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Pregnancy and Parturition - Horse Anatomy (view source)
Revision as of 17:32, 26 November 2012
, 17:32, 26 November 2012→Histotrophic Exchange
===Exchange===
===Exchange===
The mare is not able to confer immunity via the placenta and instead relies on the passive transfer of antibodies via '''colostrum'''.
The mare is not able to confer immunity via the placenta and instead relies on the passive transfer of antibodies via '''colostrum'''.
===Histotrophic Exchange===
====Histotrophic Exchange====
This type of exhange facilitates nourishment of the embryo prior to implantation, i.e. where no placenta exists. In horses, this type of exchnage is very important as there is a long period prior to implantation (up to 35 days). Nutrition is supplied by uterine secretions/debris, often referred to as 'uterine milk'. Uterine milk secretions are usually maintained by '''progesterone'''. Pinocytosis (cellular drinking) is the main exchange mechanism.
This type of exhange facilitates nourishment of the embryo prior to implantation, i.e. where no placenta exists. In horses, this type of exchnage is very important as there is a long period prior to implantation (up to 35 days). Nutrition is supplied by uterine secretions/debris, often referred to as 'uterine milk'. Uterine milk secretions are usually maintained by '''progesterone'''. Pinocytosis (cellular drinking) is the main exchange mechanism.
====Haemotrophic Exchange====
This type of exchnage utilises direct transfer of nutrients from the maternal to foetal blood via simple diffusion, facillitated diffusion, active transport and complex diffusion.
==Parturition==
==Parturition==