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Oestrous Cycle - Anatomy & Physiology (view source)
Revision as of 11:35, 11 September 2008
, 11:35, 11 September 2008→Endocrine Changes during the Oestrous Cycle
=== Endocrine Changes during the Oestrous Cycle ===
=== Endocrine Changes during the Oestrous Cycle ===
* Oestrogens start to rise at the time of corpora lutea regression.
* Oestrogens reach a peak about 48 hours before the onset of oestrus.
* The ovulatory LH surge occurs at the start of oestrus, 8-15 hours after the peak in oestrogen.
* LH concentrations remain low and fluctuate throughout the rest of the cycle.
* FSH value vary considerably, but there are two surges.
** One surge is concurrent with the LH peak.
** A larger surge occurs on dat 23 of the cycle.
* Progesterone concentrations closely follow changes of the corpora lutea.
** In the first 8 days post-ovulation, there is good correlation between progesterone concentrations and the number of corpora lutea present.
** By day 12 post-ovulation, the correlation is less obvious.
* There are two surges of prolactin.
** One surge occurs at the same time as the LH and oestrogen surge.
** A second surge occurs during oestrus.
= Links =
= Links =
[[Oestrous_Cycle_-Pharmacological_Manipulation_of_Oestrous_Cycles_-_Anatomy_%26_Physiology|Pharmacological Manipulation of Oestrous Cycles]]
[[Oestrous_Cycle_-Pharmacological_Manipulation_of_Oestrous_Cycles_-_Anatomy_%26_Physiology|Pharmacological Manipulation of Oestrous Cycles]]