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Oestrous Cycle - Anatomy & Physiology (view source)
Revision as of 14:18, 10 September 2008
, 14:18, 10 September 2008→Size of Ovaries
==== Size of Ovaries ====
==== Size of Ovaries ====
* Depends on the phase of the oestrous cycle and whether it contains an active corpus luteum.
* The presence of follicles does not alter the size of the ovary to anything like the extent of the corpus luteum.
* In the majority of heifers and young cows examined between day 6-18 of dioestrus, one ovary will be larger than the other.
* The larger ovary will be approximately:
** 3.5cm pole-pole
** 3cm from the attached side to the free border
** 2.8cm from side to side
** The corpus luteum will project from some point on the surface.
* The smaller ovary will be approximately:
** 2.5cm pole-pole
** 1.5cm from the attached side to the free border
** 1.2 cm from side to side
* During the 4-5 days after oestrus, the developing corpus luteum has not attained sufficient bulk to influence the size of the ovary significantly and the regressing corpus luteum has lost significant bulk.
* During oestrus there will also be little difference in size.
** If the ovary undergoing enlargement of a dominant follicle also contains a regressing corpus luteum, it will be a little larger than the other ovary but not strikingly so.
==== Ovaries in a Multiparous Cow ====
==== Ovaries in a Multiparous Cow ====