Fecal Worm Egg Count for Cattle and Buffalo: When and Why

A fecal worm egg count checks fresh dung under the microscope, counts the worm eggs, and can help show whether a cow or buffalo has a worm problem. Your vet can use the count to decide whether worm medicine is needed, and the result is only useful if the dung is fresh and kept cool.

What the test does

Many worms that live in an animal's gut lay eggs, and the eggs pass out in the dung. The usual method mixes a small amount of dung with a special liquid in which the eggs float, so that they are easy to see. The eggs are then counted under a microscope. Counts are commonly reported as eggs per gram of dung.

Different worms leave different eggs, so the eggs can often be told apart under the microscope. A few eggs are common in grazing animals. A high count may indicate a heavy worm load.

Liver flukes are flat, leaf-shaped worms that live in the liver. They may need a special method to find their eggs. Liver flukes need water snails to complete their life cycle, so animals that graze near ponds or wet fields are at greater risk. If your vet suspects flukes, say so when you book.

Signs that may point to worms

• slow growth or weight loss, even with good feed
• a rough, dull coat
• a pot belly in calves
• loose motions that keep coming back
• pale gums and eyelids, which may point to anaemia (too few red blood cells)
• less milk, or poor breeding

These signs are not specific. Many other illnesses cause them, which is why a test is useful. Young calves and growing animals are usually affected more than healthy adults, who build up some resistance. Young calves, especially buffalo calves, can pick up roundworms early in life.

When a test makes sense

• when an animal or calf shows the signs above
• before your vet decides on worm medicine
• during and after the rainy season, when damp ground helps worm larvae to survive
• for a herd, when your vet suggests testing several animals, such as calves, young stock and adults

Giving worm medicine to every animal without checking is not always needed, and worms can become resistant if medicine is overused. A count helps your vet decide which animals need it. Your vet may repeat the count later to see how things are going.

How to collect and send the sample

• Use fresh dung, taken straight from the animal or from the ground right after it is passed. Take it from the top of the pile, away from soil.
• A few spoonfuls are usually enough. Ask the lab how much is needed when you book.
• Put it in a clean, dry container with a tight lid. If you use a plastic bag, squeeze out the air and close it tightly.
• Label it with the animal's name or tag number, age, and the date and time.
• Keep it cool, out of the sun, and do not freeze it. Bring it to the lab the same day if you can.
• Use one container for each animal. Do not mix dung from different animals unless your vet asks you to.
• Tell your vet and the lab the date of the last worm medicine.
• Wear gloves and wash your hands afterwards.

In Bhopal, sample collection at your door is free. From other districts, read Sending Samples to a Bhopal Vet Lab from Other MP Districts.

What the result can and cannot tell

If eggs are seen, it may indicate a worm infection. If no eggs are seen, worms are not ruled out. Young worms do not lay eggs yet, and some worms lay eggs only now and then.

The number of eggs is not the exact number of worms. Adult animals with some resistance often have low counts. Your vet reads the count together with the animal's age, signs, feed and grazing.

Your vet may repeat the test or add other tests:

• The Fecal Worm Egg Count for Cattle & Buffalo is the main test for worm eggs in dung.
• The Stool Routine looks at the dung more widely, for example when an animal has diarrhoea.
• The Complete Blood Count (CBC) can help show anaemia.
• The Dairy Cattle Health Check includes the worm egg count with other routine farm tests.

Reporting is normally the same day or within 24 hours for routine tests.

When to talk to your vet

Talk to your vet if an animal has:

• diarrhoea with blood, or diarrhoea that lasts for days
• a thin, weak and pale look
• a pot belly (in a calf)
• swelling under the jaw

Ask your vet before you start any worm medicine. The right choice depends on the type of worm and the animal.

Test results are not a diagnosis on their own. A registered veterinarian reads them together with the animal's signs and history, and decides on treatment or further tests.