Introduction: Genital system is important herd in animal's creation. It is necessary for animal reproduction. Mammal has two sex in genital system such as male and female in separated animals. Animal reproduction destroyed by disorder of genital system. In this case, animals cannot produce an animal similar to them. Finally it cause overthrow a species of animals. Methods: Histomorpholog...

introduction: genital system is important herd in animal's creation. it is necessary for animal reproduction. mammal has two sex in genital system such as male and female in separated animals. animal reproduction destroyed by disorder of genital system. in this case, animals cannot produce an animal similar to them. finally it cause overthrow a species of animals. methods: histomorphologic...

background: irradiation is one of the major causes of induced sperm dna damage. various studies suggested a relation between sperm dna damage and fertilization rate after intra-cytoplasmic sperm injection (icsi). objective: in this study, fertilization rate and premature chromosome condensation (pcc) formation after icsi of hamster oocytes with irradiated sperms from normal and oligosperm indiv...

BACKGROUND Laboratory animals are commonly used for evaluating the physiological properties of the mammalian ovarian follicle and the enclosed oocyte. The use of different species to determine the morphological relationship between the follicle and oocyte has led to a recognizable pattern of follicular stages, but differences in follicle size, oocyte diameter and granulosa cell proliferation ar...

The mouse oocyte can be activated by injection of a single, intact mouse spermatozoon or its isolated head. Isolated tails are unable to activate the oocyte. Active sperm-borne oocyte-activating factor(s) (SOAF) appears during transformation of the round spermatid into the spermatozoon. The action of SOAF is not highly species-specific: mouse oocytes are activated by injection of spermatozoa fr...

Fragments of 40 ovaries of various laboratory mammals, including mice, golden hamsters, rabbits and ferrets have been studied. The structures described in this paper were observed in some of the oocytes in the 14-day-old golden hamster ovary. The specimens in which they were present were obtained from 4 animals. After fixation for 60 min in chilled, buffered osmium tetroxide, the blocks were de...

The golden hamster is an attractive model organism for studying reproductive physiology, oncology, genetics and virology. In an effort to establish experimental protocols necessary for cloning golden hamsters, we examined changes in the reciprocal position of the FPB (first polar body) and chromosome set of MII (the second meiotic metaphase) oocytes of golden hamsters. Oocytes were collected un...

Magnetic cell sorting (MACS) using annexin V-conjugated microbeads eliminates apoptotic spermatozoa based on the externalization of phosphatidylserine residues. The procedure delivers two sperm fractions: annexin V-negative (nonapoptotic) and annexin V-positive (apoptotic). Our aim was to determine whether the sperm fertilizing potential can be improved by selecting a nonapoptotic fraction usin...

Electroejaculate traits and circulating follicle-stimulating hormone (FSH), luteinizing hormone (LH), and testosterone concentrations were analyzed in adult leopard cats (Felis bengalensis), a rare felid species indigenous to east Asia. The ability of leopard cat sperm to bind and penetrate zona-free hamster ova and zona-intact domestic cat oocytes in vitro was examined as a means of testing sp...