Why a Bull Fails Quietly
A bull can look solid in listing photos and still leave half your cows open. Sub-fertility often shows no limp, no thin ribs, and no obvious injury. The cost shows up six months later when the calf crop is short.
On Occuin, ask for the breeding soundness exam (BSE) before you travel or bid. A recent BSE from a veterinarian is the single best filter. Visual checks still matter because structure and health change between the exam and sale day.
Demand a Current BSE
A proper BSE covers four areas:
- Physical exam of eyes, feet, legs, and overall condition
- Scrotal circumference measurement
- Sperm motility (minimum 30% progressive)
- Sperm morphology (minimum 70% normal)
Bulls that pass are classified as satisfactory potential breeders. Results older than 60 days lose value. Ask the seller for the certificate and note the date, veterinarian, and any deferred findings. If the seller cannot produce it, treat the listing as higher risk.
Minimum scrotal circumference rises with age:
| Age (months) | Minimum SC (cm) |
|---|---|
| Under 15 | 30 |
| 15–18 | 31 |
| 18–21 | 32 |
| 21–23 | 33 |
| 24+ | 34 |
Larger is generally better within breed norms. Uneven testicles, hard lumps, or a soft feel are red flags even if the number looks acceptable.
Structural Checks You Can Do
Walk the bull on firm, uneven ground if possible. Watch for short strides, uneven weight-bearing, or a reluctance to turn. Straight or extremely angled hocks and knees wear out faster under breeding work.
Feet matter as much as fertility. Check heel depth, toe length, and claw shape. Overgrown or cracked claws lead to early culling. Lift a foot if the seller allows it and the animal is restrained safely.
Sheath and prepuce should sit high enough to avoid injury on rough ground or when mounting. A low, pendulous sheath is more likely to catch on brush or develop prolapse. Look for swelling, scarring, or discharge.
Body condition should sit near 5–6 on a 9-point scale. Too thin and he lacks reserves for a breeding season. Too fat and feet, joints, and fertility often suffer.
Temperament and Health History
Observe the bull while he is loose. High-headed, constantly alert, or aggressive animals increase handling risk and can injure cows or handlers. Quiet, responsive bulls are easier to manage and usually safer in mixed groups.
Ask for vaccination records, especially vibriosis (campylobacter), clostridial, and any regional diseases. Confirm BVD-PI status if available. Quarantine any new bull for at least 14 days and retest if your herd health plan requires it.
Genetics and Practical Fit
EBVs or EPDs help match the bull to your cows, but they do not replace a soundness check. Low birth-weight and high calving-ease numbers matter if he will breed heifers. Growth and carcass numbers matter if you sell calves. Match the numbers to your actual market and your cows’ strengths and weaknesses.
A bull that passes the BSE and walks correctly still needs enough libido and serving capacity. Those traits are not always measured in a standard BSE. Watch him around cows if the seller allows it, or ask for observed serving records.
Buyer Checklist Before You Bid
- Current BSE certificate (within 60 days) with motility and morphology numbers
- Age-appropriate scrotal circumference and even, firm testicles
- Sound feet and legs on a natural walk
- Acceptable sheath position and no reproductive tract abnormalities
- Body condition 5–6 and clean health/vaccination history
- Temperament suitable for your handling system
- Genetics that fit your cow herd and market
A bull that fails any major point is usually more expensive in lost calves than in the purchase price you saved. Use the listing tools on Occuin to message the seller for documents before you travel. A short set of clear questions saves a wasted trip and protects the next calf crop.
