the effect of active immunization with gonadotropin releasing hormone conjugate (gnrh-bsa) on gonadosomatic indices (gsi) and sperm parameters in mice

Background: gonadotropin releasing hormone conjugate (gnrh-bsa) raisesantibodies against biologically active gonadotropin releasing hormone (gnrh) whichaffects body weight, gonadosomatic indices (gsi) and sperm quality in male mice.objective: the objective of this experimental investigation is to develop an effectiveand reliable hormonal immunocontraceptive vaccine to suppress spermatogenesis byusing gnrh-bsa conjugate.materials and methods: forty sexually mature mice, mus musculus were divided intotwo groups of twenty each. group 1, served as control, while group 2 were immunizedat monthly intervals for four times against gnrh with a gnrh-bsa conjugate (50 ?g)with aqueous adjuvant (freund's adjuvant). after 30 days of each immunization, bodyweight, gsi and sperm quality were observed in the immunized groups and comparedwith the control group.results: body weight showed alterations in immunized animals as compared to control.however, gsi, sperm motility, sperm count and sperm morphology were significantlydecreased in immunized animals throughout the experimental investigation and theseeffects were more prominent and significant in the later part of the experiment.conclusion: these results suggested that the active immunization against gnrhproduced bioeffective antibodies as indicated by significant reduction in gsi level andsperm quality and induced infertility in male mice.