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Behavioural and physiological differences between silver foxes selected and not selected for domestic behaviour

By M. Harri, J. Mononen, L. Ahola, I. Plyusnina, T. Rekila

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The degree of domestication of an animal is difficult to estimate because the animal's phenotype depends not only on its genetic make-up but also on its experiences during ontogeny. In addition, comparisons between wild and domestic animals suffer from the lack of a proper reference population. In this study, the offspring of silver foxes (Vulpes vulpes) that had been selected specifically for tameness for more than 30 generations (NOVO) were compared with normal Finnish farmed foxes (FIN) and with reciprocal hybrids between these two strains (Finland). All animals were housed under standard farm conditions without any extra handling. The NOVO foxes had higher domestication indexes and lower fearfulness scores than the FIN foxes, with their hybrids showing values in between. Almost all NOVO foxes started eating in the presence of a human and took a titbit from him, whereas only a few FIN foxes did so. Open field and urinary cortisol tests failed to discriminate between the genotypes. The NOVO cubs had lower levels of serum cortisol both before and after a stressful situation or ACTH injection and showed lower stress-induced hyperthermia than the FIN cubs, with the hybrids showing results in between. NOVO foxes can be used as a reference when developing and validating behavioural tests for use in the selection of less fearful silver foxes. The observed low fear levels and low stress hormone levels suggest better welfare in the NOVO foxes under standard farm conditions.

Date 2003
Publication Title Animal Welfare
Volume 12
Issue 3
Pages 305-314
ISBN/ISSN 0962-7286
Language English
Author Address Institute of Applied Biotechnology, University of Kuopio, FIN-70211 Kuopio, Finland.
Cite this work

Researchers should cite this work as follows:

  1. Animal behavior
  2. Animal rights
  3. Animal welfare
  4. Cortisol
  5. Developed countries
  6. Domestication
  7. Europe
  8. Fear
  9. Finland
  10. Foxes
  11. Hybrids
  12. Hydrocortisone
  13. Mammals
  14. OECD countries
  15. peer-reviewed
  16. Scandinavia
  17. strains
  18. Stress
  1. peer-reviewed