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Agonistic behaviour, skin lesions and activity pattern of entire male, female and castrated male finishing pigs

By B. Bunger, L. Schrader, H. Schrade, B. Zacharias

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Abstract

Fattening of intact boars is the least invasive alternative to the detrimental welfare effects of surgical castration of piglets. However, beside problems such as boar taint the divergent agonistic and sexual behaviour of boars may impair the pigs' welfare during fattening. To evaluate the effect of sex on agonistic interactions a total of 108 female, 108 castrated male and 108 entire male German crossbred pigs with an initial average body weight of 25 kg were kept in nine pens during three replicates with 12 pigs per pen respectively (1.2 m 2 per pig) separated by sex. Pigs were slaughtered at about 115 kg body weight. Agonistic behaviour was recorded 24 h before and 24 h after, and skin lesion scores (from 0 to 3) were recorded four days before and three days after half of the pigs have been removed in each pen for slaughtering. In addition, the daily activity pattern of groups was examined by a motion sensor system during 72 h before removing half of the pigs of a group. The frequency of mounting, knocking and fighting was significantly higher in entire males both before and after removing half of the pigs from groups. Disturbance of social structure by removing half of the pigs per group did not affect the total number of agonistic interactions in any sex. Entire males showed a higher incidence of skin lesions at the neck and the ham before, and at the shoulder after half of the pigs were removed for slaughtering. However, the severest lesion score 3 was not found in any group and for score 2 the highest incidence of 3.7% was found at the shoulder of entire males after removing half of the pigs per group. The activity pattern of the pigs was not affected by sex. It was concluded that under housing conditions used in the present study (ad libitum feeding and low stocking density) fattening of entire male pigs can be done without severe detrimental effects on their welfare.

Publication Title Applied Animal Behaviour Science
Volume 171
Pages 64-68
ISBN/ISSN 0168-1591
DOI 10.1016/j.applanim.2015.08.024
Language English
Author Address Friedrich-Loeffler-Institut, Institute of Animal Welfare and Animal Husbandry, Dornbergstrasse 25/27, D-29223 Celle, Germany.lars.schrader@fli.bund.de
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Tags
  1. Agonistic behavior
  2. Animal behavior
  3. Animal housing
  4. Animal nutrition
  5. Animals
  6. Animal welfare
  7. Boars
  8. Body weight
  9. Breeding
  10. Castration
  11. Crossbreds
  12. Diurnal variation
  13. Effect
  14. Feeding
  15. Feeding frequency
  16. Finishing
  17. Incidence
  18. Interactions
  19. Lesions
  20. Mammals
  21. peer-reviewed
  22. pens
  23. Pigs
  24. Sexual behavior
  25. skin
  26. skin lesions
  27. slaughter
  28. social structure
  29. stocking density
  30. Suiformes
  31. surgery
  32. ungulates
  33. vertebrates
Badges
  1. peer-reviewed