Pinkeye in Beef Cattle: Prevention and Control

Pinkeye is painful, spreads through a herd quickly, and can leave animals blind in one or both eyes. Catching it early and cutting down the triggers is the best plan.

Key points

Pinkeye spreads by flies, dust, and eye irritation.
Check calves often in fly season.
Shade and a separate pen ease affected cattle.
Fly control and pasture management are the base of prevention.
Call your vet for cloudy or ulcerated eyes.

What pinkeye is

Infectious bovine keratoconjunctivitis, called pinkeye, is an infection of the surface of the eye. It starts with irritation and tearing and can progress to cloudiness, ulcers, and loss of sight if not handled. Bacteria are the main cause, but they need a way in.

Anything that scratches or irritates the eye gives them that opening, which is why pinkeye tends to appear in groups of calves in summer and fall.

Even calves that recover can be left with scarring. Early attention is the best way to reduce the chance of lasting damage.

What makes it spread

Flies are the main carriers and irritants. Tall, seedy forage, dust, bright sunlight, and tight crowding add to the problem. Cattle with light pigment around the eyes may be more prone.

Because the germs pass from eye to eye by flies and contact, one case can quickly become many.

Sick animals shed bacteria in tears, and flies feeding on that moisture spread it. That is why dealing with the affected animals quickly and controlling flies go hand in hand.

Face flies and other biting flies
Tall, stemmy, or seedy pasture
Dust and wind
Strong sun, especially on light-faced cattle
Crowding at feeders and shade
Introducing carrier animals

Early signs

Look for squinting, excess tearing, wet streaks down the face, and eyes held partly closed. Later signs include a cloudy or white spot on the eye and red, swollen tissue. Affected cattle often hold their heads low and avoid sunlight.

Check calves often in fly season. Catching pinkeye early gives your vet more choices and gives the animal a better chance of keeping sight.

Compare both eyes. One eye that is wetter, smaller, or more closed than the other is usually the first clue, and you may see it before the animal looks sick.

Prevention ideas

Fly control is the first line of defense, and our guide on fly control on beef ranches covers it in more detail. Mowing pastures before seed heads form, providing shade, and keeping dust down can reduce irritation.

Talk with your vet about vaccination and about which options suit your herd. Results with pinkeye vaccines vary, and they should be part of a bigger program rather than the only step.

Handling affected animals

Separate cattle with sore eyes into a shaded pen, since sun makes the pain worse. Handle them gently and wash your hands afterward. Call your vet for any eye that is cloudy, ulcerated, or not improving.

Treatment decisions, including products and any procedures on the eye, belong with your veterinarian. Follow label directions and withdrawal times exactly after any vet-directed treatment.

Keep an eye on feed and water for animals with sore eyes, since they may not find the bunk easily. Moving them to a pen with easy access helps them keep eating while they recover.

Records and what to ask

Record the animal ID, date, which eye, and outcome. Over time you may see a pattern in a pasture or a group of cattle, which points to a cause you can fix.

Ask your vet which prevention steps are best for your region, how to handle animals with chronic eye damage, and whether a sample for culture would help in an outbreak.

Which prevention steps fit our fly season?
Is vaccination worth trying in our herd?
How do we handle cattle that lose sight?
Should we test during an outbreak?

Common mistakes

Waiting to see if it clears, leaving sore-eyed cattle in bright sun, ignoring flies, and treating without vet input are the usual errors. Another is overlooking sight loss when moving or working cattle, since blind animals can panic and hurt themselves or people. Give them quiet handling and plenty of space.

Do not use leftover products or home remedies on eyes without vet advice, since the wrong thing on a damaged eye can make it worse.

When to get help: Call your veterinarian when an eye is cloudy, has a visible ulcer, or does not improve quickly, since delay can cost the animal its sight. Treatments must follow the vet's direction, with label or vet-set withdrawal times respected for meat.

Sources and further reading

Organization homepages are linked so you can search them for current guidance on this topic.

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