Aggression

• Adding sows to an established group
• Group systems
• Shape of yard

Infertility

• Stress after feeding
• Stress at feeding

Loss of sow identification

• Lost transponder tags / collars
• Thin sow
• Education - understanding
• Poor design and maintenance

Skin abrasions

• Aggression

Stress at mixing

• Badly designed ESF system

Variable litter size

• Embryo reabsorption / stress

Vulva biting

• Feeder design
• Poor pen/yard design
• Queuing for feed