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Influence of Semen Collection Techniques on Composition of Bull Seminal Plasma

Department of Animal Science, Cornell University, Ithaca, New York 14850

ABSTRACT

Seminal plasma from semen collected with an artiflcial vagina at 55 C contained slightly higher fructose concentrations (P < .01) and slightly lower chloride concentrations (P < .05) than plasma from semen collected at 38 C. However, neither artificial vagina temperature nor length had any significant effect on glycerylphosphorylcholine concentration of seminal plasma, freezing point depression, or the total amounts of chloride, fructose, or glycerylphosphorylcholine per ejaculate. First ejaculates and semen collections after five days of sexual rest were higher in glycerylphosphorylcholine and lower in chloride concentration than corresponding second ejaculates or collections after two days of sexual rest. There was a high positive correlation hetween sperm and glycerylphosphorylcholine concentrations (r = .84 on a within bull-experimental day basis) and negative correlations existed among glycerylphosphorylcholine, fructose, and chloride concentrations of seminal plasma. These relationships were expected on the basis of sources of these components in semen. No significant relationships between levels of any of the constituents and sperm motility before or after freezing were found.