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http://dx.doi.org/10.13047/KJEE.2014.28.3.287

A Study on the Ovarian Cycle of Korean Brown Frog (Rana coreana)  

Shin, Jung-Min (Dept. of Biology, Graduate school of Honam Univ.)
Ko, Sun-Kun (Dept. of Biology, Honam Univ.)
Publication Information
Korean Journal of Environment and Ecology / v.28, no.3, 2014 , pp. 287-292 More about this Journal
Abstract
In order to determine the ovarian cycle of Korean brown frog, Rana coreana, the developmental stage based on the gonadosomatic index (GSI), size of follicle oocytes in ovary and vitellogenesis for adult females were investigated all around the year. The weight of ovary and GSI were the lowest from March to May, and all follicle oocytes existed in the pre-vitellogenic form, indicating that the vitellogenesis was suspended. The follicle oocytes in early-vitellogenic stage appeared in ovary during June when the weight of ovary and GSI started to increase, and the follicle oocytes in mid-vitellogenic and pre-vitellogenic stages existed during August and the weight of ovary and GSI also increased. This indicates that vitellogenesis has been carried out actively during this period. The follicle oocytes in mid-vitellogenic stage and late-vitellogenic stage when the vitellogenesis was also completed existed between September and November. Post-vitellogenic follicle oocytes after vitellogenesis started to appear from December in hibernation, and the full grown follicle oocytes existed during February, indicating the ovarian cycle that all follicle oocytes in ovary are developed separately, not synchronized, during the growing period of follicle oocytes and the post-vitellogenic follicle oocytes are maintained the ovulation period.
Keywords
GONADAL CYCLE; GSI; AMPHIBIAN;
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