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Metabolism of Bull Semen. III. Relation of Lactic Acid and its Accumulation during Incubation with Other Semen Quality Measurements and Nonreturns¹

Department of Dairy Science, State College of Washington, Pullman

ABSTRACT

In 1927, McCarthy et al. (20) observed the now well confirmed glycolytic ability of sperm with concomitant accumulation of lactic acid. Both manometric and chemical methods have been used. Glycolysis, as measured by lactic acid gain during storage or incubation, has been shown to be highly correlated with sperm concentration (3, 4, 6), initial motility (3, 4, 23), and storage motility (4, 26) but not appreciably with fertility (3, 4). Glycolysis and respiration rates have shown a correlation of ±0.77 for ram semen (4) on a sample within-ram basis.

Seminal sugar decrease recovered as lactic acid has been variable because of such factors as incubation time (5, 6, 26), type of incubation (5, 18, 19), type of diluent (5, 19, 26, 28), extent of dilution (5, 20, 26), and type of washing and suspension (5, 21). These recoveries have generally been 25 to 83% under aerobic conditions (5, 6, 19, 26) and up to 91% under anaerobic conditions (5, 19).

¹ Scientific Paper No. 1424, Washington Agricultural Experiment Station, Pullman. Project 1107.

² Address: Burlington, Wash.