Lameness is one of the most significant welfare concerns in sheep flocks, causing chronic pain, reduced productivity, and impaired quality of life. Systematic lameness scoring provides objective welfare data and enables targeted management intervention.
Why Lameness Scoring Matters
Shepherd observation of lameness in sheep is frequently inaccurate — surveys show stockpersons miss a significant proportion of lame sheep, particularly those with mild or moderate lameness. Structural scoring systems provide:
- Consistent, objective assessment independent of individual observer judgement
- Baseline data for tracking flock trends over time
- Documentation for benchmarking against industry targets
- Evidence for identifying high-risk periods and management triggers
Zinpro Locomotion Scoring (ZLS) for Sheep
The Zinpro 0–3 scale is widely used in sheep:
- Score 0 (Sound): Moves freely; no abnormality in gait
- Score 1 (Mildly lame): Slight unevenness in gait; may head-bob; not obviously distressed
- Score 2 (Moderately lame): Obvious lameness; reluctance to bear full weight; reduced grazing; may fall behind the group
- Score 3 (Severely lame): Marked lameness or non-weight bearing; may adopt tripod posture; clear welfare emergency
Target Lameness Prevalence
The industry target for sheep lameness prevalence is <2% of the flock lame at any one time. Current UK average is estimated at 7–10% — meaning most flocks significantly exceed the welfare target. Farms achieving <2% prevalence demonstrate that high welfare lameness management is achievable.
Five-Point Plan for Sheep Lameness
AHDB's evidence-based Five-Point Plan provides the framework for lameness control:
- Treat all cases promptly (within 3 days of first observation)
- Cull chronically lame sheep that fail to respond
- Vaccinate against footrot where Dichelobacter nodosus is present
- Avoid buying in lameness (biosecurity)
- Use footbath strategically (zinc sulphate for footrot prevention)
Record-Keeping and Review
Recording individual sheep lameness events and responses to treatment enables identification of chronic cases, breed or family susceptibility patterns, and seasonal risk periods. Quarterly review with the farm vet supports proactive management and appropriate antimicrobial stewardship.