Recent innovations in ultrasonographic techniques have advanced our knowledge on the effects of seasonality on the changing populations of antral follicles in mares. The seasonal patterns in the monthly incidence of ovulations is at least partly a function of daylength, even at latitudes as low as 10o where the longest day may be less than 13 hours. Follicle dynamics involves a mid-anovulatory ...

This study investigated the effect of GnRH analogues on inducing ovulation of dominant follicle (DF)and subsequent corpus luteum (CL) lifespan in the presence of norgestomet implant in Holstein heifers. Onday 6 to 8 of the estrous cycle (day 0 of the experiment), all heifers (n=15) received norgestomet implantfollowed by prostaglandin injection on days 0 and 1. On day 4, group 1 (n=4) and 2 (n=...

Background Intrauterine insemination (IUI) is a primary, simple and effective method of infertility treatment. The aim of this study was to determine the success rate of IUI and some related male and female factors. MaterialsAndMethods This quasi - experimental study was done on 500 infertile couples from 2006 to 2008. Either clomiphene or human menopausal gonadotropin (HMG) alone or clomiphene...

The Fas antigen (Fas) is a cell surface receptor that may be involved in the initiation and progression of follicle cell apoptosis during atresia. Fas initiates apoptosis in sensitive cells after binding Fas ligand (FasL). Other experiments have shown that expression of Fas mRNA and responsiveness to Fas-mediated apoptosis vary in bovine granulosa and theca cells during follicle development. In...

The objective of this study was to elucidate ovarian follicular dynamics in swamp buffalo cows (Bubalus bulalis) following a protocol for estrus synchronization during hot as low breeding season (March to June) and cool as high breeding season (November to February). Nine pluriparous buffalo cows received a progesterone ear implant for 10 days together with the administration of a luteolytic do...

Secretion of adequate levels of progesterone from a proper corpus luteum (CL), which develops out of the cells of a healthy preovulatory follicle, is a key-factor for establishment of a pregnancy. The aim of this study was to investigate the relationship between morphological and secretory characteristics of preovulatory follicles and their corresponding corpus luteum with regard to the post-pa...