Introduction and aims of the study: Some studies on sibling oocytes have shown that intracytoplasmic sperm injection (ICSI) obtains poorer results than conventional in vitro fertilization (cIVF) women with ovarian endometriosis, suggesting their could be particularly sensitive to some ICSI-induced mechanical damage. Aims this study were clarify (a) whether endometriosis induce peculiar fragilit...

Oocyte quality in pigs is defined as the potential of that oocyte to develop into a viable offspring. There is increasing evidence that the programming of the oocyte must be completed before leaving the ovarian follicle, including both nuclear and cytoplasmic maturation. Pig oocytes matured in vitro under basic conditions are deficient in some, as yet unidentified, cytoplasmic factors and thus ...

In the process of fertilization, most mammalian spermatozoa must penetrate through a series of egg investments before reaching the vitelline membrane. By contrast, cock spermatozoa have only to penetrate the vitelline membrane of the hen's ovum. The composition of the vitelline membrane of the hen's ovum at the time of ovulation has been described by Bellairs, Harkness & Harkness (1963) as a si...

BACKGROUND Most studies on granulosa cell (GC) function in cattle have been performed using GC and follicular fluid (FF) samples collected from slaughterhouse ovaries. Using this approach, the follicular developmental stage and functional status are unknown and indirectly inferred, limiting data interpretation. Ultrasound-guided follicle aspiration has previously been used to recover GC or FF s...

Eight ewes in each of four groups were injected subcutaneously immediately prior to natural mating with 0, 30, 150, or 750 /ag of estradiol-17/3. The ewes were necropsied 3 days after mating and the ova were examined. None of the three doses of estradiol reduced ovum fertilization significantly, but the 750-/ag dose decreased the number of accessory sperm ceils in the zonae pellucidae. Eight ot...

background: chromosomal disorders are the most common cause of first trimester spontaneous abortion. among the human chromosomes, chromosome no.9 was the most common structural chromosomal variant and it is not thought to be of any functional importance, which often considers as a normal variation in structural polymorphisms, nevertheless there are some studies which claim that there is an asso...

Abstract Investigation of cellular responses to thermal heat stress can lead identifying novel targets intervention tackle the increasing fertility decline due climate change-associated seasonal stress. We aimed study response granulosa cells Dry beef cows (n=11) were kept together during and subjected synchronization stimulation for follicular dynamics. Ovum pick-up (OPU) was conducted on all ...