The occurrence of parthenogenetic activation is a major hurdle in obtaining sperm chromosome metaphases after heterospecific intracytoplasmic sperm injection (ICSI) of golden hamster oocytes with human spermatozoa. We addressed two potential contributors to parthenogenetic activation namely, post-ovulatory age of the oocyte and Ca2+ content of the injection medium. In serial experiments, hamste...

The golden hamster is a well-established model system for studies of morphology, reproductive physiology, oncology, genetics and virology. The aim of this study was to establish experimental protocols necessary for cloning the golden hamster; we examined and optimized conditions for parthenogenesis and cleavage of its oocytes. We tested oocytes of different ages, including 15 h after Human chor...

Background: Due to the seasonality reproduction of albino hamster (April to October in the Northern Hemisphere) and the need to produce blastocysts for research applications, producing and collecting blastocysts by natural mating in non-breeding season is complex in this species. In the present study in vivo blastocysts production and collection using super-ovulation and intrauterine inseminati...

INTRODUCTION During mammalian ovarian organogenesis, the massive loss of oogonia via apoptosis is attenuated by the association of germ cells with somatic mesoepithelial cells of the gonadal ridge to form primordial follicles. It is suspected that the germ cell actively participates in this process via the production of local regulatory factors. Growth differentiation factor-9 (GDF-9), a member...

a six month old male hamster living in a colony of hamster in the animal house of urmia university, urmia, iran, was found with restlessness and circling signs. the clinical examination revealed symptoms and signs of encephalitis. therefore microbiological and histopathologic studies were conducted after euthanizing the animal. finally, the results of laboratory tests demonstrated listeria mono...

Previous research has shown that oocyte cumulus complex (OCC) pickup rate is inhibited in hamsters when oviducts and OCCs are simultaneously exposed to cigarette smoke solutions, independent of any effect on ciliary beat frequency. The purpose of this research was to determine whether smoke solutions caused a change in adhesion between the OCC and infundibulum of the oviduct and to determine wh...

Os hamster são pequenos mamíferos da ordem Rodentia. São comumente adotados como animais de companhia principalmente devido ao seu tamanho, aparência e docilidade, juntamente com outros roedores. Uma das espécies mais comuns no mercado pet é o hamster-sírio (Mesocricetus auratus), criado em cativeiro hábitos crepusculares solitários. A popularização dos roedores exóticos companhia, eleva a dema...

A 2-year-old multiparous (Case 1) and a 2.5-year-old nulliparous 2) Djungarian hamster each presented with history of prolapsed mass from the vulva. partial uterine prolapse was diagnosed in both cases, according to clinical diagnostic examinations. The replaced hamster, an ovariohysterectomy performed. histopathological examination removed tissues revealed cyst papillary hyperplasia ovary. Thi...