Study summary · research use only
Gonadorelin-induced testosterone release: a biological assay for quality assurance of gonadorelin in veterinary medicine
Plain-language summary
Paraphrased from the published abstract below — not a verdict on whether anything works.
In this animal study, two experiments were conducted in bulls given norgestomet and gonadorelin to test whether gonadorelin-induced testosterone release could serve as a biological assay for gonadorelin quality assurance. The abstract reports that norgestomet implants (0 to 36 mg) reduced episodic release (r = -.81; P < .05) and mean testosterone concentrations (r = -.82; P < .05), and that gonadorelin-induced testosterone release increased (r = .99; P < .05) with increasing gonadorelin dosage up to 5 micrograms in norgestomet-implanted bulls. Maximal testosterone (a greater than sixfold increase) was released with 5 to 40 micrograms of gonadorelin. The authors describe the assay as sensitive (0.008 microgram per kg body weight for 5 micrograms of gonadorelin) with a rapid turnaround time.
Abstract
Two experiments were conducted with bulls administered norgestomet and gonadorelin to determine if the gonadorelin-induced release of testosterone could be developed into a biological assay for quality assurance of gonadorelin. Implants containing norgestomet (0 to 36 mg) reduced the episodic release (r = -.81; P < .05) and mean concentrations of testosterone (r = -.82; P < .05). Gonadoreline-induced testosterone release increased (r = .99; P < .05) with increasing dosage of gonadorelin (up to 5 micrograms) in norgestomet-implanted bulls (36 mg). Maximal testosterone was released (> sixfold increase) with 5 to 40 micrograms of gonadorelin. In summary, the gonadorelin-induced testosterone release in bulls administered a synthetic progestin is a sensitive (0.008 microgram per kg body weight for 5 micrograms of gonadorelin) biological assay with a rapid turnaround time for the confirmation of gonadorelin potency. Based on a per-kg-body-weight basis, the norgestomet-treated bull is the most sensitive biological assay model.
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