Changes in the reciprocal position of the first polar body and oocyte chromosome set in golden hamsters.

Fungal flora of the hair coat of domestic golden hamster (Mesocricetus auratus) with and without skin lesions in Mashhad, Iran

The objective of this study was to investigate fungal flora of the hair coat of domestic golden hamsterswith and without skin lesions. Sixty hamsters were examined in the Small Animal Teaching Hospitalof the Faculty of Veterinary Medicine, Ferdowsi University of Mashhad, and Mashhad, Iran. Asteriletoothbrush was used for sample collection, from the entire body of the hamsters, all skin lesions ...

I-35: Polar Body Analysis by Array CGH Identifies Women with Varying Susceptibility to Aneuploidy and Suggests that Non-disjunction Is Not The Predominant Mechanism Leading to Aneuploidy in Humans

Background: The maternal age effect for trisomy is well known. However what is less established is whether certain women are more (or less) prone to segregation errors, independent of age. Trisomy arises primarily through maternal meiosis I chromosome segregation errors however the precise mechanism by which these errors occur is unclear. Current dogma attributes the origin of trisomy to malseg...

Evaluating the Role of First Polar Body Morphologyon Rates of Fertilization and Embryo Development inICSI Cycles

P-37: The Effect of Extracellular Calcium Concentration on the In vitro Maturation of Mouse Oocytes after Mechanical Stimulation by Hydrostatic Pressure

Background: Oocyte maturation is usually defined as the period of progression from the first to the second meiotic arrest and involves coordinated nuclear and cytoplasmic modification. Ca2+ signals are known as important regulators of oocyte maturation. Extracellular Ca2+ is important for first polar body formation, normal meiosis kinetics, and for preserving the chromosome and spindle configur...

I-18: The Role of Sex Chromosomes in Female Germ Cell Differentiation

Background When gonadal sex reversal occurs in mammalian species, the resultant XX males and XY females become infertile or subfertile, suggesting critical roles of sex chromosomes in germ cell differentiation. The objective of our study is to clarify the mechanism of infertility in the B6.YTIR (XY) sex-reversed female mouse, which can be attributed to a failure in the second meiotic division i...