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🐷 Pig Breeding Herd Welfare

The Breeding Herd — Key Welfare Challenges

Modern commercial pig breeding herds present unique welfare challenges compared to finishing herds. Breeding animals live longer, are exposed to the full reproductive cycle multiple times, and the cumulative welfare impact of each reproductive decision compounds over a sow's lifetime.

Sow Welfare Through the Reproductive Cycle

Service and Early Pregnancy

The period around service (mating) is critical both for welfare and reproductive success. Welfare considerations include:

• Sow body condition at service (target BCS 3–3.5 on 5-point scale) — thin or over-conditioned sows have poorer outcomes
• Boar exposure for oestrus detection — daily 15-minute boar contact improves oestrus detection rates
• Stress at service impairs conception — avoid stressors (movement, mixing, loud noises) around mating
• Post-service management: minimise heat stress, avoid aggressive pen mixing in first 28 days post-service

Gestation Housing

The EU ban on individual stalls for most of gestation (implemented 2013) was a major welfare advance. Sows must be housed in groups from 4 weeks post-service until one week before farrowing. Group housing allows for social interaction, more natural behaviour, and better physical fitness — all welfare positives.

However, group housing introduces new challenges: aggression, competition for food, injuries, and poor condition in subordinate sows. Management keys include:

• Stable groups where possible (avoid frequent remixing)
• Adequate space: EU minimum 2.25 m² per sow, but 3+ m² significantly reduces aggression
• Electronic sow feeding (ESF) systems allow individual feeding in groups — reducing competition
• Enrichment: straw, rooting materials, objects for manipulation
• Regular body condition monitoring — thin sows in group systems need identification and remedial feeding

The Farrowing Period

The standard farrowing crate is the most significant welfare controversy in pig production. Crates confine the sow completely for 3–5 weeks around farrowing to prevent crushing of piglets. While effective at reducing piglet mortality, they cause significant suffering through:

• Complete restriction of movement and natural behaviours
• Inability to perform nesting behaviour — sows show intense frustration before farrowing
• Muscle weakness and joint problems from prolonged confinement
• High rates of stereotypic behaviour (bar-biting, rooting movements)

Free-farrowing systems (loose-housed farrowing pens, PigSAFE pens, UltraSow systems) allow sows to move freely while managing crushing risk through pen design. Multiple EU countries including Germany and Switzerland have committed to or implemented farrowing crate bans. The UK Farrowing Crate Action Plan targets ending routine use.

Lactation

Lactation makes high demands on sow body reserves. Welfare challenges include:

• Adequate feed and water intake (lactating sows need 6+ kg/day of high-quality feed)
• Heat stress in summer — sows and piglets have conflicting temperature needs
• Mastitis and MMA (mastitis-metritis-agalactia syndrome) cause pain and reduce milk supply
• Weaning stress — abrupt weaning (typically 21–28 days) causes distress in both sow and piglets

Gilt Management and Welfare

Gilts (first-parity females) are at highest risk of welfare problems and reproductive failure. Key considerations:

• Selection: only well-grown, sound-legged gilts with good temperament should be retained
• Socialisation: gilts should have appropriate social experience before group housing
• Gilt developer units: growing gilts in appropriate social groups before introduction to the breeding herd
• First parity farrowing: gilt farrowing performance is lowest — good supervision and assistance reduces piglet mortality and sow stress

Boar Welfare

Boars are frequently the most neglected animals in terms of welfare monitoring:

• Social isolation: boars are typically housed individually — provide stimulation and human contact
• Exercise: boars need daily access to exercise areas; lameness is common in confined boars
• Libido and service frequency: over-use causes welfare problems; recommended maximum 1–2 services per day
• Tusk management: regular tusk trimming prevents injury to handlers and other pigs
• Culling decisions: lame or unthrifty boars should be humanely culled promptly

Longevity and Culling

Sow longevity (number of productive parities) is both a welfare and economic indicator. Average UK sow lasts only 2.5–3 parities before culling. Improving longevity through better leg health selection, appropriate body condition management, and reducing disease burden improves lifetime welfare.