The seasonal pattern of testosterone secretion in finn cross rams in Israel |
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| Institution: | 1. From Department of Endocrinology, Diabetes and Metabolism, Bayhealth, Dover, Delaware;2. Department of Endocrinology, Diabetes and Metabolism, Johns Hopkins University, Baltimore, Maryland;3. Department of Quantitative Health Sciences, Cleveland Clinic, Cleveland, Ohio;4. Department of Neurosurgery, Cleveland Clinic, Cleveland, Ohio;5. Department of Endocrinology, Diabetes and Metabolism, Cleveland Clinic, Cleveland, Ohio;6. Department of Neuro-Endocrinology in Clinical Neurological Surgery, Weill Cornell Medicine, New York, New York.;1. Department of Pharmacology, Faculty of Veterinary Medicine, Zagazig University, Zagazig 44511, Egypt;2. Department of Forensic Medicine and Toxicology, Faculty of Veterinary Medicine Zagazig University, Zagazig 44511, Egypt;3. Department of Biochemistry, Faculty of Veterinary Medicine, Zagazig University, Zagazig 44511, Egypt;4. Department of Pathology, Faculty of Veterinary Medicine, Zagazig University, Zagazig 44511, Egypt |
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| Abstract: | Three adult Finn cross rams were bled at 30-min intervals for 7 h in March, May–June, August and November, and again at hourly intervals for 2 h after an intravenous injection of 50 μg of a GnRH analogue. Plasma testosterone concentrations were measured by radioimmunoassay. The mean testosterone level from 15 blood samples for each ram was highest in November and lowest in March. The episodic pulse pattern of testosterone secretion during the 7-h blood sampling periods was most evident, and more similar among rams in August and November, and less so in March and May.The mean testosterone concentration from the blood samples collected 1 and 2 h after GnRH injection was significantly higher in August–November than in March–June, but the ratio of the testosterone level after to that before injection was highest in March and lowest in November. |
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