1. 5α-ANDROSTENONE IN PERIPHERAL PLASMA OF PIGS, DIURNAL VARIATION IN BOARS, EFFECTS OF INTRAVENOUS HCG ADMINISTRATION AND CASTRATION
- Author
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Andresen O
- Subjects
Male ,medicine.medical_specialty ,Time Factors ,Swine ,Endocrinology, Diabetes and Metabolism ,Radioimmunoassay ,Chorionic Gonadotropin ,chemistry.chemical_compound ,Sex Factors ,Endocrinology ,Internal medicine ,Testis ,medicine ,Animals ,Testosterone ,Castration ,Plasma samples ,Body Weight ,Mean value ,Diurnal temperature variation ,Peripheral plasma ,Androstenone ,General Medicine ,Ketosteroids ,Stimulation, Chemical ,Circadian Rhythm ,chemistry ,Androstenes ,Female - Abstract
5α-Androstenone2) has been measured in pig peripheral plasma by radioimmunoassay (RIA). In 73 mature boars values ranging from 1.2 ng to 54.1 ng per ml plasma with a mean value of 18.3 ng/ml and sd = 15.9 were found. In female pigs and castrated male pigs the mean concentrations were 2.3 ng/ml (n=18) and 1.1 ng/ml (n=19) with sd = 0.8 and sd = 0.3 respectively. Clear-cut diurnal variations in the concentration of 5α-androstenone in plasma samples from boars were not observed. Intravenous injection of HCG in boars caused an abrupt rise in the 5αandrostenone level reaching a maximum in 90 min. Twenty-eight hours after the injection a second peak of plasma 5α-androstenone was observed. Following castration of boars the level of 5α-androstenone in peripheral plasma fell within 4 days, to levels found in female pigs.
- Published
- 1975
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