Endogenous opioids are involved in abnormal stereotyped behaviour of tethered sows

G.M. Cronin, P.R. Wiepkema, J.M. van Ree

    Research output: Contribution to journalArticleAcademicpeer-review

    80 Citations (Scopus)

    Abstract

    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 data implicate endorphins in this strategy. The involvement of endorphins in the stereotypies of the sows may be related to the calming, rewarding and dependency-inducing effects of the endorphins.
    Original languageEnglish
    Pages (from-to)527-530
    JournalNeuropeptides
    Volume6
    Issue number6
    DOIs
    Publication statusPublished - 1985

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