In an attempt to evaluate the protective effect of a lipid-soluble antioxidant (butylated hydroxytoluene; BHT), semen from four dogs (Canis familiaris) was frozen in two different extenders (Uppsala or INRA-96 plus glycerol) with or without 1mM BHT. Sperm membrane integrity using flow cytometry and motility using a computerized system were evaluated in each experimental group. The Uppsala extender was superior in all aspects of sperm function. The percentage of sperm membranes was significantly higher in semen samples frozen in presence of BHT. Our results suggest that the Uppsala extender can be improved with the addition of BHT.
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