The freezing and thawing of boar spermatozoa induces cell alterations that can affect sperm fertilizing ability.
Some of these alterations are linked to damage in sperm plasmalemma and oxidative stress. The addition of BHT on
semen extender improves sperm quality. The protective effect of this antioxidant is attributed to two mechanisms: firstly, the incorporation of the compound in the sperm membranes, which makes them more fluidic and prevents
them from the damage [17], and secondly, reducing the damaging potential of lipid peroxyl radicals by conversion into hydroperoxides