Changes

:'''Large litter''' overstretching the uterus

:'''Large litter''' overstretching the uterus

:'''Small litter''' not stimulating the uterus enough. Small foetuses cannot apply enough pressure on the uterine wall and cervix to set up the [[Parturition Endocrine Control - Anatomy & Physiology|Fergusson reflex]].

:'''Small litter''' not stimulating the uterus enough. Small foetuses cannot apply enough pressure on the uterine wall and cervix to set up the [[Parturition Endocrine Control - Anatomy & Physiology|Fergusson reflex]].

:'''Systemic disease''': Obesity and lack of excercise, hypocalcaemia, septicaemia.  

:'''Systemic disease''': Obesity and lack of exercise, [[hypocalcaemia]], septicaemia.  

Complete primary uterine inertia occurs if '''2nd stage labour''' does not begin. Partial inertia occurs if the 2nd stage begins but contractions soon fail.

Complete primary uterine inertia occurs if '''2nd stage labour''' does not begin. Partial inertia occurs if the 2nd stage begins but contractions soon fail.

== Secondary Uterine Inertia ==

== Secondary Uterine Inertia ==

Uterine muscles become '''exhausted after prolonged contractio'''n against an obstructing or oversized foetus or during birth of a large litter. There is usually subclinical '''hypocalcaemia and/or hypoglycaemia'''.

Uterine muscles become '''exhausted after prolonged contraction''' against an obstructing or oversized foetus or during birth of a large litter. There is usually subclinical '''hypocalcaemia and/or hypoglycaemia'''.

This can occur in the sow, bitch and guinea pig.

This can occur in the sow, bitch and guinea pig.