[Quality of spermatozoa and reproductive efficiency [swine]]

animal nutrition artificial insemination attitudine alla riproduzione boars calidad conservación del semen conservation du sperme conservazione dello sperma espermatozoo fecondazione artificiale inseminación artificial insémination artificielle nutrición animal nutrition animale nutrizione animale performance de reproduction quality qualità qualité reproductive performance reproductividad semen semen preservation sperma spermatozoa spermatozoi spermatozoïde sperme verraco verrat verri