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Metabolism of Bull Semen. I. Inorganic and Total Phosphorus Relationships¹

Department of Dairy Science, State College of Washington, Pullman

ABSTRACT

Inorganic and total phosphorus determinations on 506 semen samples collected over a 7-month period from 36 bulls of high fertility showed a marked relationship between sperm concentration and total phosphorus (r = 0.88). Inorganic phosphorus content of semen before and after incubation for 1 hour at 37° C. was most closely correlated with sperm concentration (r = 0.23) and showed unimportant relationships with initial motility, fructose, and fructose utilization.

Inorganic phosphorus increased 1.4 mg. % or 8.2% (P < 0.01) during incubation for 1 hour at 37° C. This change was not related to bulls, breeds, months, or any of the semen quality measures. There was no relationship between inorganic and total phosphorus and nonreturn rate.

¹ Scientific Paper No. 1397, Washington Agricultural Experiment Stations, Pullman. Project 1107.