Endogenous opioids are involved in abnormal stereotyped behaviours of tethered sows.

@article{Cronin1985EndogenousOA,
  title={Endogenous opioids are involved in abnormal stereotyped behaviours of tethered sows.},
  author={Greg M Cronin and P. R. Wiepkema and Jan M van Ree},
  journal={Neuropeptides},
  year={1985},
  volume={6 6},
  pages={527-30}
}
Tethered sows continuously performed stereotypies during a substantial part of the day time. A single subcutaneous injection with naloxone significantly decreased the profound stereotypies, while explorative behaviours of pigs were not affected by naloxone. In addition a long-term effect of naloxone was noticed. It is suggested that performing the seemingly purposeless stereotypies may function as an effective strategy in order to cope with the conflict-inducing housing conditions. The present… CONTINUE READING

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