There are controversial reports in the available literature regarding concentration of ascorbic acid in seminal plasma and its possible role in reporductive potential of a bull (Phillips : and Lardy, 1940; Parez and Parez, 1957; Danotiya and Srivastva, 1979; Stoyanov, 1985 and Jain, 1987). This gave us an idea to study the concentrations of ascorbic acid in bovine seminal plasma in relationn to age of bull, sperm motility and concentration.