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Vertebrate reproductive science and technology
RESEARCH ARTICLE

A superovulation protocol for the spiny mouse (Acomys cahirinus)

Rachael Pasco A , David K. Gardner B , David W. Walker A and Hayley Dickinson A C
+ Author Affiliations
- Author Affiliations

A The Ritchie Centre, Monash Institute of Medical Research, Monash University,Clayton, Vic. 3168, Australia.

B Department of Zoology, The University of Melbourne, Melbourne, Vic. 3010, Australia.

C Corresponding author. Email: hayley.dickinson@monash.edu

Reproduction, Fertility and Development 24(8) 1117-1122 https://doi.org/10.1071/RD12044
Submitted: 16 February 2012  Accepted: 9 March 2012   Published: 24 April 2012

Abstract

This study aimed to develop a superovulation protocol for the spiny mouse (Acomys cahirinus). The spiny mouse is a desert-adapted rodent species, with a long oestrus cycle (11 days) compared with rat and mouse, and gives birth to few (mean litter size is 3) precocial offspring after a relatively long gestation (39 days). We successfully optimised a superovulation protocol that elicited a 5-fold increase in the normal ovulation rate of this species. To induce superovulation in the spiny mouse 2 injections of equine chorionic gonadotrophin (eCG, 10 IU each), 9 h apart, were required, followed by 20 IU of human chorionic gonadotrophin (hCG). This protocol was successful in 100% of females trialed and at 33 h post-hCG an average of 14.7 ± 1.5, 1–2 cell embryos were recovered. Histological analysis of ovaries following superovulation revealed large corpus lutea and post-ovulatory follicles occupying a large part of the ovary. Ovulation commenced 6–12 h after the hCG injection and continued until 24–33 h post-hCG as indicated by both histological analysis of ovaries and the presence of oocytes/embryos in the oviduct. This superovulation protocol will facilitate the development of an in vitro culture system for spiny mouse embryos.

Additional keywords: eCG, embryo, hCG, ovary, ovulation.


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