Mastitis in Dairy Cattle: Prevention, Detection & Treatment

By Parv Badjatiya · Published Fri Jun 26 2026 00:00:00 GMT+0000 (Coordinated Universal Time) · Updated Fri Jun 26 2026 00:00:00 GMT+0000 (Coordinated Universal Time)

Mastitis is the most economically damaging disease in Indian dairy — not heat stress, not foot rot, not even acidosis. ICAR and NDDB studies estimate it costs the Indian dairy sector ₹6,000–8,000 crore every year, mostly from a problem most farmers don't even know they have: subclinical mastitis that drops milk yield by 10–25% without showing any visible signs.

This guide covers what mastitis is, how to detect it (visible AND invisible cases), the proven NMC 5-point prevention plan, treatment options, dry cow therapy, and the practical milking-time habits that cut new infections by half.

What mastitis actually is

Mastitis is inflammation of the udder — almost always caused by a bacterial infection that enters the udder through the teat canal. The udder responds by sending white blood cells (mostly neutrophils) into the milk to fight the infection. Those white blood cells are what milk processors measure as somatic cell count (SCC).

Two clinical forms matter:

Clinical mastitis — visible signs

Easy to spot. The cow shows one or more of:

• Abnormal milk — clots, flakes, watery, blood-tinged, or pus-like
• Hot or swollen udder — one or more quarters firm, painful to touch
• Reduced yield in the affected quarter(s)
• Off-feed in severe systemic cases
• Fever (39.5°C+) and depression in toxic cases
• Visible "strip cup" abnormalities — the first few squirts of milk show flakes

Clinical mastitis demands immediate veterinary attention. It's the form most farmers know and treat.

Subclinical mastitis — invisible, far more common

This is the form that quietly destroys herd economics. The cow shows no visible signs:

• Milk looks normal
• Udder looks normal
• Cow eats and behaves normally
• But milk SCC is elevated (above 200,000 cells/ml) and yield is dropping 10–25%

Surveys of Indian smallholder dairies consistently find 40–60% of lactating cows have subclinical mastitis at any time. Most farmers don't know because they don't measure SCC. The cow keeps milking, but at 75–90% of her potential — for months on end.

How somatic cell count (SCC) tells you what's happening

SCC is the single most important number in mastitis monitoring. It measures milk white-blood-cell concentration — high SCC means the immune system is fighting infection in the udder.

SCC thresholds (per ml of milk)

Interpretation:

• Below 100,000 cells/ml — healthy quarter, no infection
• 100,000 to 200,000 — borderline; some quarters may have minor inflammation
• Above 200,000 — subclinical mastitis (international standard threshold)
• Above 500,000 — severe infection; clinical signs often present
• Above 1,000,000 — milk quality is severely compromised; processor will reject

Bulk Milk SCC (BMSCC) — the herd-level reading

When the milk processor tests your bulk tank, they're measuring BMSCC. Indian dairy co-ops increasingly publish BMSCC tiers with price premiums:

A herd that pushes BMSCC from 500,000 to under 200,000 captures a ₹2–3/L price improvement on every litre — for a 100-litre/day farm, that's ₹6,000–9,000 extra per month.

How mastitis spreads — contagious vs environmental

Understanding which pathway is dominant in your herd determines the best prevention strategy.

How to tell which is dominant in your herd

• High BMSCC + many recurrent cases = mostly contagious
• Acute clinical cases that come and go = mostly environmental
• Monsoon spike = environmental (mud, wet bedding) — see our monsoon dairy management guide
• Lactating cows affected most = contagious
• Fresh cows or just-after-calving cases = environmental (dry-period infections)

Most Indian herds have both going on. The NMC 5-point plan addresses both.

The NMC 5-point prevention plan

The National Mastitis Council 5-point plan is the global standard mastitis prevention protocol — refined over 50+ years across countless dairies worldwide. Properly implemented, it reduces clinical mastitis incidence by 50–70% within 6–12 months.

1. 1
   Pre-milking teat preparation

   Wash udder with clean water (not pond water), dry with a single-use cloth or paper, and dip teats in a pre-milking germicide (chlorhexidine 0.5%, iodine 1%). Wait 30 seconds for the dip to work, then wipe dry before attaching the milking cluster or starting hand-milking. Pre-dip reduces new infections by 30–50%.

2. 2
   Hygienic milking procedure

   Clean hands or gloves between every cow. Strip the first 2–3 squirts onto a strip cup and inspect — abnormal milk is the earliest clinical sign. Use consistent technique (no harsh stripping, no overmilking). Avoid milking cows with active clinical mastitis using the same equipment as healthy cows — milk infected cows LAST or use dedicated equipment.

3. 3
   Post-milking teat dip — the single biggest win

   Immediately after the milker comes off, dip the teats in a post-milking germicide (iodine 1%, chlorhexidine 0.5%, or a barrier-type dip). The teat canal stays open for 20–30 minutes after milking, and a post-dip both kills bacteria and creates a barrier until the canal closes. Post-dipping alone cuts new-infection rate by 40–50%. This is the single most cost-effective mastitis intervention available.

4. 4
   Dry cow therapy

   At dry-off (last milking before the 60-day dry period), administer long-acting intramammary antibiotic to every quarter of every cow ("blanket" dry cow therapy). One tube per quarter — typically cloxacillin or cephalonium. This clears existing subclinical infections and prevents new ones during the dry period when 50%+ of new infections occur. Cost: ₹400–₹1,000 per cow. ROI: 5–10× through prevented next-lactation mastitis. See our dry cow management guide.

5. 5
   Cull chronic cases

   Cows with three or more clinical mastitis episodes in a single lactation, persistent high SCC despite treatment, or Staph. aureus-infected quarters that don't clear after two treatment courses are reservoirs of infection for the rest of the herd. Selling or culling them protects the herd. Hard decision, but a chronically-infected cow makes everyone around her sick.

The 5 supporting practices (10-point expanded plan)

Beyond the core five, the expanded NMC plan adds:

6. Maintain milking equipment — check vacuum levels, replace teat liners every 2,000 milkings or 6 months whichever is sooner, sanitize after every session.
7. Manage the environment — dry bedding, dry resting area, manure removed daily. Especially critical in monsoon.
8. Monitor SCC regularly — monthly DHIA testing or quarterly California Mastitis Test (CMT) at the cow level.
9. Review records and act on data — track which cows get mastitis when, which quarters are repeat offenders.
10. Set goals and train workers — every person who milks needs the same protocol training.

Nutritional management to reduce mastitis risk

Good nutrition does not cure mastitis, but nutritional deficiencies increase susceptibility. Five specific deficiencies measurably raise mastitis incidence — fixing them is one of the cheapest things you can do.

The four "udder defence" micronutrients

The good news: a properly compounded NDDB-spec mineral mixture at 100–200 g/cow/day covers all four. The mistake is using a cheap mineral mix without verifying the Certificate of Analysis covers the trace minerals at the right levels.

Transition-period nutrition (the 3 weeks before and after calving)

This is when most new infections occur. Get this period wrong and mastitis rates climb sharply.

• Energy adequacy — under-fed transition cows go into negative energy balance, immune function drops, mastitis rates rise 2–3×. Use bypass fat at 100–200 g/day for high-yielders to maintain energy density.
• Avoid mycotoxins — aflatoxin, fusarium toxins, and ochratoxin all suppress immune function. See our aflatoxin guide and mycotoxin glossary entry. Use mycotoxin binders during monsoon and any time feed quality is uncertain.
• Body Condition Score (BCS) at calving — target 3.0–3.5. Over-conditioned cows (BCS 4.0+) and under-conditioned cows (BCS 2.5−) both have higher mastitis rates.
• Protein balance — adequate but not excessive crude protein (CP). Over-feeding protein raises blood urea nitrogen, which suppresses neutrophil function.

Feed additives with mastitis-relevant evidence

A few additives have published evidence for reducing mastitis incidence or severity. None are mandatory; they're optional supports when the basics are right.

• Live yeast (Saccharomyces cerevisiae) at 5–10 g/cow/day — improves rumen function, reduces subclinical acidosis, and indirectly supports immune response
• Organic trace minerals (Zn, Cu, Mn, Se bound to amino acids vs inorganic sulphates) — better-absorbed; published trials show 10–20% lower mastitis incidence vs inorganic forms at the same dose
• Mycotoxin binders (clay, yeast cell wall) during monsoon or with high-risk ingredients — see monsoon dairy management
• Antioxidant complexes with vitamin E + Se + biotin — biotin specifically supports teat skin keratin

These are complements, not replacements, for hygiene and dry cow therapy. The 5-point plan does the heavy lifting; nutritional support adds another 10–20% reduction on top.

Treatment options — when prevention has already failed

If a cow develops clinical mastitis despite prevention, you need to treat fast. The decision tree:

Critical warning: drug residue in milk

Antibiotic-contaminated milk is the single fastest way to lose your processor contract. Even one positive milk-residue test typically triggers:

• Rejection of the entire bulk tank load
• 30–90 day suspension of the farmer from the co-op
• Loss of 1–3 months of milk revenue

Always observe the withdrawal period stated on the antibiotic product label. Most intramammary antibiotics require 96 hours (4 days) after the last dose before milk re-enters the bulk tank. Some long-acting drugs require longer.

Use a separate bucket for treated cows' milk. Mark each treatment with a date and quarter. Many farms colour-code the cow's leg with a temporary marker so the milker physically cannot forget.

Why dry cow therapy is the most important single decision

About 50% of new mastitis infections happen during the dry period — not during lactation. Two reasons:

1. The teat canal stays open longer when not being milked regularly
2. The cow's immune response is preoccupied with calf development and colostrum production

Dry cow therapy addresses both. A long-acting intramammary antibiotic given at dry-off:

• Treats existing subclinical infections that would have flared up post-calving
• Prevents new infections through the entire 60-day dry period (long-acting formulations work for 4–6 weeks)
• Reduces post-calving clinical mastitis by 50–80% in herds with poor pre-calving prevention

Two protocols exist:

For Indian smallholder dairies starting a mastitis programme, blanket therapy is the right initial choice. Selective therapy is the long-term aspiration once monthly SCC data is consistently available.

Pathogen-specific concerns

Different bacteria need different responses. The most common Indian mastitis pathogens and what they mean:

Knowing which pathogen dominates your herd requires milk culture — a lab test. Most progressive vets can arrange this, and the result shapes the whole prevention strategy.

Healthy cow vs mastitis cow — what to look for

Common myths about mastitis

Economic cost — putting numbers on the loss

Per affected cow per lactation, mastitis costs an Indian dairy farmer:

For a 10-cow herd with 50% subclinical mastitis prevalence (typical Indian smallholder dairy), the annual cost is ₹75,000–₹2,00,000. The NMC 5-point plan typically costs ₹2,000–₹5,000 per cow per year to implement properly. The ROI is overwhelming.

Monsoon spike and seasonal prevention

Indian dairy mastitis rates roughly double between May and August for three reasons:

• Wet, muddy ground keeps teat skin soft, cracked, and contaminated
• Flies and mosquitoes mechanically transmit bacteria from infected to healthy animals
• Cold, damp bedding raises environmental pathogen counts 100–1000×

Pre-monsoon discipline matters more than anything. See our monsoon dairy management guide for the pre-monsoon checklist that protects mastitis rates through the wet season. The most important monsoon-specific habits:

• Daily bedding renewal — wet bedding is the single biggest controllable variable
• Pre-milking teat hygiene is non-negotiable — wash, dry, dip, every milking
• Fly control — sprays, traps, ear tags
• Weekly footbath with copper sulphate to keep cow legs clean
• Watch the bulk tank SCC — rising over 2–3 weeks is your earliest warning

Putting it all together — a starter mastitis programme

If you've read this far and your herd doesn't currently have a mastitis programme, here's the minimum 90-day rollout:

1. Week 1: Order pre-milking dip, post-milking dip, single-use towels, strip cups. Train everyone who milks on the new protocol.
2. Week 2: Start pre/post-dipping every milking. Strip-cup test every cow at the first milking each day.
3. Week 3: Get a CMT kit (California Mastitis Test, ₹500–₹1,500) and screen every cow at the quarter level. Identify subclinical cases.
4. Week 4: Start treating identified subclinical cases with intramammary antibiotic. Coordinate with vet on antibiotic choice.
5. Month 2: Implement dry cow therapy on every cow drying off. Start tracking which cows develop clinical mastitis (and which quarter).
6. Month 3: Send a milk sample from chronic cases to the lab for culture. Adjust antibiotic choice based on susceptibility patterns.
7. Month 4+: Monitor BMSCC monthly. Expect 30–50% reduction in 6 months, 50–70% reduction in 12 months.

Mastitis is one of the few dairy problems where the prevention math is overwhelmingly in your favour. The investments are small, the techniques are well-known, and the payback is in months rather than years. The biggest barrier is just getting started.

Further reading and sources

The content in this guide draws on the following authoritative sources. Where specific numbers are quoted (SCC thresholds, NMC plan, prevention impact, prevalence in India), they reflect the consensus from these organisations.

• National Mastitis Council (NMC) — the global authority on mastitis prevention and control. The 5-point plan, SCC thresholds, and treatment principles in this article all originate from NMC research and member publications. nmconline.org
• Indian Council of Agricultural Research (ICAR) — mastitis prevalence studies across Indian smallholder and commercial dairies, BMSCC data from milk co-operatives, and economic-cost estimates. icar.org.in
• National Dairy Development Board (NDDB) — the recommended mineral mixture composition and milk co-op BMSCC pricing tier data referenced in the SCC section.
• Merck Veterinary Manual — mastitis disease descriptions, pathogen-specific treatment protocols, dry cow therapy protocols, and clinical signs. merckvetmanual.com
• FAO (Food and Agriculture Organization) — global dairy disease prevalence and prevention guidance, plus drug-residue and food-safety standards.
• Indian Veterinary Research Institute (IVRI) — pathogen-specific antibiotic susceptibility patterns for Indian dairy herds, used to inform the treatment options discussion.

For decisions on individual animals — antibiotic selection, withdrawal periods, severe-case management — always work with a qualified veterinarian who can match treatment to local pathogen patterns and animal-specific history. This article is general educational content; it is not a substitute for veterinary diagnosis. See our disclaimer for the full editorial position on veterinary content.

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