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The Artiodactyla have a cotyledonary placenta. In this form of placenta, the chorionic villi form a number of separate circular structures (cotyledons) which are distributed over the surface of the chorionic sac. Sheep, goats and cattle have between 72 and 125 cotyledons whereas deer have 4-6 larger cotyledons. [1] [2]
For more information about the ritual consumption of placenta see Placenta: Society and culture. Human and animal placentas are also used as a source of extracts for ingredients in various consumer products such as pharmaceuticals, cosmetics, hair care products, health tonics, and food products other than ritual consumption by the mother or family.
However, the concept is becoming more popular among women in the West, despite its controversial overtone. [1] Theories as to why mammals engage in placentophagy are related to the many proposed benefits of placental consumption. These vary between animals but tend to be behavioural, medical or spiritual in nature. [2] [3] [4]
A system of blood and blood vessels now develops at the point of the newly forming placenta, growing near the implantation site. The small sac inside the blastocyst begins producing red blood cells. For the next 24 hours, connective tissue develops between the developing placenta and the growing embryo. This later develops into the umbilical cord.
The placenta has high protein, rich iron and nutrient content, but there is inconclusive scientific evidence about any health benefit to its consumption. [5] The risks of human placentophagy are also still unclear, [ 6 ] but there has been one confirmed case of an infant needing hospitalization due to a group B strep blood infection tied to ...
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The class Mammalia is divided into two subclasses based on reproductive techniques: monotremes, which lay eggs, and therians, mammals which give live birth, which has two infraclasses: marsupials/metatherians and placentals/eutherians.
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