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Reduced mating efficiency due to osteo-arthrosis in a ram
Journal of the South African Veterinary Association
|March 1, 1985
Summary
A ram with chronic osteoarthrosis exhibited unusual mounting behavior due to pain, severely impacting its mating efficiency and serving capacity despite good semen quality.
Area of Science:
- Veterinary Medicine
- Animal Reproduction
- Orthopedics
Background:
- Assessing ram fertility is crucial for sheep breeding programs.
- Normal reproductive function in rams depends on physical soundness and libido.
- Abnormal behaviors during mating can indicate underlying health issues.
Observation:
- A clinically normal ram with excellent semen quality and libido displayed abnormal mounting behavior.
- The ram exhibited a peculiar aerial lunge to mount ewes.
- Post-service, the ram lost all sexual interest in other ewes.
Findings:
- Radiographs revealed chronic osteoarthrosis of the right femero-tibial joint.
- Pain from osteoarthrosis interfered with the ram's ability to mount effectively.
- The ram's mating efficiency and serving capacity were severely affected.
Implications:
- Chronic pain from joint issues can significantly impair reproductive performance in rams.
- Early diagnosis of conditions like osteoarthrosis is vital for maintaining flock fertility.
- Understanding behavioral changes is key to identifying underlying physical limitations in breeding animals.