Sow Longevity and Welfare: Reducing Early Culling

Sow Longevity: Welfare, Productivity, and Sustainability

The lifespan of sows in commercial pig production is far shorter than their biological potential. Most commercial sows are culled after 3-5 parities (litters) — at 3-4 years of age — despite a potential lifespan of 15+ years and productive capacity through 8-10 parities. Early culling has welfare implications for individual animals and reflects welfare-relevant management failures.

Why Sows Are Culled Early

The most common culling reasons in commercial pig production include:

• Reproductive failure (failure to conceive, small litters, anestrus)
• Lameness — leg and foot problems are the leading welfare-related culling reason
• Poor body condition — sows unable to maintain adequate condition through lactation
• Prolapse (vaginal, rectal, or uterine) — painful and often fatal without rapid intervention
• Aggression — sows that are unsafe to handle or injure pen mates

Lameness as a Welfare and Longevity Issue

Lameness is the leading cause of premature, involuntary sow culling. Leg problems — including osteochondrosis, foot lesions, leg injuries — cause chronic pain and are often the welfare justification for euthanasia or early slaughter. Prevention requires attention to:

• Flooring quality — non-slip, appropriately sized slats, rubber matting
• Genetic selection for leg soundness alongside production traits
• Gilt development — adequate exercise and appropriate body condition before first farrowing
• Prompt identification and treatment of early foot problems
• Pen design minimizing injury during social interactions

Welfare of Productive Life

A sow culled after 3 parities has spent approximately 18 months in production — largely in gestation (individual or group housing) and farrowing (crate confinement). The welfare quality of this productive period depends entirely on management decisions around housing, nutrition, enrichment, and pain management. Improving welfare during the productive period is the primary welfare priority, independent of longevity.

Culling Process Welfare

Sows identified for culling require welfare attention through to the point of slaughter. Sows that are lame, in poor condition, or unwell may be unfit for transport — requiring on-farm euthanasia. When euthanasia is appropriate, it should be performed promptly rather than delayed in hopes of recovery. Transport of unfit sows to slaughter is a welfare failure that occurs when economic incentives override welfare obligations.