PMID: 18402759Apr 12, 2008Paper

Testosterone secretion, testicular histology and the cryopreservation of cauda epididymidal spermatozoa in the common ringtail possum (Pseudocheirus peregrinus)

Reproduction, Fertility, and Development
D J PhillipsStephen D Johnston

Abstract

The present study reports novel aspects of the reproductive biology of the male common ringtail possum (Pseudocheirus peregrinus). Plasma testosterone was measured through a stimulation test using the gonadotrophin-releasing hormone agonist, buserelin. Following intra-muscular administration of buserelin, there was an increase (P<0.05) in testosterone concentration in the peripheral circulation 4 h later. Quantitative testicular histology of this species was described for the first time. Eight stages of the seminiferous epithelium cycle were identified in 10 possums and their relative frequency determined. Spermatozoa were recovered from the cauda epididymides of hemi-castrated possums and cryopreservation conducted in straws (6 degrees C min(-1)) using final glycerol concentrations ranging between 2 and 20% in Tris-citrate egg yolk extender (v/v). Frozen straws were thawed and post-thaw motility, rate of motility, the percentage of live-dead spermatozoa and the percentage of sperm with swollen decondensed nuclei recorded. Similar to other marsupial sperm, common ringtail possum cauda epididymidal spermatozoa required high levels of glycerol (10-16%) in order to maintain post-thaw viability.

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Citations

Jun 1, 2011·Journal of Zoo and Wildlife Medicine : Official Publication of the American Association of Zoo Veterinarians·Gina M FerrieTammie Bettinger
Mar 14, 2013·Reproduction : the Official Journal of the Society for the Study of Fertility·Lindsay A HoganStephen D Johnston
May 12, 2009·Cryobiology·Yeng Peng ZeeStephen D Johnston
Oct 28, 2008·Theriogenology·John C RodgerStephen D Johnston
Dec 25, 2015·Journal of Veterinary Diagnostic Investigation : Official Publication of the American Association of Veterinary Laboratory Diagnosticians, Inc·Katherine M GrahamCatharine J Wheaton
Jun 26, 2008·Reproduction, Fertility, and Development·Camryn D AllenStephen D Johnston
Mar 2, 2010·Reproduction, Fertility, and Development·N A Czarny, J C Rodger

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