Mastitis Prevention and Treatment Guide

Prevention rests on four habits and almost none of them involves a drug: milking order, one clean towel per cow, clean teats, and testing the cows that look perfectly well. Treatment is the harder half, because the cheap antibiotics have largely stopped working in Uganda. This mastitis prevention and treatment guide starts where the Ugandan evidence starts, with how much of the disease nobody can see.

How Much Mastitis Is in the Ugandan Dairy Herd

More than most farmers would believe. A pooled analysis of Ugandan studies put subclinical mastitis prevalence at 75.71 percent, with a 95 percent confidence interval running from 55.10 to 88.78 percent. That interval is wide because the underlying studies varied a great deal, and the individual studies bracket it from both sides.

Set those against the region and the picture gets worse rather than better. An Africa wide analysis of 82 studies across 11 countries put pooled subclinical mastitis at 48.2 percent, and found East Africa the highest region at 67.7 percent. Uganda sits above even that. The Kampala study's authors concluded plainly that prevalence in Uganda is higher than earlier work had reported and higher than in comparable countries.

Prevalence at that level changes what the disease is. At five or ten percent, mastitis is a problem with particular cows. At seventy five percent it is a property of the herd, and treating cases one by one is bailing rather than plumbing.

Subclinical Mastitis Is Most of the Disease and Shows No Signs

In the Jinja study, subclinical cases made up more than 95 percent of the mastitis present and clinical cases under 5 percent. No clots, no heat, no swelling, no off colour milk. The udder looks normal and the milk looks normal.

Which is why the same study's most quietly devastating finding is a knowledge one. Of 60 farmers interviewed, 50 knew about clinical mastitis and not one knew that subclinical mastitis existed. Seventy eight percent said they checked for mastitis, and when asked how, a third named clinical signs and roughly another third named a drop in milk. Both of those detect the five percent and miss the ninety five.

Farmers were not unaware that mastitis costs them; almost all of them were. Asked to say where the loss falls, they put it in this order.

Read the first and second lines together and the case for testing makes itself. Three times as much money is lost in the milk that quietly does not arrive as in the vials that do.

Which Cows Are at Risk: Breed, Age, Parity and Stage of Lactation

The Africa wide analysis tested which cow factors actually move prevalence, and the answers are useful because two of them are not what farmers are told.

Breed matters and the direction is uncomfortable. Pooled prevalence was 59.3 percent in exotic cows, 50.2 percent in crossbreds and 33.5 percent in local breeds. The Jinja figures point the same way from a smaller sample: 65.4 percent of 124 exotic cows tested positive against roughly a quarter of the 34 crossbreds, and none of the six indigenous animals. Exotic udders are larger and the structure of the teat canal is less resistant to infection.

Age matters, steeply. Prevalence ran 33.9 percent in cows aged two to five, 51.4 percent at six to nine, and 67.6 percent above nine. Older teat sphincters seal less well and older udders hang lower, so exposure rises with every lactation.

Parity matters. Cows on their seventh calf or later ran 63.9 percent, higher than cows in their first three. Infections accumulate rather than resolve.

Stage of lactation matters, and late is worse than early. Jinja recorded 47.8 percent in the first three months, 53.3 percent at three to six months and 71.7 percent beyond six months. Chronic infections picked up early and never cleared are still there in month eight.

Now the two that farmers are commonly told and that the pooled data did not support. Milk yield showed no statistically reliable effect on prevalence, and neither did production system, meaning extensive against semi intensive against intensive. The high yielding cow is not automatically the mastitis cow, and zero grazing is not automatically the cause. What zero grazing does is concentrate the hygiene problem into a small area where it is easier to get wrong, which is a management failure rather than a property of the system. That distinction matters because it is the difference between an unavoidable cost and a fixable one.

Detecting Subclinical Mastitis on a Farm With No Laboratory

Mastitis raises the number of somatic cells in milk long before anything is visible. The California Mastitis Test turns that into something a farmer can read at the kraal, and it needs a plastic paddle with four compartments, a bottle of reagent, and about a minute.

Two things this gives you that guesswork cannot. It tells you which quarter, which matters because treating a whole cow for one infected quarter wastes three quarters of the effort. And it tells you which cows to milk last, which is the single cheapest control measure on the farm and costs nothing but sequence.

Test routinely rather than after trouble. Monthly across the milking herd, plus every cow at calving and every cow at drying off, is a reasonable pattern to start from and a vet can tighten it for your herd.

Milking Order and One Clean Towel Per Cow in the Herd

Ugandan milking practice is where most of the transmission happens, and the studies are unusually specific about it. In Jinja, all 60 farms hand milked, 96.6 percent twice a day, and 66.7 percent followed no particular order of cows. One farmer told the researchers he starts with the difficult animals, including sick ones, then milks the normal cows afterwards without washing his hands between them. Many used the same towel on every cow.

In Kiruhura the same faults appeared on farms where 76.1 percent of cows had mastitis: one milking towel shared between animals, milkers not washing between cows, and no milking parlour at all.

The organisms that cause most Ugandan mastitis live on teat skin and in teat canals and travel from cow to cow at milking, on hands and on cloth. So the practices that stop them are sequence and separation, not medicine.

Milk the clean cows first and the ones your test paddle flagged last, every single milking. One clean cloth per cow, wrung out in warm water, and a fresh one for the next animal rather than the same one rinsed. Wash hands between cows, which most Ugandan milkers already do, at 98.3 percent in the Jinja sample. Dry the teats after washing, because a wet teat carries water and bacteria down into the cup or the hand. And where milking is done by employees, which it was on 52.5 percent of those farms, the order and the towels are a rule you have to set and check rather than assume.

Teat Dipping, and the Dung Smearing That Undoes It on Ugandan Farms

Dipping the teats in a disinfectant after milking closes the window while the teat canal is still open. It is named in every Ugandan study as one of the simple measures that would work, and in Jinja exactly one farmer out of 60 was doing it.

Which product and which strength is a label and vet question and no dilution appears here. What is worth saying is that the dip has to be fresh, the cup has to be clean, and a dip that has been used on twenty cows is carrying whatever the twentieth cow had.

There is one Ugandan practice that works directly against all of this, and it is worth naming because it is invisible to anyone not on the farm. A study in Kiruhura recorded farmers smearing cow dung on the teats of milking cows to stop weaner calves and heifers from suckling them in the field. It does stop the suckling. It also coats the teat of a lactating cow in faecal bacteria, and coliform organisms in milk are read by researchers precisely as an indicator of faecal contamination. Where calves have to be kept off, keep them off by separating the animals, and the calf feeding guide covers how weaning should be managed.

Dry Cow Therapy at Drying Off, and Who Decides

Drying off is the one moment when a chronic infection can be cleared without any milk being thrown away, because there is no milk. The regional East Africa dairy feeding manual's instruction is to infuse all four quarters with a long acting preparation once milking stops, and in Jinja one farmer out of 60 was doing any form of dry cow therapy.

This page will not tell you to infuse every cow, and the reason is the resistance evidence in the next two sections. Treating every cow in the herd at every drying off uses a great deal of antibiotic on cows that do not need it, and Ugandan mastitis organisms are already resistant to the affordable drugs. The alternative is to treat the cows your test records say are infected, which means the paddle has to have been used during the lactation for the decision to be possible at all.

Either way the decision is a vet's, working from your records and knowing what the local organisms are doing, and the product and the interval come off the label. What a farmer controls is having the records that make a selective decision possible, and treating the drying off day as a control opportunity rather than an administrative one.

While you are at it, the same manual's drying off advice includes cutting concentrate and milking intermittently for a high yielder. It also suggests temporarily withdrawing water, which contradicts its own statement that cows suffer from restricted water faster than from any dietary shortage, and that part is not repeated here. Ask a vet.

Which Organisms Cause Mastitis on Ugandan Dairy Farms

Knowing which organism is involved changes the answer, which is why the list matters to a farmer rather than to a laboratory alone. In the Jinja study, 688 quarter samples were cultured.

Just over half the quarters, 357 of 688, grew something, and 59 of those carried more than one organism at once. The peri urban Kampala study found the same leader, coagulase negative staphylococci at 54.7 percent of samples, with streptococci at 16.2 percent. Kiruhura found staphylococci at 30.8 percent, Corynebacterium at 15.4 percent, streptococci at 12.3 percent and Escherichia coli at 7.7 percent. The Uganda pooled analysis put Staphylococcus aureus at 24 percent of all isolates.

Group them by where they come from, because that is what tells you what to change. Staphylococci and Streptococcus agalactiae live on teat skin and in teat canals and are passed between cows during milking, so they are a milking hygiene and milking order problem. Coliforms, including E. coli, come from mud, wet bedding and dung, so they are a housing and floor problem. A herd whose samples are mostly staphylococci has a milking routine to fix. A herd full of coliforms has a pen to fix.

Antibiotic Resistance in Ugandan Mastitis Isolates

This is the part that makes the prevention sections above urgent rather than merely sensible. Ninety one staphylococci from the Jinja quarter samples were tested against a panel of antibiotics.

The two the herd is most likely to be treated with, penicillin and tetracycline, are the two with the least chance of working, and the one that almost always worked, gentamicin, was the most expensive drug available to those farmers. The study's authors draw the direct line: high treatment costs are partly a resistance problem, because the cheap option has stopped being an option.

The Uganda pooled analysis reached the same conclusion across five studies, with over half of isolates resistant to penicillin and tetracycline. And the organism decides: in the peri urban Kampala study every one of the 34 streptococci tested was still sensitive to penicillin, while 58.9 percent of the staphylococci tested produced the enzyme that destroys it. Two cows on the same farm, same visible problem, opposite correct treatments. That is an argument for a culture rather than for a habit.

No product name, dose or course length appears on this page. Those come from a vet who knows the local resistance picture and from the label, and Ugandan antibiotics being available over the counter without a prescription is part of how the resistance got here.

Why Splitting One Tube Across Four Quarters Costs the Whole Herd

Two Ugandan practices do more to breed resistance than anything else recorded, and both are rational attempts to save money.

The first is dividing a single intramammary tube between all four quarters instead of using one per quarter. Farmers in Jinja reported doing exactly that to cut the cost of a treatment. The arithmetic is obvious and the consequence is the opposite of intended: every quarter gets a quarter of the intended exposure, which is enough to kill the weakest organisms and leave the rest to multiply with the competition removed. One tube split four ways is not a cheap treatment, it is a resistance training programme.

The second is stopping a course early, once the milk looks normal again. Same mechanism, same outcome.

A study of 417 smallholder dairy farmers in Wakiso, Kampala and Mukono found something that reframes how this gets fixed. Farmers who knew about resistance, knew about withdrawal periods and held sensible views about antibiotics were not reliably the farmers who behaved that way. The authors call it a knowledge to action gap, and it tracked with access rather than with awareness: farmers reporting more difficulty getting veterinary services had lower odds of following correct dosage and of observing withdrawal. Telling farmers more is not the fix. Getting a professional to the farm is.

One thing in that study did move behaviour and it is worth acting on personally. Farmers who had been told by an animal health professional about withdrawal periods were far more likely to observe them, at roughly three and a half times the odds. So ask. If nobody has told you the withdrawal period for what is in your cow, that is the question to put to whoever sold it or administered it.

Milk Withdrawal After Treatment, and Why It Is a Cost Line

After any antibiotic treatment, milk from that cow has to be withheld for a period before it can be sold or drunk. The period depends on the product and appears on the label. No number is given here, and nobody should take one from an article. The vet or the label sets it, and the clock starts at the last dose rather than when the udder looks better.

Ugandan sampling shows how often this is being got wrong. A study in the cattle corridor districts of Nakaseke and Nakasongola tested marketed raw milk and beef for six tetracycline compounds using high performance liquid chromatography and liquid chromatography with tandem mass spectrometry. It found tetracycline residues in 5.3 to 42.1 percent of milk samples depending on district, and in 7.7 to 69.2 percent of beef samples, with oxytetracycline the compound most often detected. Between 5.3 and 69.2 percent of samples exceeded the European Union's maximum residue limits. The authors' recommendations are stewardship, enforcement of withdrawal periods, and routine national residue monitoring, which together say that none of the three is currently in place.

For a farmer this is a cost line and a reputation line at once. The withheld milk is real income foregone, and it showed up in the Jinja loss shares under reduced income at 13.4 percent. Selling it anyway transfers the cost to a buyer who cannot detect it, and Uganda's formal processors test rarely enough that most of it gets through. That is the whole problem in one sentence: the incentive runs the wrong way, and the only thing holding the line is the farmer.

Two practical habits. Mark a treated cow physically so that whoever milks her at four in the morning knows, because the person who treated her is often not the person who milks her. And keep her milk out of the can rather than in a separate bucket that gets tipped in later by someone who did not know.

What to Do With a Chronic Cow in the Herd

Some cows do not clear. In Jinja, animals with chronic mastitis were sold off in 16.7 percent of cases, slaughtered in 40 percent and treated further on veterinary advice in 43.3 percent.

Those three numbers describe a decision most farms make too late. A chronically infected cow is a reservoir: she reinfects the herd at every milking, she carries a deformed udder toward the end, and she absorbs treatment money that is not working. The question is not whether to treat her again but whether she is still worth the milk she gives net of what she costs the cows around her.

When the answer is that she is not, the two honest options are culling her for slaughter or selling her with her condition disclosed. Selling a chronic mastitis cow as a sound dairy animal moves the problem into someone else's herd, and it is also how a buyer learns not to trust local sellers.

Ugandan farmers told researchers what stops them acting sooner, and the list is worth quoting because it is not ignorance. High treatment costs came first, then insufficient or absent veterinary services, then the difficulty of diagnosing the disease at all, then low income, then hygiene that becomes impossible in the rainy season, then lack of equipment. Three of those six are access problems and one is a diagnosis problem that a paddle and a reagent bottle would solve.

Housing, Bedding and Wet Season Hygiene on Ugandan Dairy Farms

Coliform mastitis comes from the ground the cow lies on, so this section is about the floor. In the Jinja sample, 90 percent of farms provided some shelter, two thirds had concrete floors and a third earth. Forty one of the 60 farms provided no bedding at all. Nearly half cleaned the house with a spade only, with no water involved.

Seventy two percent of those farms were zero grazing, cutting and carrying elephant grass. That confinement is not itself the cause of mastitis, as the pooled African data found no reliable effect of production system, and it does mean the cow spends her day on a surface you control entirely. A surface you control entirely is either an advantage or an accusation.

The practical list is short. Bedding of some kind, kept dry and changed rather than topped up. A floor that drains, because a cow lying in a wet patch is pressing a dirty teat end against it for hours. Cleaning with water, not a spade alone, in the place where the cow lies rather than only where she is milked. Teats visibly dirty at milking are a warning worth acting on: Jinja recorded 88.9 percent of the cows whose teats were very dirty testing positive, against 60.9 percent of those with clean teats, and the group of very dirty cows was small enough that the exact figure should be treated as a signal rather than a measurement.

And the rainy season is the hard part, which farmers named themselves. Plan for it before it arrives, because a plan made in March about where the cows will lie in April is worth more than any product. Pen layout and drainage are covered on the dairy cow housing guide.

Questions Ugandan Dairy Farmers Ask About Mastitis

My cow's milk looks normal. Can she still have mastitis? Almost certainly, on the Ugandan numbers. Subclinical cases were more than 95 percent of the mastitis found in a Jinja study, and pooled Ugandan prevalence of subclinical mastitis is 75.71 percent. Normal looking milk from a normal looking udder is the commonest presentation there is. A California Mastitis Test paddle is the only way to see it on a farm.

How do I know which quarter to treat? Test each quarter separately with the paddle rather than treating the cow. A four compartment paddle gives you four separate answers in under a minute, and treating one infected quarter instead of four uses a quarter of the drug.

Which antibiotic should I use? That is a question for a vet and not for an article, and the Ugandan resistance data is why. Nearly 87 percent of staphylococci from one Ugandan study were resistant to penicillin and 77 percent to tetracycline, which are the two most likely to be reached for. In the same country, every streptococcus tested in another study was still sensitive to penicillin. The organism decides, so the culture decides, and no page can guess it for your cow.

How long must I throw the milk away after treating a cow? As long as the product label says, and a vet should confirm it for the specific preparation used. No article should give you a number. Take the question seriously: Ugandan sampling of marketed raw milk in two cattle corridor districts found tetracycline residues in 5.3 to 42.1 percent of samples, with a share of those above the European Union's residue limits.

Can I split one tube between the four quarters to save money? No, and this is the most expensive saving in Ugandan dairy. Each quarter then receives a fraction of the intended exposure, which kills the weakest organisms and leaves the strongest to multiply without competition. Farmers doing this were recorded in Uganda, and it is named in the same study as part of why resistance is where it is.

What does mastitis cost a Ugandan dairy farm? More in milk than in medicine. Farmers themselves put reduced milk production at 52.6 percent of the loss against treatment costs at 16.5 percent, with withheld and unsellable milk adding a further 13.4 percent. Treatment prices and paddle and reagent prices move by district and supplier, so check locally, and the herd level arithmetic is on the cost of dairy farming and dairy farming profit calculation pages.

Are my crossbred cows more likely to get mastitis than local cows? Yes, on pooled African evidence: 59.3 percent in exotic cows, 50.2 percent in crossbreds and 33.5 percent in local breeds. Larger udders and a less resistant teat canal are the stated reasons. It is one of the running costs of an upgraded herd, and a reason to build the milking routine before the cows arrive rather than after.

Does zero grazing cause mastitis? The pooled African data found no reliable difference between extensive, semi intensive and intensive systems, so the system itself is not the culprit. What confinement does is put the cow on a surface you control, so the bedding, the drainage and the cleaning become yours to get right. Get them right and confinement is neutral.

Should I dry cow treat every animal? A vet decides, from your own test records. Blanket treatment at drying off uses antibiotic on cows that do not need it in a country where the affordable drugs are already failing, and treating only the cows your paddle flagged is the alternative. Either way the decision needs records you can only have if you tested during the lactation.

California Mastitis Test paddles, reagent, teat dip and intramammary preparations vary in price and availability between districts and suppliers, and nothing here is a quote or a prescription. Before setting a herd routine, ask a veterinary officer which organisms and which resistances they are seeing locally, get the withdrawal period for anything you use in writing, and price the test kit against a month of the milk you are quietly losing. The supplier directory, the page on when to call a veterinarian and the cattle and dairy hub will point you on, and common cattle diseases in Uganda puts mastitis alongside the rest of the herd health picture.