چرخه اووژنز در مار آبي Natrix natrix در استان مازندران

The study of oogenesis cycle of Grass Snake(Afa*ra: matrix) in Mazandaran province

The grass snake {Natrix matrix) is one of non venomous snakes of Colubridae family is founded in northern provinces of Iran. This research was conducted in order to study the reproductive cycle of grass snake {Natrix natrix) in Mazandaran province during year of 2007.Sampling period was April to middle of November and 76 grass snake were gathered by hand and net from the Abandansar fish raising lake station, Zare forest Rice farms of Sari suburb and Taj an river. In order to study the oogenesis stages oviducts were extracted from the samples and probed by histological studies. The mean of female length was 694.59 mm. Results indicated that oogenesis commencement were in early June and ended in early August. The mean of eggʹs weight and volume was 5.816g and 29031.87mm3 respectively. The results of studies on ovary show that the means of right and left ovum number in ovary were 11 and 9 respectively. The mean of number and volume of grown ovums was 4.12 and 6654.08mm3 for right ovary and 3.87 and 7221.84 mm3 for left one. The ovums weight mean of right and left ovary was 1.71 and 1.94g respectively.