Date: December 7, 2016
Source: Forschungsverbund Berlin e.V.
(FVB)
Human preferences for horse coat colors
have changed greatly over time and across cultures. Spotted and diluted horses
were more frequent from the beginning of domestication until the end of the
Roman Empire, whereas solid colors (bay, black and chestnut) were predominant
in the Middle Ages. These are the findings of an international research team
under the direction of the Leibniz Institute for Zoo and Wildlife Research
(IZW). The results have just been published in the open access journal
Scientific Reports.
The study reveals that the diversity of
coat colors in horses has been strongly affected by cultural differences since
their initial domestication around 3,500 BC. To investigate the history of
domestic horses with respect to this charismatic phenotypic character, the
scientists analysed a dataset of 201 samples of ancient horse DNA. In total,
they detected 14 different color types. Early breeds showed six color variants,
of which three were already present in pre-domestic horses. During the Bronze
Age (2,700 -- 900 BC) and Iron Age (900 BC -- 400 AD) the number of color
variants further increased from six to nine, indicating a human preference for
new colors. During these periods spotted and diluted horses were most frequent.
During medieval times, the attractiveness
of spotted horses decreased and solid coat colors, especially chestnut, became
dominant. Religious symbolism may have played a role in the shift from
dominance to the decline of spotted horses. At the beginning of the Middle Ages
this type was preferred by royalty, possibly influenced by the last book of the
New Testament, the "Apocalypse of St. John" (AD 81-96). It described
four riders on differently colored horses. The rider of victory was sitting on
a white or white spotted horse, whereas the riders of famine (black), death (bay)
and war (chestnut) rode on solid colored horses. After several epidemics this
symbolism changed: the "good" rider of victory was replaced by the
"bad" rider of the plague but still sitting on a white or
white-spotted horse. Consequently, white and spotted horses now had a negative
connotation, resulting in a lower religious prestige of these colorations.
Further reasons for the decrease of spotted types might have been novel
developments in weaponry such as the longbow, with these horses being an easier
target than solid ones.
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