Antioxidant effects of bovine serum albumin on kinetics, microscopic and oxidative characters of cryopreserved bull spermatozoa

The aim of this study was to determine the effects of bovine serum albumin (BSA) as an antioxidant on post-thaw characters of bull spermatozoa such as motion variables, viability, plasma membrane integrity, morphology, lipid peroxidation, total antioxidant capacity (TAC), total thiols (TT) and the enzymes activities. Ejaculates were collected from six proven bulls and diluted with a citrate-based extender supplemented with various concentrations of BSA (0, 0.5, 1, 1.5 and 2 g/100 mL). The results showed that the semen extender supplemented with various concentrations of BSA increased (p0.05) were detected in progressive motility, sperm track straightness, beat cross frequency, curvilinear velocity and malondialdehyde production between the experimental groups. The highest concentration of BSA (2 g/100 mL) in the semen extender reduced (p<0.05) the sperm motion variables. The results indicated that the most effective concentration of BSA is 1 g/100 mL in the semen extender which is associated with an increase in the total motility, antioxidant enzymes activities, TT and TAC