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::[[Gestation -Histotrophic Exchange - Anatomy & Physiology|Histotrophic]]
 
::[[Gestation -Histotrophic Exchange - Anatomy & Physiology|Histotrophic]]
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* Nutrition supplied by uterine secretions/debris - 'Uterine milk'
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* Often maintained by '''progesterone'''
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* Nourishment of the embryo '''before implantation''' when there is no established placenta.
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* Maintained for long period of time in ungulates, since implantation is late
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** Horse: day 35
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** Ruminants: day 15-20
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* '''Pig and horse''': pinocytosis persists via '''areolae'''
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* '''Sheep,cow,dog and cat''': pinocytosis persists via '''haemophagous zones''' that break down and release iron to the placenta.
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::[[Gestation -Haemotrophic Exchange - Anatomy & Physiology|Haemotrophic]]
 
::[[Gestation -Haemotrophic Exchange - Anatomy & Physiology|Haemotrophic]]
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