shirbot ( barbus grypus ) is one of the species in south and southwest of iran which is greatly favorable to residents of the region. unfavorable ecological conditions in habitat of this species and overfishing have led to the reduction of the population of shirbot. therefore, to restore the natural stock of this species, identifying its reproductive cycle associated with its habitat is of a gr...

to describe the morphological and histological changes during the annual reproductive cycle of the gonads of cyprinion tenuiradius, a total of 341 specimens (102 female and 235 male specimens) were collected monthly from the rudbal river (in the qarah aghaj sub-basin, the persian gulf basin), firuzabad, fars province, southern iran. the randomly sampling was adequate to collect males and female...

the spotted toad-headed agama, phrynocephalus maculatus, is a member of the agamidae family distributed in the central and south-eastern deserts of iran. iranian specimens are rare in collections. in this research, the female reproductive cycle of this species was studied from april 5 to august 5, 2013. totally, 15 adult females were collected by hand at midday from southern parts of damghan co...

Over the last century the reproduction of sturgeon has been intensively studied par Russian scientists who established a technology for the ranching of alevins which included artificial fertilization of gametes taken from wild broodfish and larvae rearing. More recently, since 1970, major contributions originated from teams in the USA, the EU, Japan and Iran. A rather good knowledge of the repr...

Over the last century the reproduction of sturgeon has been intensively studied par Russian scientists who established a technology for the ranching of alevins which included artificial fertilization of gametes taken from wild broodfish and larvae rearing. More recently, since 1970, major contributions originated from teams in the USA, the EU, Japan and Iran. A rather good knowledge of the repr...

Background: Rodents with short reproductive cycle length are the best model for investigation of physiology and molecular aspects of reproductive biology. This study aimed to establish a correlation between histological changes of uterus and ovaries with the vaginal smear. Materials and Methods: 6-8 weeks old virgin Female NMRI mice were submitted to the vaginal smear collection and observed us...

Speciation, the process by which new biological species arise, involves the evolution of reproductive barriers, such as hybrid sterility or inviability between populations. However, identifying hybrid incompatibility genes remains a key obstacle in understanding the molecular basis of reproductive isolation. We devised a genomic screen, which identified a cell cycle-regulation gene as the cause...

THE IDEA that by activating the hypothalamic-pituitary-adrenal (HPA) axis, stress and overt or latent psychological disturbances have the potential of inhibiting the hypothalamic-pituitary-gonadal (HPG) axis has been circulated for a long time (1). It is generally thought that, if severe enough, this condition may lead to the suppression of the normal menstrual cycle in a syndrome referred to a...