30/08/2023
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𝐇𝐀𝐈𝐑 𝐖𝐇𝐎𝐑𝐋 𝐏𝐎𝐒𝐈𝐓𝐈𝐎𝐍 𝐀𝐍𝐃 𝐋𝐀𝐓𝐄𝐑𝐀𝐋𝐈𝐓𝐘 (𝐬𝐢𝐝𝐞 𝐩𝐫𝐞𝐟𝐞𝐫𝐞𝐧𝐜𝐞) 𝐃𝐄𝐅𝐈𝐍𝐄𝐃
This knowledge is a game changer in the horse training business and for those in all the competition sports, and a valuable guide for horse owners looking to find the perfect horse for their lifestyle and riding pleasure. Geneticists in three countries have provided the first scientific evidence of the inheritance of hair whorls, links to behavior, and specific genes linked to certain hair whorl patterns. There's no scientific evidence more definitive than genetic evidence. Dr. Temple Grandin and I at Colorado State University waited 28 eight years since we published the first scientific evidence of the link from hair whorls to behavior for the genetic evidence we always knew would come. We never claimed to discover the relationship between hair whorls and behavior; people worldwide for thousands of years have casually observed the relationship. What we did that was new was show the link to lateralization of the nervous system and the hair whorls association with functional specialization of the cerebral hemispheres of the brain. I studied and documented the relationship for ten years before meeting Temple Grandin, working as a farrier and horse trainer. I learned the practical application of this knowledge in real-world situations before seeking and finding the academic support needed to make this useful information available to everyone.
This post aims to clarify and unify common terminology and principles of hair whorl height and position, either left, right, or center. For future posting on this page, this information is essential for you. The most important language to clarify relates to the side preference exhibited by horses and its relation to horse welfare concerns. The terminology in the horse industry, as is in the scientific language, is broad and varies between people in the US and other countries. The formal scientific term for this phenomenon is lateralization of the nervous system. Some scientists use a less formal term, 𝒍𝒂𝒕𝒆𝒓𝒂𝒍𝒊𝒕𝒚. 𝑯𝒂𝒏𝒅𝒆𝒅𝒏𝒆𝒔𝒔 is the general term used to describe the phenomenon across species that includes human handedness, paw preference in dogs, footedness in birds, and side preference in cattle, horses, and other herbivores. In my writing, I interchange the terms laterality, handedness, and side preference depending on sentence context, but they all mean the same thing.
I drew this graph on this horse because this horse represents a large proportion of horses and the hair whorl type that suffers from the most severe welfare concerns. It has a single whorl, is left of center, and is very.
𝐇𝐀𝐈𝐑 𝐖𝐇𝐎𝐑𝐋 𝐇𝐄𝐈𝐆𝐇𝐓
"Very Low" defines a non-reactive horse with low fear. "Low" whorls represent a horse as slightly more reactive than the "very low." "Very Lows" and "Lows" show minimal side preferences, and the hair whorls are usually in the center of the midline. The V-lines on the graph represent how, as the whorl gets higher, the side preference increases.
𝐌𝐈𝐃𝐃𝐋𝐄 𝐚𝐧𝐝 𝐇𝐈𝐆𝐇
Most horses are in the Middle and High Range. The reactivity and fearfulness are in the mid-range, with some variation. Reactivity is higher in the top portion of the High range and lower reactivity in the lower middle range. The V-shape on the graph represents side preferences. The higher the whorl on the forehead, the stronger their side preference.
𝐇𝐈𝐆𝐇 𝐀𝐍𝐃 𝐕𝐄𝐑𝐘 𝐇𝐈𝐆𝐇
A smaller portion of horses are in the "High" and "Very" High range. Both high and very high define highly reactive and fearful horses. Side preference is highest in these two ranges, and the distance left or right from the midline also increases the side preference strength. This horse represents very high nervous system reactivity and laterality but not extreme laterality (side preference). A hair whorl closer to V-line would be an example of extreme laterality.
𝐇𝐀𝐈𝐑 𝐖𝐇𝐎𝐑𝐋 𝐄𝐏𝐈𝐂𝐄𝐍𝐓𝐄𝐑
The epicenter defines the position of the whorl. This horse has a very high whorl slightly off to the horse's left side. This horse is highly reactive. The side preference is strong but not the strongest., and its natural fearfulness is very strong.
𝐒𝐔𝐌𝐌𝐀𝐑𝐘
Approximately 70% of horses have a left side whorl in the medium to high ranges. 10% to 15% have hair whorls on the right side. Approximately 10% have two side-by-side whorls, always in mid-to-high ranges, never low. The double side-by-side whorls we considered normal in our research.The doubles, either side by side or one above the other, are harder to define and require a separate post to clarify.
The remaining 5% have multiple or two whorls, one above the other. In our research, we considered these types of whorls abnormal.
The horse in this picture will favor the right lead and travel better in a circle to the right or clockwise. The left whorl and right turning preferences are similar to most right-handed people. The right side whorl is opposite, like left-handed people. The horse with a high right side whorl favors the left lead.
This horse's left eye is the "look out for danger" eye in horse's with a left side whorl, and prefers the right lead. The side of the whorl is the side the horse will give a farrier the hardest time. The opposite holds for the horse with a right side whorl.This horse's right eye is the "look out for danger" eye in horse's with a right side whorl, and this horse prefers the left lead.
The high reactivity(fearfulness) and the laterality (side preference) of the horse in the photograph and a horse with the opposite on the right side are the types of horses I encountered most while working as a farrier and horse trainer. The horses with the high right and left hair whorls show the most potential as high-performance horses, but they also represent the horses with the most severe welfare concerns. Unfortunately, when they have behavior problems, they are the most dangerous and unpredictable. It all depends on how they are raised and handled. Any clarifying questions are welcome.
