factors that may influence sperm freezability, such as season, diet, breed, or
ejaculate fractions are discussed, together with the effects of different additives, like
seminal plasma and antioxidants. After briefly referring to the effects of long-term sperm
preservation in frozen state and the reproductive performance of frozen-thawed boar
sperm, this work speculates with new research horizons on the preservation of boar
sperm, such as vitrification and freeze-drying.