We analyzed the localizatien ofsteroidogenic enzymes (P450 scc, 3 B HSD, P450 arorn and P450 c17) in the corpora lutea oftwo Hokkaido sika deer (Cervus nippon oresoensis) during the early mating season. Two corpora lutea were found in each female and the timing of formation of the corpora lutea seemed diflbrent. P450 scc, and 3 B HSD, positive luteal cells were fbund in both corpora lutea. The ...

We analyzed the localization of steroidogenic enzymes (P450 scc, 3 beta HSD, P450 arom and P450 c17) in the corpora lutea of two Hokkaido sika deer (Cervus nippon yesoensis) during the early mating season. Two corpora lutea were found in each female and the timing of formation of the corpora lutea seemed different. P450 scc, and 3 beta HSD, positive luteal cells were found in both corpora lutea...

Corpora lutea induced in pigs on Day 6 regressed with the naturally formed corpora lutea towards the end of the cycle. Hormonal induction of corpora lutea on Days 8, 10 or 16 significantly prolonged the cycle despite involution of the original corpora lutea about 16 days after ovulation. The interval between the exogenous administration of hcg and the appearance of the next oestrus varied with ...

A herd of sheep (40 heads) was divided into two equal groups: group 1 was kept under an overhead shelter and group 2 in a warm barn. The effect of maintenance on ewe’s reproductive performance, corpora lutea and corpora lutea of pregnancy rate, as well as the concentration of plasma progesterone and estradiol in peripheral blood was investigated. At the first laparoscopy fewer corpora lutea tha...

T HE effects of exogenous progesterone on the corpus luteum are quite variable. No gross or microscopic effects were apparent in the pregnant rat (Sammelwitz et al., 1956; Aldred et al., 1959) or rabbit (Ulberg, 1952). Selye (1939) reported no effect of progesterone on corpora lutea of late pregnancy in mice, but Burdick (1942) found that treatment begun one or two days post-mating caused lutea...

Ovaries were obtained from tammar wallabies at various stages of the reproductive cycle to examine the occurrence of oestrogens in corpora lutea, and the synthesis and metabolism of steroids in the corpus luteum and ovarian cortical and interstitial tissues. Corpora lutea contained oestradiol-17 beta and oestrone during embryonic diapause and at all stages of pregnancy studied after blastocyst ...

The lutropin-induced depletion of ascorbate in corpora lutea of albino-rat ovary is shown to be associated with the induction of peroxidase in corpora lutea. An inverse relationship between ascorbate depletion and peroxidase activity was established in a time-course study with lutropin. Analyses made at different phases of the reproductive cycle are in accord with this relationship. It is sugge...

Binding of 125I-human chorionic gonadotropin (HCG) to homogenates of the human corpora lutea of the menstrual cycle and pregnancy was examined in vitro. While corpora lutea of the menstrual cycle bound 125I-HCG specifically, the corpora lutea of pregnancy from 8 weeks' gestation bound little or none of the added 125I-HCG. In the corpus luteum of the menstrual cycle the dissociation constant for...

Hysterectomy on the 5th day of the luteal phase inhibited the dioestrous cycle for at least 8 months. The corpora lutea persisted throughout this period and, at the end, contained an appreciable amount of progesterone. Hysterectomy on the 10th day of the luteal phase caused the corpora lutea to enlarge as in pregnancy and to persist for a period about equal to that of gestation. Hysterectomy on...

ß-Carotene is present in extremely high concentrations in bovine corpus luteum. The aim of this study was to examine the extent of the seasonal variation in concentrations of luteal ß-carotene in cows. A total of 102 corpora lutea collected throughout all 12 months of the year were analysed by high performance liquid chromatography (HPLC). The mean ß-carotene concentration of the luteal tissues...