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Effect of Thyroxine on Fertility of Bovine Semen¹

Department of Dairy Husbandry, University of Nebraska, Lincoln

ABSTRACT

Ten micrograms per cent of D,L-thyroxine was added to diluted bovine semen. This semen was used in artificial breeding.

All treated services (2,289) averaged 5.7 to 6.7 percentage units higher in percentage of non-returns to service after 5 months than untreated semen from the same bulls collected during the same months that the treated semen was used. In a comparison of either individual bulls or individual breeding associations, an increase in non-return rate is also apparent with thyroxine-treated semen.

The increase in fertility with the addition of thyroxine appears to be maintained for a 4-day storage period with semen of average or above average fertility.

¹ Published with the approval of the Director as Paper No. 462, Journal Series, Nebraska Agricultural Experiment Station.