Open Access Repository

Seasonal variations in reproductive hormones of free-ranging echidnas (Tachyglossus aculeatus): interaction between reproduction and hibernation

Downloads

Downloads per month over past year

Nicol, SC, Andersen, NA and Jones, SM 2005 , 'Seasonal variations in reproductive hormones of free-ranging echidnas (Tachyglossus aculeatus): interaction between reproduction and hibernation' , General and Comparative Endocrinology, vol. 144 , pp. 204-210 , doi: 10.1016/j.ygcen.2005.05.013.

[img] PDF
Nicol_et_al...pdf | Request a copy
Full text restricted
Available under University of Tasmania Standard License.

Abstract

We measured the reproductive steroids testosterone and progesterone in free-ranging adult echidnas over several years. For months other than June - August the mean progesterone concentration was 0.18 plus or minus 0.12 ng ml-1 (n=14), and all blood samples taken from active female echidnas in June - August had progesterone concentrations above 0.5 ng ml-1. The highest progesterone value measured was 13.4 ng ml-1 in a pregnant female several days before egg-laying. For months other than June - August the mean testosterone concentration was 0.09 plus or minus 0.05 ng ml-1 (n=13). During June - August all active sexually mature males had testosterone concentrations in excess of 0.2 ng ml-1 and were found in mating groups at some time during this period. The highest plasma testosterone concentration measured was 4.62 ng ml-1.

Item Type: Article
Authors/Creators:Nicol, SC and Andersen, NA and Jones, SM
Keywords: Monotreme, echidna, reproduction, testosterone, progesterone, hibernation
Journal or Publication Title: General and Comparative Endocrinology
ISSN: ISSN: 0016-6480
DOI / ID Number: 10.1016/j.ygcen.2005.05.013
Item Statistics: View statistics for this item

Actions (login required)

Item Control Page Item Control Page
TOP