The present study examined the ovarian progesterone levels in rats during the normal 5-day oestrous cycle and in rats with an experimentally induced delayed or advanced ovulation. Ovarian androgen and oestrogen concentrations were also studied in rats with an advanced ovulation.
The ovarian progesterone concentrations during the normal cycle showed two peaks: one during metoestrus and dioestrus 1 and the second during the afternoon of pro-oestrus.
Rats treated with pentobarbitone sodium (35 mg/kg body weight) at 13.00 h on the day of pro-oestrus showed no increase in ovarian progesterone levels on that day, but did show an increase during the afternoon of the next day.
Rats injected intraperitoneally with an ovulation-inducing bolus of human chorionic gonadotrophin (hCG; 20 i.u.) at 15.00 h on the day before pro-oestrus (dioestrus 2) showed increased ovarian progesterone levels as early as 0·5 h after hCG injection. Lowered levels of ovarian androgen and oestrogen values compared with saline-injected rats were first found 2 and 6 h respectively after hCG injection.
In conjunction with data obtained previously these findings show that normal, delayed and advanced ovulations are preceded by an increase in ovarian progesterone concentrations and a subsequent decline in ovarian androgen and oestrogen levels.
Journal of Endocrinology is committed to supporting researchers in demonstrating the impact of their articles published in the journal.
The two types of article metrics we measure are (i) more traditional full-text views and pdf downloads, and (ii) Altmetric data, which shows the wider impact of articles in a range of non-traditional sources, such as social media.
More information is on the Reasons to publish page.
| Sept 2018 onwards | Past Year | Past 30 Days | |
|---|---|---|---|
| Full Text Views | 1 | 1 | 0 |
| PDF Downloads | 3 | 1 | 0 |
Online ISSN: 1479-6805
Print ISSN: 0022-0795
Strengthening biomedical communities
to advance science and health
CONTACT US
Bioscientifica Ltd | Starling House | 1600 Bristol Parkway North | Bristol BS34 8YU | UK
Bioscientifica Ltd | Registered in England no 3190519
