The in vitro methods for semen evaluation in pigs.

Artificial insemination is increasing in commercial piggeries. Therefore, t he knowlegde on semen quality and its associated fertilization rates have g ained importance. The usual in vitro laboratory techniques for semen evalua tion do not test the sperm fertilization capacity, although new methods, as Osmotic Resistence Test or In Vitro Fertilization Techniques (SPA and IVF) , have recently solved this important restriction. The Hypoosmotic Swelling Test, largely carried out in most species because of its relationship with fertility, does not offer similar results in pigs. The purpose of our stud y is to show up the in vitro methods developed for semen evaluation in pigs , specially those normally practised in most laboratories. We also examine their different specifications on fertility relationship.