4,503
edits
Changes
Normal Parturition - Anatomy & Physiology (view source)
Revision as of 11:20, 4 August 2008
, 11:20, 4 August 2008→Stage 2
=== Stage 2 ===
=== Stage 2 ===
* Abrupt onset
* Appearance of the amnion or commencement of forceful straining
** Not much delay between them, often coincide.
* Soon after straining begins, the mare goes down.
* Lies on her side with the limbs extended
** Generally remains in this position until the foal is born.
* Transperent blue/white 'water bag' (amnion) visible at the vulva
* Quickly followed by the appearance in it of a digit.
* Straining at regular intervals.
** Each comprises 3/4 powerful expulsive efforts followed by a period of rest.
** Generally 3 minutes long
* One forelimb procedes the other by 7-8cm
** One elbow passes through the pelvic inlet before the other preventing minimal obstruction.
* Head is usually in the oblique position, but may be transverse with the cheek lying on the limbs.
* Greates and longest effort is with birth of the head.
* After expulsion of the foal, the mare may remain on her side exhausted for up to 30 minutes.
* Umbillical cord is intact when the foal is born.
** Subsequently ruptures 5-8cm below the belly due to movement of the mare or foal.
=== Stage 3 ===
=== Stage 3 ===