conclusion

Mastitis is not a disease that should be managed reactively, case by case. It is a herd health challenge that must be addressed with a structured, consistent prevention program. In Uzbekistan's climate — particularly during summer — the risk is elevated, and the cost of inaction compounds over time. Every unit of effort invested in prevention saves many times that amount in treatment, discarded milk, reduced production, and premature culling.

Farms that track SCC trends, maintain milking hygiene protocols, apply dry cow therapy, and record every mastitis event are farms that control the disease rather than being controlled by it.

References

1. Merck Veterinary Manual (2023). Mastitis in Cattle. merckvetmanual.com
2. USDA NAHMS (2021). Dairy Cattle Health and Management Practices. aphis.usda.gov
3. NMC — National Mastitis Council (2023). Guidelines for Mastitis Control Programs. nmconline.org
4. Journal of Dairy Science (2020). Subclinical Mastitis and Milk Quality. Vol. 103.
5. University of Wisconsin Extension (2021). Mastitis Control in Dairy Herds. extension.wisc.edu