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Herd Health & Cattle Care

Bull Health and Breeding Soundness

A bull provides half the genetics for every calf in the herd, and one unsound bull can mean a long season of open cows. A veterinary breeding soundness exam is the best insurance available.

Key points

  • Have every bull examined by a veterinarian before breeding season.
  • Feet, legs and body condition matter as much as semen quality.
  • Ask your vet about vaccines and tests that fit your herd.
  • Bulls are dangerous: plan for safe pens and never work alone.

What a breeding soundness exam is

A breeding soundness exam is a veterinary check of whether a bull is physically able to breed cows. In general terms, your vet looks at the bull's overall health, feet and legs, eyes, body condition and reproductive organs, and evaluates a semen sample under the microscope.

A bull that passes is not guaranteed to get every cow bred, and the exam does not measure libido or mating behavior in full. It is a useful screen that catches many problems before the breeding season, not after.

Ask your vet to explain what the exam found in plain words and to put the result in writing. A written result is useful if you buy, sell or lease a bull, and it gives you something to compare next year.

When to schedule the exam

Plan the exam well before turnout so there is time to replace or rest a bull that fails. Ask your vet when to book, since schedules fill up in spring and fall. Young bulls and older bulls, new purchases and bulls coming off an injury all deserve a check.

Exam results are a snapshot of that day. A bull that was sick, injured or very hot in the weeks before can change. Ask your veterinarian when a bull should be re-tested.

Feet, legs and structure

A bull has to walk, mount and cover ground for weeks. Poor feet, weak hocks, bad pasterns or old injuries limit that work. Watch bulls move on level ground before the season and note any stiffness or limping.

Hoof trimming should be done by someone with training. Lame bulls should be seen by a vet, because pain affects breeding as well as welfare.

A bull that has gone lame during the season should be pulled and looked at, not left to work through it. Pain changes how he mounts and how far he travels, and the damage can get worse.

Body condition and nutrition

A bull that is too thin will tire and lose weight during the season, while one that is too fat can have trouble breeding and moving. Aim for good, even condition on the 1-to-9 scale, and ask your nutritionist or extension specialist for the target that fits your breed and age.

Young bulls are still growing and need feed that supports growth and breeding at the same time. Do not make sudden changes to the ration without advice.

Keep fresh water and good forage in front of bulls all season, and think about how you will feed them after breeding ends, since many bulls come out of the season thin and need time to recover.

Health program and biosecurity

Work with your vet on a vaccination and parasite plan for bulls and new arrivals. Some diseases can be carried by bulls and spread to cows, so ask your vet which tests make sense for your herd, especially when buying a bull or sharing one with a neighbor.

Brucellosis and similar reportable diseases are regulated. If you see abortions or unusual illness in the herd, call your veterinarian, the state veterinarian or USDA APHIS right away, and do not handle suspect material yourself.

Safety around bulls

Bulls are strong and unpredictable, even the gentle ones. Never turn your back on a bull, never work one alone and always have a way out. Use solid pens, a good headgate and clear lanes.

Follow extension, NIOSH and OSHA guidance on livestock handling. Keep children away from bull pens. Many serious farm injuries involve bulls.

Common mistakes and what to ask your vet

Common mistakes include skipping the exam on a bull that worked last year, testing too close to turnout, ignoring a limp and putting too many cows with a young bull. Another is failing to check bulls partway through the season.

Ask your vet when to schedule the exam, what the results mean, how many cows a bull can cover, and how to handle a bull that fails.

When to get help: Book the breeding soundness exam with your veterinarian well before turnout, and ask how many cows each bull can handle. Call the state veterinarian or USDA APHIS for abortions or unusual illness.

Sources and further reading

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

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