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Immunocastration with Improvac™ reduces aggressive and sexual behaviours in male pigs

By Veronica Brewster, Amanda Nevel

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Abstract

Surgical castration of male pigs is a common practice to reduce the risk of boar taint, an accumulation of pheromones in the muscles of pigs giving an undesirable odour to the pork of entire boars. Castration is not widely practiced in the UK for welfare reasons and indeed, assurance schemes will not allow castrated animals into their markets. Immunocastration maintains entire male pigs in a pre-pubescent state and as such prevents boar taint in the meat. The aim of this study was to investigate the effect of early vaccination with a gonadotrophin releasing factor (GnRF) vaccine Improvac™ (Pfizer Ltd) on aggressive and sexual behaviour of group housed male pigs. Pigs were housed in 8 groups each containing 9–10 pigs per group. Male pigs were assigned to two groups: a control group administered 2 doses of a placebo (n=38) and a vaccinated group administered 2 doses of Improvac™ (n=38). Behavioural observations began one week after the second dose when the pigs were 16 weeks old. Pigs were video recorded for 30min once a week for 10 weeks. Video recordings were reviewed and the frequency of behaviours associated with sex and aggression were recorded on a pen basis. The activity of pigs was also recorded every 5min during the 30min observation period to determine any differences between vaccinated and control groups. A generalised linear mixed model was used for data analysis. The results of the model showed a significant difference between vaccinated and control groups for knocking (P

Date 2013
Publication Title Applied Animal Behaviour Science
Volume 145
Issue 1
Pages 32-36
ISBN/ISSN 0168-1591
Publisher Elsevier
DOI 10.1016/j.applanim.2013.01.012
Language English
Additional Language English
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Researchers should cite this work as follows:

Tags
  1. Aggression
  2. Animal behavior
  3. Animal physiology
  4. Animal reproduction
  5. Animals
  6. Automation
  7. Behavior and behavior mechanisms
  8. Boars
  9. British Isles
  10. Castration
  11. Commonwealth of Nations
  12. Control
  13. Developed countries
  14. Effect
  15. Embryology
  16. Europe
  17. Hormones
  18. Mammals
  19. Markets
  20. mean animals
  21. Meat.
  22. Meat production
  23. muscles
  24. Nutrition
  25. OECD countries
  26. peer-reviewed
  27. pheromones
  28. Pigs
  29. placebos
  30. pork
  31. Resistance and Immunity
  32. Sexual behavior
  33. Suiformes
  34. surgery
  35. ungulates
  36. United Kingdom
  37. vaccination
  38. vertebrates
  39. video recordings
Badges
  1. peer-reviewed