Evaluate the fresh and Post Thawing Quality of Holstein Friesian Bull semen

TThe   study   was  carried   out   during the yearr  2017   to   determine   the   fresh   and   post-thaw   quality   of   four   Holstein   Friesian   bulls.   Semen   samples   were   examined   for ejaculate   volume,   pH,   mass   activity,   sperm   concentration   and   sperm   motility and   sperm   membrane   integrity   (HOST).   The   ejaculated   semen   volume   of   Holstein   Friesian   bulls   was   in   the   range   of   6-8ml   and   differences   in   ejaculates   were   significant   (P<0.01).   The   volume   was   significantly   (P<0.05)   higher   (7.75ml)   when   collected   on   5th   July,   slightly   decrease   in   volume   (7.25ml)   when   collected   on   12th   May   and   26th   July.   Semen   pH   was   higher   (6.65)   for   26th   July   ejaculation   and   lowest (6.55ml)   for   24th   May   ejaculation.   The   results   indicated   that   the   semen   of   Holstein   Friesian   bulls   did   not   have   considerable   variation   in   pH   during   May   –   July.   Most   of   the   semen   samples   were   creamy   white and   yellow   in   colour,   while   few   samples   were   milky   white   and   watery.   Mass   activity   score   of   semen   samples   indicated   vigorous   movement with   moderate rapid   waves   and   eddies.   The   sperm   motility   of   fresh   vs   post-thaw   semen   was   obtained   72.80   vs   48.75   percent   (12th   May),   75.00   vs   48.75   percent   (24th   May),   76.25   vs   55.00   percent   (2nd   June),   73.75   vs   52.50   percent   (21st   June),   75.00   vs   56.25   (5th   July)   and   75.00   vs   50.00   percent   (26th   July).   In   case   of   post-thaw   semen,   highest   sperm   motility   of   56.25   percent   was   recorded   in   semen   ejaculated   on   5th   July,   while   lowest   post-thaw   sperm   motility   of   48.75   percent   was   observed   in   semen   ejaculated   on   12th   May   and   24th   May.   Highest   sperm   concentration   of   1549.75x106   was   determined   in   semen   ejaculated   on   21.06.2017   and   lowest   concentration   (1259.50x106)   in   26.07.2017   collected   samples.   It   was   concluded   that   sperm   motility   was   significantly   (P<0.01)   affected   by   semen   types   (fresh   and   post-thaw),   while   sperm   concentration   was   also   significantly   (P<0.01)   affected   by   ejaculation   date   and   bulls.   The   membrane   integrity   (HOST)   of   the   pooled   data   on   fresh   semen   samples   over   a   period   of   three   months   was   58.37   percent   against   post-thaw   membrane   integrity   of   44.79   percent.