SERUM TESTOSTERONE AND ESTROGEN CONCENTRATIONS IN HOLSTEIN-FRIESIAN BULL AFTER SUCCESSIVE EJACULATIONS

  • 1 January 1976
    • journal article
    • research article
    • Vol. 37  (4) , 465-467
Abstract
The testosterone and estrogen concentrations in venous serum of 4 mature Holstein-Friesian bulls were determined by radioimmunoassay before and after each of 3 consecutive semen collections taken at 1 h intervals. The hormonal concentrations were highly variable for the 2 steroids, but uniform in their patterns after the bulls had ejaculated. After the 3rd semen collection, marked changes in hormonal concentrations did not occur.

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