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Hippomanes
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Hippomanes ( ἱππομανές) are brownish or olive-greenish, elastic formations that arise physiologically in female bovines and equines during pregnancy.


Formation
The up to fist-sized hippomanes are either attached to the membrane or swim freely in the allantoic fluid. Occasionally such formations also occur in (cows, sheep, goat) and . Similar formations have also been found in , and , but the objects found in the and are distinguishable. This has caused the confusion over the word "hippomanes" in scientific literature, with propositions to use it only for objects found in Equidae pregnancies.

Hippomanes arise from unconsumed and thickened nutrient fluid (histiotrophe) of the placenta, in concentric layers around the centre of allantoic calculi of tissue debris. The chemical composition is different to amniotic fluid, which along with the insolubility suggests that it's not a result of a simple precipitation process, but a denatured mucoprotein complex.

Hippomanes first appear in pregnant horses and ca. 85 days from conception, earlier there are small white flecks of tissue debris instead. The changes in hippomanes' color correspond to changes in color of allantoic fluid. They are often surrounded by shed cells.


History
Hippomanes was first named and described in Ancient Greece, with the name literally meaning "horse madness". It was used as an aphrodisiac in .Pliny the Elder Naturalis historia 8, 165 Solinus 45, 17 6, 133 Aen. 4, 515 One of the first written mentions is Aristotle describing the hippomanes circa 350BC. According to Pliny the Elder,Plinius Naturalis historia 8,66 (165). the Hippomanes, which are said to be found as tough bodies on the forehead of the newborn foal, are eaten by the mare immediately after birth. If the mare was prevented from doing so, she would feel no affection for the foal and refuse to feed it, which is why it was believed that the power of love was concentrated in the hippomanes.

The vulval discharge from the mare in was also referred to as Hippomanes in antiquity and was used equally for love potions and love spells. Book II.4:58, Elegies Book IV.5:18

In a Greek mythology tale, , the son of , is devoured by his horses at the funeral games for , the father of , during the chariot race, because had driven them wild with Hippomanes.Vergil Georgica 3,267Hyginus Fab. 250

Later hippomanes has been described and used by .

A hippomane is commonly referred to among horsemen as 'foal's bread'. Its appearance at the birth of a foal (sometimes in its mouth) is regarded as a symbol of good luck. When dried, a 'foal's bread' takes the shape of a tough, leathery heart.


See also
  • Foal's Bread, 2011 Australian novel about showjumping

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