Effect of kallikrein on bull sperm motility in vitro.

The application of kallikrein--a kinin-releasing porcine pancreatic kininogenase--exerted considerable stimulation of bull sperm motility in vitro. The kallikrein was used in two concentrations: 1 and 100 KU/ml semen. Both concentrations gave similar effect: at the 4th hour of incubation at room temperature the motility rate of spermatozoa exceeded five and four times, respectively, that of the control samples. Higher penetrating ability of bull spermatozoa in cow's estral secretion was also recorded in the experimental samples treated with kallikrein in both concentrations at the 2nd and 4th hour of incubation in comparison with the controls.