Ovarian suppression in a marsupial following single treatment with a gonadotrophin-releasing hormone agonist in microspheres
Ryan Robert Witt A C , Ian Ross Forbes A , John McBain B and John Cameron Rodger A
+ Author Affiliations
- Author Affiliations
A School of Environmental and Life Sciences, The University of Newcastle, University Drive, Callaghan, NSW 2308, Australia.
B Melbourne IVF, 344 Victoria Parade, East Melbourne, Vic. 3002, Australia.
C Corresponding author. Email: ryan.witt@uon.edu.au
Reproduction, Fertility and Development 28(12) 1964-1973 https://doi.org/10.1071/RD14423
Submitted: 4 November 2014 Accepted: 29 May 2015 Published: 30 June 2015
Abstract
The effect of treatment with Lucrin Depot (1 month), a microsphere gonadotrophin-releasing hormone agonist preparation, was investigated in the fat-tailed dunnart (Sminthopsis crassicaudata) as a potential strategy to synchronise cycling. The status of the ovaries (ovarian size, number and size of Graafian follicles and corpora lutea) and reproductive tract (weight, vascularity and muscularity) in twelve untreated females were assessed to establish the activity parameters for randomly selected cycling animals. Thirty-six females were treated with 1 mg kg–1 (n = 12), 10 mg kg–1 (n = 12) or 20 mg kg–1 (n = 12) Lucrin Depot. At 4, 6 and 8 weeks the reproductive tracts were assessed using the criteria developed in the untreated females. All of the females treated with 10 mg kg–1 showed suppression at 4 weeks and 25% showed return of reproductive activity at 8 weeks. A dose of 1 mg kg–1 did not appear to suppress reproductive activity and 20 mg kg–1 gave equivocal results, with evidence of both suppression and activity. The results indicate that Lucrin Depot appears to be a promising agent to regulate and potentially synchronise breeding activity in the fat-tailed dunnart.
Additional keywords: dasyurid, dunnart, fertility control, leuprorelin acetate, synchronisation.
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