The objective of research was to determine the sensitivity, specificity and positive predictive value of serum follicle stimulating hormone and testis size in predicting spermatogenesis in infertile men with azoospermia. In a prospective study, azoospermic men were studied. Serum follicle stimulating hormone measurement and scrotal sac ultrasonography were performed. Bilateral testis biopsy was...

Data was collected on secondary:primary follicle ratio, relative follicle density, and seasonal changes in fibre cross-sectional area and fibre ellipticity (ratio of major-to-minor fibre cross-sectional axis) in the Australasian specialty carpet wool breeds (Carpetmaster, Drysdale, Elliottdale, Tukidale), Romneys and Merinos. Merinos had a higher secondary:primary follicle ratio (p<0.001), rela...

Changes in follicular and luteal structures were assessed and concentrations of estradiol and progesterone were measured in 13 Hereford X Angus suckled beef cows during resumption of estrous cycles. Transrectal ultrasonography was used to monitor follicular size, ovulation, and formation and regression of the corpus luteum (CL). The interval from parturition to first postpartum ovulation (FO) w...

BACKGROUND Ovarian response to gonadotrophin stimulation is monitored with serial ultrasound (US) examinations. Sonography-based Automated Volume Count (SonoAVC) is a relatively new three-dimensional (3D) US technology, which automatically generates a set of measurements including the mean follicular diameter (MFD) and a volume-based diameter (d(V)) for each follicle in the ovaries. The present...

Through the use of parabiosis in mice, aging-related deterioration of skeletal muscle and liver has been linked to a loss of systemic factors that support adult stem or progenitor cell activity. Since aging-related ovarian failure has recently been attributed, at least in part, to a loss of de-novo oocyte-containing follicle formation associated with declining oogonial stem cell activity, herei...

The objectives of this research were to partition variation in ovulatory follicle size into genetic and nongenetic components and to assess the utility of ovulatory follicle size as an indicator trait associated with reproductive success in beef cattle. Data were collected during the years 2002 to 2005 from 780 beef females that ranged in age from 1 to 12 yr (mean of 2.4 observations per female...

The aim of the present study in beef cattle was to investigate potential differences in follicle size and follicle wall-blood flow between cows and heifers and to compare follicle wall-blood flow between smaller and larger follicles. Cows and heifers were treated with a synchronization protocol and follicles and CLs were measured and evaluated for blood flow. Pregnancy diagnosis was performed o...

Background: One of the key questions in biochemistry is why cell becomes aged and what are the involved factors? Why cell growth is stopped after some divisions and cells become senescent? This occurs in a greater frame in the whole body and cells dye after a while. Androgenetic alopecia (AGA) is characterized by a loss or decrease in hair follicle size, which could be related to the loss of ha...

Introduction Figure 1 summarizes some key aspects of the bovine estrous cycle. Changes in the 2 key structures on the ovary, the preovulatory follicle and the corpus luteum, are emphasized in this figure. The function of 4 important hormones is also summarized in this figure. Estradiol-17ß from the preovulatory follicle causes the cow to manifest estrus behaviour and have an LH surge. The LH su...