Monitoring ovarian function and pregnancy in the giant panda (Ailuropoda melanoleuca) by evaluating urinary bioactive FSH and steroid metabolites

Journal of Reproduction and Fertility
S L MonfortD.E. Wildt

Abstract

Urinary excretion of oestrone conjugates, pregnanediol-3 alpha-glucuronide (PdG) and 20 alpha-hydroxypregn-4-en-3-one were measured from 8 weeks before oestrus to 2 weeks post partum and bioactive FSH was monitored during the periovulatory interval in a female giant panda. A biphasic urinary bioactive FSH excretory profile appeared to indicate a broad (approximately 10 day) follicular phase followed by a sharp preovulatory bioactive FSH surge coincident with an acute increase in urinary oestrone conjugates and behavioural oestrus. Weekly concentrations of urinary oestrone conjugates and PdG increased (P less than 0.001) by Week 9 of gestation with 20 alpha-hydroxypregn-4-en-3-one levels increasing 10-30-fold (P less than 0.001) between Weeks 11 and 14. These observations indicate that the monoestrous giant panda does not appear to require a prolonged period of endogenous FSH release or multiple FSH peaks for ovarian priming and follicle selection to proceed normally. Furthermore, the delayed rise in urinary steroid excretion during the second half of gestation in the giant panda supports the concept of delayed implantation while the estimation of steroid conjugates in urine offers a non-invasive approach for monitoring pregnanc...Continue Reading

Citations

Aug 21, 1992·European Journal of Obstetrics, Gynecology, and Reproductive Biology·E V YoungLaiJ Yeo
Mar 23, 2000·Theriogenology·W R BooneR J Schuett
Aug 21, 2009·Reproduction : the Official Journal of the Society for the Study of Fertility·Hemin ZhangVanessa Hull
Apr 22, 2010·Reproduction : the Official Journal of the Society for the Study of Fertility·David C KerseySteven L Monfort
Jul 6, 2011·General and Comparative Endocrinology·David C KerseySteven L Monfort
May 10, 2005·Hormones and Behavior·J F Cockrem
May 23, 2006·Theriogenology·Barbara S DurrantAlice Cheng
Jul 29, 2003·Journal of Experimental Zoology. Part A, Comparative Experimental Biology·Laura Clamon SchulzJanice M Bahr
Jan 1, 1990·The Journal of Experimental Zoology. Supplement : Published Under Auspices of the American Society of Zoologists and the Division of Comparative Physiology and Biochemistry·S L MonfortD E Wildt
May 15, 1994·The Journal of Experimental Zoology·L A JohnstonJ Rieffenberger
Jul 2, 2010·Reproduction, Fertility, and Development·David C KerseySteven L Monfort

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