This antioxidant has been tested successfully to minimize cold shock damage in goat [15], bull [16], buffalo [17], dog [18], and boar . Moreover Roca et al. [4] evaluated the post thaw sperm ability to produce embryos in vitro and develop to the
blastocyst stage. No study has been conducted to evaluate the actual impact of supplementing freezing extender with
BHT on in vivo fertilizing ability of boar spermatozoa.