Orchitis and Epididymitis in Rams: Testicular Swelling and Fertility Problems

Quick Answer
  • Orchitis is inflammation of the testicle, and epididymitis is inflammation of the epididymis, the structure that stores and transports sperm.
  • In rams, the most important infectious cause is Brucella ovis, but other bacteria and trauma can also cause testicular swelling and reduced fertility.
  • Common signs include one-sided or two-sided scrotal swelling, firm or lumpy epididymides, pain, reluctance to breed, and poor semen quality.
  • See your vet promptly if a breeding ram has scrotal enlargement, heat, pain, fever, or a sudden drop in flock pregnancy rates.
  • Diagnosis often includes a breeding soundness exam, careful palpation, semen evaluation, and blood testing for Brucella ovis.
  • Fertility can remain reduced even after swelling improves, so breeding decisions should be made with your vet.
Estimated cost: $150–$1,200

What Is Orchitis and Epididymitis in Rams?

Orchitis means inflammation of the testicle. Epididymitis means inflammation of the epididymis, the tightly coiled structure attached to the testicle where sperm mature and are stored. In rams, these problems often happen together, so a swollen scrotum may involve one or both structures.

This matters because even mild-looking disease can affect semen quality, sperm movement, and breeding performance. Some rams show obvious pain and enlargement. Others have only a firm, enlarged tail of the epididymis or a gradual decline in fertility that is first noticed when fewer ewes become pregnant.

A major concern in sheep is ovine epididymitis caused by Brucella ovis. This infection can be clinical or subclinical, spreads within flocks, and is well known for reducing ram fertility. Other infectious agents, trauma, and secondary bacterial infections can also damage the testicle or epididymis.

Because fertility may stay impaired after inflammation settles, early veterinary evaluation is important. Your vet can help determine whether the ram may recover, needs further testing, or should be removed from breeding.

Symptoms of Orchitis and Epididymitis in Rams

  • Scrotal swelling on one or both sides
  • Firm, enlarged, or irregular epididymis, especially at the tail
  • Pain when the scrotum is handled
  • Warmth or redness of the scrotal skin
  • Reluctance to breed or reduced libido
  • Poor semen quality, low motility, or abnormal sperm
  • Small, shrunken, or uneven testicles after earlier swelling
  • Fever, depression, or reduced appetite
  • Lower-than-expected conception rates in the flock

Some rams look obviously uncomfortable, while others keep eating and acting fairly normal even with important reproductive disease. A hard lump in the epididymis, uneven testicles, or a ram that suddenly breeds poorly can be the first clue.

See your vet immediately if the ram has severe pain, marked swelling, fever, lethargy, trouble walking, or if multiple breeding rams are affected. Fast evaluation also matters when Brucella ovis is possible, because flock spread and long-term fertility losses can follow.

What Causes Orchitis and Epididymitis in Rams?

The best-known infectious cause in rams is Brucella ovis, the bacterium responsible for ovine epididymitis. It is shed in semen and is associated with genital lesions, reduced fertility, and sometimes subclinical infection. Ewes can carry the organism in vaginal discharges for a limited time, but infected rams are the main source that keeps the problem moving through a flock.

Other bacteria can also inflame the epididymis or testicle. Depending on region and flock history, your vet may consider organisms such as Actinobacillus seminis, Histophilus somni, Trueperella pyogenes, and other opportunistic bacteria. Infection may ascend through the reproductive tract or follow local injury.

Noninfectious causes matter too. Trauma, fighting, heat injury, or scrotal wounds can trigger swelling and pain. Once tissue is damaged, secondary infection may follow. In some cases, the original swelling improves but leaves scar tissue that still lowers fertility.

Because several causes can look similar on physical exam, it is risky to assume every swollen testicle is the same problem. Your vet may recommend testing not only to guide flock decisions, but also to address possible reporting requirements if brucellosis is suspected in your state.

How Is Orchitis and Epididymitis in Rams Diagnosed?

Diagnosis starts with a hands-on reproductive exam. Your vet will assess body condition, scrotal symmetry, testicular tone, and the epididymides for enlargement, pain, firmness, or irregular nodules. In breeding rams, this is often part of a breeding soundness exam done before the season.

Semen testing is often important because fertility problems may be present even when swelling is subtle. A semen evaluation can look at motility, concentration, and sperm shape. Merck notes that a satisfactory ram breeding soundness exam includes semen with at least 30% progressive motility and 70% morphologically normal sperm, but a ram with active inflammation may fall well below those targets.

If Brucella ovis is a concern, your vet may recommend serology such as ELISA and may pair that with palpation findings. In some cases, semen or tissue testing, culture, or PCR may be used. Culture is considered the most definitive direct proof of infection, but it is not always the fastest or easiest field option.

Your vet may also discuss flock-level testing, isolation of suspect rams, and repeat testing if exposure was recent. That matters because some infected rams may not test positive immediately after infection, and a single normal-looking exam does not always rule out early disease.

Treatment Options for Orchitis and Epididymitis in Rams

Spectrum of Care means you have options. Here are treatment tiers at different price points.

Budget-Conscious Care

$150–$350
Best for: A noncritical ram with mild swelling, limited budget, or when the immediate goal is to reduce pain and prevent breeding use until your vet can reassess.
  • Farm call or clinic exam
  • Physical and scrotal palpation
  • Short-term isolation from breeding group
  • Pain control and anti-inflammatory treatment if appropriate
  • Rest from breeding and monitoring of swelling
  • Basic discussion of culling versus recheck
Expected outcome: Comfort may improve, but fertility prognosis is guarded unless the cause is mild and temporary. Breeding soundness often remains uncertain without semen or lab testing.
Consider: Lower upfront cost, but less certainty. This approach may miss infectious flock problems, especially if Brucella ovis is involved.
Most Common

Recommended Standard Treatment

$350–$800
Best for: Most breeding rams with testicular swelling, palpable epididymal changes, poor flock conception, or concern for infectious disease.
  • Complete veterinary reproductive exam
  • Breeding soundness exam
  • Semen collection and evaluation
  • Brucella ovis blood testing
  • Isolation and biosecurity guidance
  • Targeted medications or supportive care based on exam findings
  • Recheck exam and breeding recommendations
Expected outcome: Fair for identifying the cause and making sound breeding decisions. Fertility may recover in some nonsevere cases, but chronic or infectious cases often have a guarded long-term outlook.
Consider: Higher cost than basic care, but it gives much better information for treatment, culling decisions, and flock protection.

Advanced / Critical Care

$800–$1,200
Best for: High-value breeding rams, herd fertility outbreaks, suspected reportable disease situations, or cases where the pet parent wants the most complete diagnostic picture.
  • Everything in standard care
  • Repeat or flock-level Brucella ovis testing
  • Diagnostic lab submission for semen, culture, PCR, or tissue testing
  • Ultrasound if available through your vet or referral service
  • State veterinarian or regulatory coordination when indicated
  • Detailed flock control plan including segregation and culling strategy
Expected outcome: Best for clarifying flock risk and future breeding management. Individual fertility still may not return, especially with fibrosis, abscessation, or confirmed Brucella ovis infection.
Consider: Most complete information, but more handling, more testing, and a higher cost range. In many confirmed brucellosis cases, management decisions may still lead to culling rather than prolonged treatment.

Cost estimates as of 2026-03. Actual costs vary by location, clinic, and individual case.

Questions to Ask Your Vet About Orchitis and Epididymitis in Rams

Bring these questions to your vet appointment to get the most out of your visit.

  1. Does this feel more like orchitis, epididymitis, trauma, or a chronic scarred lesion?
  2. Should this ram be removed from breeding right away, and for how long?
  3. Do you recommend a breeding soundness exam and semen evaluation before making breeding decisions?
  4. Should we test for Brucella ovis, and do state reporting rules apply where we live?
  5. What biosecurity steps should we take with this ram, the ewes he bred, and the rest of the ram group?
  6. If swelling improves, what are the chances fertility will return enough for breeding?
  7. At what point is culling more practical than continued treatment or repeat testing?
  8. Should the rest of the breeding rams in the flock be palpated or tested before the next season?

How to Prevent Orchitis and Epididymitis in Rams

Prevention starts before breeding season. A pre-breeding breeding soundness exam helps identify rams with epididymal lumps, uneven testicles, poor semen quality, or other fertility problems before they are turned out. This is one of the most practical ways to reduce missed pregnancies and avoid using a ram that is already subfertile.

Biosecurity is also important. Test new or returning breeding rams according to your vet's advice and your state's requirements, especially for Brucella ovis. Avoid mixing untested rams into the breeding group, and isolate any ram with scrotal swelling, palpable epididymal changes, or poor breeding performance until your vet has evaluated him.

Good flock management lowers risk as well. Reduce fighting and traumatic injuries, maintain clean handling areas, and keep records on conception rates, abortions, and ram fertility history. If one ram is diagnosed with infectious epididymitis, your vet may recommend flock-level palpation, testing, and strategic culling to limit spread.

Because brucellosis organisms can pose human health concerns, use gloves and careful hygiene when handling reproductive tissues, semen, or discharges from suspect animals. Your vet can help you build a prevention plan that fits your flock size, breeding goals, and cost range.

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