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Effect of Thyroxine on Oxygen Consumption of Bovine Spermatozoa and Semen¹

Department of Dairy Husbandry, Agricultural Experiment Station, University of Nebraska, Lincoln

ABSTRACT

Bovine spermatozoa and semen, diluted with a phosphate buffer, were treated with 7 y percent DL-thyroxine.

Oxygen consumption generally was increased with the addition of thyroxine in semen samples with an original spermatozoan concentration of from 800,000 to 1,400,000 per mm.³

Semen samples with a spermatozoan concentration of less than 800,000 per mm.³ in the original semen were not influenced on the average by the presence of thyroxine in the concentration used.

The ability of semen to respond with increased respiration rate to added thyroxine appears to be related to some factor that is associated with original spermatozoan concentration.

The influence of bacterial and other contamination on results has been discussed. Its exact influence remains unevaluated.

¹ Published with the approval of the Director as Paper no. 449, Journal Series, Nebraska Agricultural Experiment Station.