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Oestrous Cycle - Anatomy & Physiology (view source)
Revision as of 14:36, 10 September 2008
, 14:36, 10 September 2008→Ovaries in a Multiparous Cow
==== Ovaries in a Multiparous Cow ====
==== Ovaries in a Multiparous Cow ====
* Larger
* Partly due to progressive deposition of scar tissue from prolonged function.
* Can be due to large numbers of small, but visible follicles.
* Often, the ovary that does not contain a corpus luteum measures:
** 4cm pole-pole
** 3cm from the fixed edge to the free border
** 2cm from side to side
* In mid-dioestrus it is still possible to detect the corpus luteum because, aside from its protrusion, the ovary appears plump. The ovary that does not contain a corpus luteum is flattened from side to side.
* Corpora lutea (active and regressing) and follicles approaching maturity are the same as those in the heifer.
* In addition, however, there are old scarred corpora lutea of previous pregnancies.
** Generally white (corpus albicans - latin for white body), pin-head sized projections on the surface of the ovary.
** Contain mainly scar tissue
** Irregular outline
** Maximum of 0.5 cm
* The corpus luteum of pregnancy does not atrophy as quickly after parturition as the corpus luteum of the cycle. It becomes invaded by scar tissue and remains throughout the cow's life.
* The fully developed corpus luteum is present by day 7 and persists unchanged until the onset of pro-oestrus at day 19-20.
= 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]]