Bovine Respiratory Disease in Ranch Calves

Bovine respiratory disease, often called BRD or shipping fever, is one of the biggest health challenges for beef calves. Prevention and early detection do more than any single treatment.

Key points

BRD is a complex of viruses, bacteria, and stress, not a single disease.
Weaning, shipping, and commingling raise the risk the most.
Daily observation after stress events catches calves early.
Treatment should follow a vet-led plan with strict withdrawal times.
Records show which groups and practices need to change.

What BRD is

BRD is a complex of lung and airway disease, not one single illness. It develops when viruses, bacteria, and stress combine to overwhelm a calf's defenses. Some of the germs involved live in the nose and throat of healthy cattle, which is why stress is so often the trigger.

Calves around weaning, shipping, and commingling are most at risk, but BRD can show up in younger calves and in older cattle too.

Because the cause is a mix of agents and conditions, a single fix rarely solves the problem. Ranches that keep BRD in check usually work on several things at once: nutrition, vaccination timing, handling, facilities, and where calves come from.

Common risk factors

Think about what lowers a calf's resistance. Weaning, transport, crowding, dust, temperature swings, poor nutrition, and mixing calves from many sources all play a part. A calf that has not had colostrum, or has a heavy parasite load, starts at a disadvantage.

Look at your own operation and find where stress piles up. Then change one thing at a time.

Calves bought from sale barns carry more risk than calves raised at home, because their history is unknown and they have already been through stress. If you background purchased calves, plan for extra observation and talk to your vet about receiving protocols.

Weaning and shipping at the same time
Mixing calves from different ranches
Dusty, crowded pens
Sudden weather changes
Rough handling or long waits at the chute
Poor early nutrition or missed colostrum

Early signs to watch for

Early BRD is easy to miss. Look for calves that are slow to come to feed, hang their heads, droop their ears, cough, have a runny nose, or breathe faster than the others. Fever is common, but you will not see it without catching and checking the animal.

Walk through calves every day after stress events and look at them standing, not only when they are being fed. Pull calves that look off and examine them closely, and write down who they are.

Train everyone on the crew to look for the same things. A simple shared checklist at the feed bunk helps a hired hand and an owner reach the same conclusion about a calf.

Prevention starts before weaning

The best prevention is a calf that arrives at weaning healthy, well fed, and familiar with feed and water. Work with your vet on a vaccination plan, and ask about timing relative to weaning. Calves that have been vaccinated, bunk broke, and weaned with minimal stress tend to fare better than those hit with everything at once.

Low-stress handling matters. Quiet pens, patient crews, and well-designed facilities cut the stress that opens the door for disease.

Facilities count too. Good ventilation without drafts, dry footing, and enough bunk space per calf cut stress and help keep airborne germs from building up in a pen.

Treatment belongs with your vet

Treatment of BRD should follow a plan developed with your veterinarian. Antibiotics are tools that need careful stewardship, with label directions followed, correct records kept, and no guessing about product or timing. Meat withdrawal times must be followed exactly, and residue avoidance protects the beef supply.

Ask your vet to help you set simple, written criteria for when to pull and treat a calf, and what to do when a calf does not respond.

Records and review

Track each sick calf: ID, date, signs, vet-directed treatment, and outcome. Over time these records show which pens, groups, or sources have problems, and let you adjust vaccination, weaning, or purchasing.

Keep necropsy results if you lose calves. Ask your vet whether a post-mortem exam is worthwhile, since it can tell you what you are really dealing with.

At the end of each season, sit down with your vet and review your numbers. Ask what you would change about vaccination, weaning, or purchase sources before the next group comes through.

Common mistakes

Waiting too long to pull a calf, treating without vet guidance, ending a course early, and failing to record treatments are the most common mistakes. Another is blaming a product when stress and handling are really the driver. Review how calves are weaned and moved before changing anything else.

When to get help: Call your veterinarian when a calf coughs, breathes fast, or goes off feed, and ask for a written health plan before weaning. Follow label directions and withdrawal times on anything given to cattle.

Sources and further reading

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

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