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Breast edema
Udder edema is a buildup of fluid in and in front of the udder tissues around the time of calving. It is not an infection: the milk remains normal and the cow does not have a fever. The udder appears swollen, tense, heavy, with smooth, past...
What is it?
Udder edema is a buildup of fluid in and in front of the udder tissues around the time of calving. It is not an infection: the milk remains normal and the cow does not have a fever.
The udder appears swollen, tense, heavy, with smooth, pasty skin; a finger pressure leaves an imprint which takes several seconds to erase. It is this “bucket” that distinguishes edema from an infected udder.
Moderate engorgement in the days before and after calving is common and resolves on its own. It is the significant, painful and persistent edema that poses a problem: it hinders milking, injures the udder and opens the way to mastitis.
Commonly observed signs
These signs are neither exhaustive nor specific. Only a veterinarian can establish a diagnosis.
Related signs — each one links to its page:
Swollen, tense, shiny udder, often cold, with skin that retains the imprint of a finger.
The swelling can extend towards the front of the udder and rise under the belly, sometimes up to the chest.
The teats become large, tense and difficult to grip; installing the sleeves is complicated.
Pain and discomfort: the cow moves with her hindquarters spread apart, lies down with difficulty, may kick during milking.
Milk leaking between milkings when the pressure is high.
Milk production lower than expected, the cow being poorly milked.
Absence of fever, absence of local heat and normal-looking milk: these are the three points which point towards edema and not towards mastitis.
In severe forms, the skin may crack or become injured.
When to consult without delay
This list does not replace veterinary advice. It gathers situations that justify a prompt consultation.
Causes and risk factors
The fluid accumulates because the return of blood and lymph is difficult in a udder that is brutally stressed as calving approaches.
The pressure of the gravid uterus and the initiation of milk production increase fluid exchange in the area.
Diet plays an established role: an excess of salt and potassium in the late-gestation ration promotes fluid retention.
A ration that is too rich in energy before calving and an excessive body condition aggravate the situation.
Lack of exercise, in animals that remain immobile for a long time, further slows drainage.
An individual and family component exists: certain lines and certain udder conformations are more prone to it.
First lactation heifers: these are the most affected.
Cows with high production potential.
End of gestation ration too rich in salt, potassium or energy.
Animals overweight at calving.
Lack of exercise during the dry period, cramped accommodation.
History of edema during a previous lactation.
Large udder or poorly supported by its attachments.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
The veterinarian's first job is to differentiate it from mastitis, which is treated quite differently: he takes the temperature, feels the udder looking for localized heat and pain, and examines the milk.
The impression left by the finger, the coldness of the swelling, the absence of fever and normal milk suggest edema.
The veterinarian assesses the extent of the swelling, its extension under the belly, and looks for injuries to the skin or udder attachments.
He checks that a field test on the milk does not reveal associated mastitis, a common situation because the edema weakens the udder.
Finally, he analyzes the end-of-gestation ration, often the cause of the problem when it affects several animals.
Treatment
Many moderate edemas resolve on their own within one to two weeks after calving, without treatment, with regular milking.
Frequent and complete milkings are the first lever: they decompress the udder and restart circulation.
Gentle massages of the udder, from bottom to top, and a little daily exercise help with drainage. Massage without brutality: an edematous udder is easily injured.
In severe and painful forms, the veterinarian can prescribe medications to promote the elimination of fluid or fight against inflammation. These products are never used on your own initiative: if used incorrectly, they unbalance the cow at the worst time of her lactation.
Take care of the skin: keep it clean and dry, treat any cracks and watch for sores.
Breast support may be offered in certain very severe cases.
If medication is administered, respect the milk and meat withdrawal period set by the veterinarian.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
Adjust the end-of-gestation ration with your veterinarian or your advisor: limit salt and potassium, avoid excess energy.
Avoid heifers and cows that are too fat at calving.
Ensure a minimum of daily exercise during the dry period: an exercise area or a regular outing clearly improves drainage.
Get the heifers used to being approached and handled before calving: milking will be easier and more complete.
Monitor the udder of heifers in the days before calving.
Ensure clean, comfortable accommodation with room to sleep.
Note the cases: several marked edemas in the same batch almost always indicate a ration problem.
Possible complications
Mastitis: tight and injured skin, difficult-to-milk teats and incomplete milking encourage the entry of bacteria.
Wounds, cracks and sores of the skin of the udder.
Tearing of the udder attachments, which then remains permanently hanging, with teats closer to the ground and an increased risk of infection for all subsequent lactations.
Long-term lower milk production when the udder has been very stressed at the start of lactation.
Pain and refusal of milking, with a risk of accident for the milker.
When to see a veterinarian
The udder is very swollen, tense, and the swelling rises under the belly.
The swelling does not decrease after one to two weeks after calving.
The cow is visibly in pain, refuses milking or has difficulty lying down.
The skin of the udder cracks, becomes injured or oozes.
You notice fever, localized heat or abnormal milk: it is then no longer a simple edema and you should consult without delay.
Several animals from the same batch present the problem: have the end-of-gestation ration reviewed.
Prognosis
The vast majority of edemas resolve on their own within two weeks following calving and have no consequences.
Severe forms take longer to disappear and can cost milk at the start of lactation.
A cow that has had significant edema is more likely to experience it again during subsequent calvings.
The prognosis deteriorates especially when mastitis or tearing of the udder attachments is added: these consequences can be permanent.
Frequently asked questions
How to distinguish edema from mastitis?
Three simple benchmarks: in edema, the cow does not have a fever, the udder is cold and not hot, and the milk is normal. By pressing with your finger, you leave an imprint which remains for a few seconds. If you have the slightest doubt, or if the milk changes appearance, call the veterinarian.
Should a heifer be milked before calving if its udder is very swollen?
No, unless expressly indicated by the veterinarian. Milking before calving deprives the calf of colostrum, essential for its protection, and can worsen the situation. Ask for advice rather than deciding alone.
Does massage really serve any purpose?
Yes, as long as it is gentle and regular, from bottom to top, combined with a little exercise and thorough milking. A rough massage on a tense udder causes injury and makes things worse.
Will this happen again at the next calving?
It is possible, especially in predisposed cows. Adjusting the late gestation diet, particularly salt and potassium, and allowing some exercise clearly reduce the risk.
References
Content reviewed by the TunisieVet editorial team · Updated 09 August 2026
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