This research objective was to examine microscopic semen quality on bull that given the somatrotopin hormone (bST). This research was implemented in August November 2012 to March 2013 at The Regional Laboratory Technical Implementation Unit (UPTD) Artificial Insemination Center (BIB) South Sumatra. The research used 3 heads of cattle aged over 10 years were maintained at BIB South Sumatra. 3 bu…