On the day of ovulation and next on day 7 after ovulation the ovaries of 20 sheep were examined using the transrectal ultrasound method. To verify the results, similar examination was made with the laparoscopic method. Depending on the stage of the sexual cycle (day 1 vs day 7) the number of Graafian follicles (∅ ≥5 mm) was determined as well as the total number of corpora lutea found in both o...

In non-pregnant goats, appreciable amounts of testosterone (2.1 ng/g) and 5 alpha-dihydrotestosterone (DHT, 0.8 ng/g) were present in the corpus luteum on Day 12 of the oestrous cycle. Significant (P less than 0.01, N = 18) veno-arterial concentration differences of testosterone were found across ovaries bearing corpora lutea. No such difference in testosterone concentration occurred across ova...

The distribution of androgen receptor (AR) and cytochrome P450 aromatase was investigated in paraffin sections of pregnant pig ovary. Ovarian follicles and corpora lutea were isolated from ovaries obtained on Days 10, 18, 32, 71 and 90 post coitum (p.c.). Androgen receptor was localized in the nuclei of granulosa cells of follicles of various sizes. In addition, some follicles demonstrated stai...

The objective of the present study was to characterize changes in growth, concentrations of steroids in follicular fluid (FF) and gonadot ropin receptors of individual antral follicles after spontaneous luteolysis in heifers and to reexamine our hormonal method of classifying healthy and atretic follicles. Groups of heifers were ovariectomized (OVX) before regression of corpora lutea on d 17, 1...

The constituent cell types of the ovary of the porcupine were similar to those of New World hystricomorph rodents and accessory corpora lutea and luteal bodies were formed through the luteinization of the membrana granulosa or theca interna of antral follicles. All luteal bodies were histologically similar. The total volume of luteal tissue per female was not affected by fetal age and was unrel...

The aim of this work was to study the influence of hypokinetic conditions on the ovary and corpus luteum of pregnant rats. The rats were kept in hypokinetic conditions for 5 days in the period between the 13th and 18th days of pregnancy. A three-dimensional reconstruction of the ovary and corpora lutea and also a stereological evaluation of the luteal cells and their nuclei were performed using...