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The aim of this study was to evaluate the effectiveness of a gonadotropin-releasing hormone (GnRH) vaccine, Improvac™ (Pfizer Ltd), in suppressing aggressive and sexual behaviour of male pigs. One hundred and thirty-six pigs were assigned to three treatments: entire male pigs (n= 64), immunocastration against GnRH (n= 48) and surgical castration (n= 24). Surgical castration was performed before the age of 1 week. Vaccination comprised two injections: the first injection was given 8 to 11 weeksdoi:10.1017/s175173111000011x pmid:22444270 fatcat:ivyhtvsdafe5bdhhdx4fft5rxq