Testicular development and maturation of the hypothalamic-pituitary-testicular axis in the male tammar, Macropus eugenii

Journal of Reproduction and Fertility
P WilliamsonM B Renfree

Abstract

Testicular growth and maturation of the hypothalamic-pituitary-testicular axis were assessed in male tammars from 12 to 25 months of age to establish the time of sexual maturity. The testicular dimensions and body weights of 20 male tammars, approximately 12 months of age at the beginning of the study, were measured monthly for 1 year. Groups of 3 animals were castrated at 13, 19 and 25 months of age and their testes sectioned for histological examination. Testicular volume increased between 12 and 24 months of age and was highly correlated with body weight (r = 0.91). In the 13-month group the seminiferous tubules were closed with few mitotic figures. Spermatogenesis had begun in 2 of the 19-month animals. All stages of spermatogenesis were present in the other 19-month male, and in all of the 25-month males. Basal FSH concentrations increased with the age of the animal (21.0 +/- 32.48, 94.40 +/- 55.18 and 193.05 +/- 40.21 ng/ml (mean +/- s.d.) at 19, 20 and 25 months respectively) while basal LH concentrations were similar at 20 months and 25 months (0.43 +/- 0.18 and 0.58 +/- 0.25 ng/ml respectively). Basal testosterone concentrations were also similar 0.11 +/- 0.04, 0.35 +/- 0.16 and 0.22 +/- 0.10 ng/ml in 13-, 19- and 25-m...Continue Reading

Citations

Apr 14, 2009·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·Tim S JessopDevi Stuart-Fox
Oct 9, 2013·Reproduction : the Official Journal of the Society for the Study of Fertility·P R S SantosA C Assis Neto
Jan 14, 2009·Reproduction : the Official Journal of the Society for the Study of Fertility·Yanqiu HuMarilyn B Renfree
Jun 30, 2005·Reproduction : the Official Journal of the Society for the Study of Fertility·Emily F HynesMarilyn B Renfree
Apr 7, 2010·Hormones and Behavior·Nanette Y SchneiderMarilyn B Renfree
Dec 12, 2007·Journal of Anatomy·Christopher M ButlerMarilyn B Renfree
Jun 10, 2011·Biology of Reproduction·Danielle E HickfordMarilyn B Renfree
Oct 31, 2016·Sexual Development : Genetics, Molecular Biology, Evolution, Endocrinology, Embryology, and Pathology of Sex Determination and Differentiation·Keng Y Chew, Marilyn B Renfree
Sep 4, 2007·Journal of Anatomy·Justyna Zofia PaplinskaMarilyn B Renfree
Mar 2, 2010·Reproduction, Fertility, and Development·Emily J MillerCatherine A Herbert
Feb 13, 2010·Cold Spring Harbor Protocols·Danielle HickfordMarilyn B Renfree

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