Effect of selenium and vitamin E supplementation on semen properties and freezability of ram semen

additif aux aliments des animaux aditivos de piensos blood serum body weight bélier chemicophysical properties congelación congélation feed additives freezing morueco peso corporal poids corporel propiedades fisicoquímicas propriété physicochimique rams selenio selenium semen sperme suero sanguíneo sérum sanguin vitamin e vitamina e vitamine e