In the present study, significant increase of post-thaw progressive sperm motility was recorded
on addition of 2.0 ng ml−1 Bradykinin to the semen diluted in EYTG and subsequent freezing
and thawing at 0 and 48 h after freezing.
Significantly higher live sperm (%) and HOS (%) as compared to control were observed in the
present study using 2.0 ng ml−1 Bradykinin. This may possibly be due to better availability and
efficient utilization of energy by the sperm, especially during the stress of cryopreservation or
inefficient utilization of energy resources following Bradykinin degradation by Kininase II present
in seminal plasma (Somlev and Subev, 1998) and the role of Kallikrein (involved in the formation
of Bradykinin from its precursor Kininogen) in spermatogenesis and epididymal maturation of
spermatozoa (Haidl and Schill, 1993).