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DOI: 10.15653/TPG-151145
Unterdrückung von Sexualverhalten und Fortpflanzung beim männlichen kleinen Wiederkäuer
Suppression of sexual activity and reproduction in male small ruminantsPublikationsverlauf
Received: 29. Dezember 2015
Accepted after major revision: 28. April 2016
Publikationsdatum:
20. Dezember 2017 (online)
Zusammenfassung
Der Umgang und die Haltung männlicher kleiner Wiederkäuer sind ab Eintritt der Geschlechtsreife oft mit erheblichen Schwierigkeiten verbunden. Die Kastration stellt derzeit die sicherste Methode zur Lösung dieses Problems dar. Eine Alternative wären medikamentöse Verfahren zur temporären Ausschaltung der Gonadenfunktion. Nach einem kurzen Überblick zur chirurgischen Kastration wird anhand einer Übersicht der Literatur das derzeitige Wissen zur Anwendung von Vakzinen gegen Gonadotropin-Releasing-Hormon (GnRH) sowie zur Verabreichung von GnRH-Agonisten beim Schafund Ziegenbock dargestellt. Beim Schafbock wurde die GnRH-Vakzination unabhängig vom Alter zum Zeitpunkt des Behandlungsbeginns erfolgreich zur temporären Unterdrückung der Fortpflanzung eingesetzt. Für den Ziegenbock liegen weniger Untersuchungen vor. Eine vollständige Unterdrückung der Spermatogenese gelingt nicht in allen Fällen. Die Verabreichung von GnRH-Agonisten stellt derzeit keine als sicher zu bezeichnende Methode zur Unterdrückung der Gonadenfunktion dar.
Summary
Handling and husbandry of male small ruminants after sexual maturity often become difficult. Castration is currently the most reliable solution to this problem. Medicinal procedures for temporary inhibition of the gonad function could provide an alternative. Following a short overview of surgical castration, the current knowledge on the application of vaccines against gonadotropin-releasing hormone (GnRH) and GnRH agonist in rams and billy goats is presented in a literature overview. In rams, GnRH vaccination has been used successfully for temporary suppression of the reproduction function, regardless of an animal’s age at the time of therapy initiation. Fewer investigations are available for the billy goat. A complete suppression of spermatogenesis was not achieved in all cases. Currently, treatment with GnRH agonists does not represent a relible method for the suppression of gonad function.
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