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Aversion to carbon dioxide stunning in pigs: effect of carbon dioxide concentration and halothane genotype

By A. Velarde, J. Cruz, M. Gispert, D. Carrion, J. L. R. de la Torre, A. Diestre, X. Manteca

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Abstract

Aversion to the dip-lift stunning system and to the inhalation of 70 and 90% carbon dioxide was assessed in 18 halothane-free (NN) and 14 heterozygous halothane (Nn) slaughter weight pigs using aversion learning techniques and behavioural studies in an experimental slaughterhouse. Pigs were subjected to the treatments individually. When the dip lift system contained atmospheric air, the proportion of pigs that entered the crate voluntarily increased on subsequent days, indicating that pigs habituate to the stunning system. Based on the number of attempted retreats, for the first descent into the well with atmospheric air, Nn pigs were more reactive than NN pigs. On repeating the descent, Nn pigs showed greater habituation to the procedure. When the pit contained (either 70 or 90

Date 2007
Publication Title Animal Welfare
Volume 16
Issue 4
Pages 513-522
ISBN/ISSN 0962-7286
Language English
Author Address IRTA, Finca Camps i Armet, 17121 Monells, Girona, Spain. Antonio.Velarde@irta.es
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Tags
  1. Anesthesia
  2. Animal genetics
  3. Animal rights
  4. Animal slaughter
  5. Animal welfare
  6. Carbon dioxide
  7. Genotypes
  8. Incidence
  9. Inhalation
  10. Mammals
  11. Meat animals
  12. Methodologies
  13. nose
  14. Pain
  15. peer-reviewed
  16. perceptions
  17. Pharmacology & Pharmacy
  18. Posture
  19. Research
  20. slaughterhouses
  21. Studies
  22. stunning
  23. Swine
  24. Techniques
Badges
  1. peer-reviewed