Long-term variations in plasma gonadotropins in early castrated male rabbits
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LH and FSH levels were determined by RIA in plasma samples collected every 10 days from 30 to 90 days and at 4, 5 and 6 months in control male rabbits and in rabbits castrated at 30 days of age. At all stages studied gonadotropin levels were significantly increased in castrates. Mean LH levels were not influenced by age in controls or in castrates. Mean FSH levels were age dependent and increased during sexual maturation in both groups. The results showed that the secretion of FSH, but not that of LH, may be stimulated during prepubertal and pubertal stages in males where steroidal inhibition is absent.
Key-wordsRabbit castration FSH LH puberty
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- 7.Berger M., J-ean-Faucher Ch., De Turckheim M., Veyssiere G., Jean C.I. Age-related changes in the feed-back regulation of gonadotropin secretion in the immature and adult male rabbit. Acta Endocrinol. (Kbh) 100: 18, 1982.Google Scholar
- 18.Berger M., Jean-Faucher Ch., De Turckheim M., Veyssiere G., Blanc M.R., Poirier J.C., Jean C.I. Testosterone, luteinizing hormone (LH) and follicle-stimulating hormone (FSH) in plasma of rabbit from birth to adulthood. Correlation with sexual and behavioural development. Acta Endocrinol. (Kbh) 99: 459, 1982.Google Scholar
- 20.Chubb C., Ewing L., Irby D., Desjardins C. Testicular maturation in the rabbit: secretion of testosterone, dihydrotestosterone, 5 α-androstan-3β, 17β-diol and 5 α-androstan-3β, 17β-diol by perfused rabbit testes-epididymides and spermatogenesis. Biol. Reprod. 18: 212, 1978.PubMedCrossRefGoogle Scholar
- 23.Conte F.A., Grumbach M.M., Kaplan S.L., Reiter E.O. Correlation of luteinizing hormone-releasing factor in-duced luteinizing hormone and follicle-stimulating hormone release from infancy to 19 years with the changing pattern of gonadotropin secretion in agonadal patients: relation to the restraint of puberty. J. Clin. Endocrinol. Metab. 50: 163, 1980.PubMedCrossRefGoogle Scholar
- 24.Swerdloff R.S., Heber D. Endocrine control of testicular function from birth to puberty. In: Burger H., De Kretser D. (Eds), The testis. Raven Press, New York, 1981, p. 107.Google Scholar
- 25.De Turckheim M., Berger M., Jean-Faucher Ch., Veyssiere G., Jean C.I. Changes in ovarian oestrogens and in plasma gonadotropins in female rabbits from birth to adulthood. Acta Endocrinol. (Kbh) 103: 125, 1983.Google Scholar