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Herd Health & Disease ManagementBovine Respiratory Disease in Dairy Calves
Bovine respiratory disease, or BRD, is a leading cause of illness in dairy calves. It is a complex of viruses and bacteria plus stress, so prevention is mostly about management.
Key points
- BRD comes from germs plus stress and poor air quality.
- Colostrum, clean housing and ventilation do most of the prevention.
- Check every calf every day for subtle early signs.
- Your vet decides on tests, vaccines and medicines.
- Keep records by age and pen to find patterns.
What BRD is
BRD is a group of respiratory problems, often called pneumonia, caused by viruses and bacteria working with stress and poor air quality. Calves that get it may recover with lasting lung damage, grow slower and milk less as cows.
Because it is multi-factor, no single product fixes it. Your vet can help you work out the weak points on your farm.
Some calves get sick without any clear cause, but a pattern of repeat cases almost always has an explanation in housing, handling or colostrum.
Risk factors
Common risk factors include poor colostrum intake, crowding, mixing ages, damp or drafty housing, poor ventilation, dust, weather swings, transport and weaning stress, and other illness such as scours.
Housing air quality is often the hidden driver. A barn that feels stuffy or smells strongly of ammonia is a warning.
Consider whether calves are mixed from different sources, since each group brings new germs and the risk goes up with every new arrival.
- Calves that did not get enough colostrum
- Crowded pens or mixed ages
- Wet bedding and poor ventilation
- Sudden weather changes
- Weaning, grouping and transport stress
Signs to watch
Watch for runny nose or eyes, cough, fast or labored breathing, drooping ears, a calf that is slow to drink or stands apart, and fever. Signs can be subtle at first, so check every calf at each feeding.
Early detection matters. The sooner your vet sees a calf, the better the odds of recovery. Do not wait for a calf to be clearly struggling to breathe.
A quick daily walk through the calf area before you feed gives a good first look at who is up, who is eating and who is lying with a hunched back.
Housing and ventilation
Calves need fresh air without cold drafts at calf level. Good bedding that stays dry, adequate space, and either good natural ventilation or properly designed systems are important. Ask your extension specialist or a ventilation consultant to review calf barns.
Clean and disinfect pens between calves. Where possible, use all-in, all-out management for groups so older calves do not pass germs to younger ones.
Colostrum, nutrition and vaccination
Strong early colostrum intake and good nutrition set the foundation for immunity. Keep feeding consistent and clean, and make sure calves have access to water.
Ask your vet whether and when to vaccinate calves or the dry cows, and read labels for age and pregnancy restrictions. Vaccines lower risk but do not replace good housing.
Keep the vaccination record, including dates and product names, with the calf record so your vet can read the full story if a calf becomes ill.
What your vet decides
Diagnosis, medicines and supportive care are for your vet. This guide does not give drug names or doses. Ask your vet about lab testing of sick calves, which can identify the organisms and guide the plan.
Follow your vet's treatment plan closely. Milk and meat withdrawal times on the label or set by the vet must be followed exactly.
Records and review
Keep a record of each sick calf: age, signs, date, what the vet said and the outcome. Review cases by age group and pen. If a pattern shows, such as many cases after grouping, adjust the management step that coincides.
Sources and further reading
- Dairy Calf and Heifer Association
- American Association of Bovine Practitioners
- University of Wisconsin-Madison Extension
- Penn State Extension
Organization homepages are linked so you can search them for current guidance on this topic.