Mule and hinny – can you tell them apart?

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A mule, at left, and a hinny, at right.
A mule, at left, and a hinny, at right.

A new technique to identify mules and hinnies through mitochondrial DNA has been developed by researchers in Brazil.

It is difficult to separate mules (male donkey x female horse) and hinnies (male horse x female donkey) by appearance alone. The differences between them are subtle and not sufficient to confidently differentiate one hybrid from the other. For example, the head of a hinny is said to resemble that of a horse more than it does a mule, with shorter ears, and more horse-like manes and tails than mules.

Due to their hybrid vigor, the mule and hinny have been used worldwide for carrying loads and people, and for tilling the land from the ancient civilizations of Egypt, Mesopotamia, China, and the Roman Empire. Mules and hinnies are widely used in the management of cattle in large beef cattle ranches in Brazil, which are important to the regional economy.

Mules and hinnies have been used for thousands of years as beasts of burden and pack and riding animals.
Mules and hinnies have been used for thousands of years as beasts of burden and pack and riding animals.

As soon as horse and donkey species were domesticated, they were crossbred, producing humanity’s first documented attempt at animal genome manipulation.

The distinction between these two hybrids is pivotal for equid breeders, ranchers, and associations that keep the official pedigree of the animals.

The new technique involves looking for mitochondrial DNA (mtDNA), which is inherited from the mother.

In a report published in Genetics and Molecular Research, Mauricio M Franco and others describe a multiplex-polymerase chain reaction method, which targets the hyper-variable mitochondrial DNA D-loop region.

“Our method only permits us to identify the maternal origin of the hybrids, differentiating mules from hinnies,” they explain.

“However, the phenotypic (visual) differentiation of mules from horses and hinnies from donkeys is not a problem for breeders and ranchers, according to our field experience. Therefore, the pivotal problem is to distinguish mules from hinnies and for this, the method presented in this study is very effective.”

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They believe that their technique will allow a fast, cheap, and easy way to accurately differentiate hinnies and mules.

“This method can help breeders, ranchers, horse associations, animal science professionals, and researchers to manage their equid herds and pedigree registers with more confidence and precision.”

Quick method for identifying horse (Equus caballus) and donkey (Equus asinus) hybrids.
Franco MM, Santos JB, Mendonça AS, Silva TC, Antunes RC, Melo EO.
Genet Mol Res. 2016 Sep 23;15(3).
doi: 10.4238/gmr.15038895

Equine Science Update

3 thoughts on “Mule and hinny – can you tell them apart?

  • December 12, 2018 at 4:55 am
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    When will is be available to the wold? I have a few that I am questioning about of they are a mule or hinny.

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  • March 14, 2020 at 6:23 am
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    I have been told that a Mule in comparison to a Horse, is: stronger, lighter, smarter, more sure-footed (do to their peripheral vision[ability to view their hind hoof placement]) lighter and requires less feed and water. Am I correct?

    I was considering raising mules on my 9 acres in Southern New Mexico and use them for carrying tourists through our local Organ Mountains-Desert Peaks National Monument Park .

    For this purpose would you compare the Hinny to the Mule and are they a good fit for this project?

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    • August 21, 2020 at 9:54 pm
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      I can confirm the surefootedness and visibility of hoof placement advantage over a horse. I don’t know about the rest. If I’m not mistaken mules can’t run in fully extended gallop as horses do when raced. Fun fact, in Spanish “mula” is the feminine term “macho” is the masculine.

      Reply

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