Pig Lameness: A Key Welfare Indicator in Commercial Production

Lameness is one of the most significant welfare problems in commercial pig production, affecting sows particularly. Recognition, prevention, and treatment are essential components of welfare management.

Key Facts

Lameness prevalence in sow herds ranges from 10-40% in many commercial systems, making it among the most common welfare problems
Lameness causes chronic pain affecting feeding ability, social interactions, and reproductive performance
Causes include osteochondrosis (cartilage defects from rapid growth), foot lesions, joint infections, and traumatic injuries
Osteochondrosis is a developmental disease linked to genetics, rapid growth rates, and floor surfaces - high-growth breeds are most susceptible
Sow housing significantly affects lameness rates - concrete slats without adequate bedding cause higher foot lesion rates than rubber-coated or bedded surfaces
Regular lameness scoring by trained stockpeople using validated scoring systems enables early detection
Painful sows show reduced feed intake, lose body condition, and are more likely to be culled prematurely
Treatment with NSAIDs provides pain relief and improves welfare while specific treatments address underlying causes

Welfare Considerations

Pig lameness represents chronic, ongoing pain that is often normalized in commercial production contexts as an acceptable level of welfare harm. This normalization is unjustified - lameness scoring studies reveal that many commercial herds have unacceptable welfare burdens from untreated painful conditions. The welfare cost is not just physical: lame sows are subordinate in competitive environments, have reduced access to feed and water, and experience the social stress of being unable to escape aggressive interactions. Sows culled for lameness have often had prolonged painful conditions that preceded culling by weeks or months. Prevention through floor design, appropriate genetics, and body condition management is the highest-leverage intervention. Lameness monitoring with validated scoring at defined intervals and clear treatment thresholds transforms lameness from an accepted background welfare cost to a managed welfare metric.

What You Can Do

Train all stockpeople in pig lameness scoring using a validated scale - regular recording creates accountability
Implement lameness thresholds that trigger treatment - pigs with moderate lameness (score 2+) should receive NSAIDs promptly
Review housing design for rubber flooring, adequate space, and non-slip surfaces that reduce foot lesion development
Consider genetics: choose sow lines with documented better leg and feet conformation
Include foot inspection in regular health assessments - foot lesions cause significant lameness and are treatable
Track lameness prevalence as a welfare key performance indicator and target reduction over time
Do not delay culling of chronically lame sows that cannot be treated effectively - delaying causes prolonged suffering
Ensure lame sows can access feed and water without competition from mobile pen-mates