Pig Sow Body Condition Scoring and Welfare

Body condition scoring in sows is a key welfare and productivity tool, helping farmers prevent both obesity and underweight conditions that cause significant health problems throughout the reproductive cycle.

Key Facts

Sows are scored on a 1-5 scale from emaciated to obese based on fat cover over the spine and hip bones
Target BCS at farrowing is typically 3.0-3.5 to ensure adequate energy reserves for lactation
Thin sows (BCS below 2.5) at farrowing have higher rates of stillbirth and produce smaller, weaker piglets
Obese sows (BCS above 4) face increased farrowing difficulties, heat stress, and metabolic disorders
Sows lose body condition during lactation as milk production demands exceed feed intake capacity
Group housing complicates BCS management as dominant sows may out-compete subordinates for feed

Welfare Considerations

Poor body condition in sows is both a welfare indicator and a cause of further welfare problems. Thin sows experience metabolic stress, reduced immune function, and impaired mothering ability. Obese sows suffer joint pain, cardiovascular strain, and difficult farrowings including prolonged labour that harms both sow and piglets. Regular BCS monitoring — weekly for sows in late pregnancy — enables timely dietary adjustments. Adequate feeder space, electronic sow feeders, and management of social hierarchies in group housing systems are important for ensuring all sows access adequate nutrition.

What You Can Do

Support farm assurance schemes that require documented body condition scoring programmes for sow herds
Advocate for higher minimum space allowances in group sow housing to reduce feeding competition
Choose pork from producers using free farrowing systems that allow natural sow behaviour around birth
Ask farm assurance schemes to publish their body condition scoring requirements and audit outcomes