Adrenal and ovarian sources of progesterone secretion in young female fallow deer, Dama dama

Journal of Reproduction and Fertility
G W AsherD Duganzich

Abstract

Six young female fallow deer, including 3 that were ovariectomized at 9 months of age, were blood sampled at frequent intervals after i.v. injections of (1) ACTH analogue (tetracosactrin), (2) GnRH analogue (buserelin) and (3) saline solution on separate occasions at 11, 13, 15 and 18 months of age. Relative to prechallenge plasma values, ACTH administration resulted in a 4-10-fold increase in mean plasma progesterone concentrations, but only a 10-45% increase in mean plasma cortisol concentrations, within 40 min for entire and ovariectomized does during the prepubertal periods (11, 13 and 15 months) and for ovariectomized does during the post-pubertal period (18 months). Post-pubertal entire does exhibited high mean basal plasma progesterone concentrations (3-4 ng/ml) indicating a luteal source of secretion, with the ACTH-induced progesterone response being additive to the luteal progesterone but of similar magnitude to responses in the ovariectomized does. There was no significant ACTH challenge effect on mean plasma LH concentrations for entire or ovariectomized does at all ages. GnRH administration had no significant effects on mean plasma concentrations of progesterone and cortisol of entire and ovariectomized does, althou...Continue Reading

Citations

Mar 7, 2001·Small Ruminant Research : the Journal of the International Goat Association·W J. EnrightD J. Prendiville
Oct 30, 2012·Theriogenology·Robert B McCorkellGregg P Adams
Apr 19, 2011·Animal Reproduction Science·G W AsherR P Littlejohn
Jun 9, 2009·Animal Reproduction Science·Eveline Dos Santos ZanettiJosé Maurício Barbanti Duarte
Aug 19, 2008·Theriogenology·R B McCorkellG P Adams
Jan 4, 2018·Journal of Zoo and Wildlife Medicine : Official Publication of the American Association of Zoo Veterinarians·Concepción Ahuja-AguirreFelipe Montiel-Palacios

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