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Hinny
A hinny is the offspring of a male horse and a female donkey (jennet or jenny). Additional recommended knowledge
Hinnies compared with mulesHinnies are rarer than mules, which are the offspring of a male donkey and a female horse. The hinny is sterile with only one recorded exception. [1][2] SimilaritiesHinnies are not similar to mules in that they are generally more intelligent than horses, and more cooperative than donkeys. Both are also healthier and less expensive to feed and maintain than horses. This is a trait these hybrids get from their donkey heritage. The donkey is a notoriously hardy creature that, in the wild, survives on a harsh diet in a desert environment. DifferencesHinnies are on average slightly smaller than mules. There is much speculation as to the size variances among the two types of hybrids. Some fanciers believe it is merely physiological, due to the smaller size of the donkey dam versus a large horse mare. Others claim it is genetic. The view of the American Donkey and Mule Society is, "The genetic inheritance of the hinny is exactly the same as the mule." Hinnies are smaller because donkeys are, for the most part, smaller than horses, and the growth potential of equine offspring is influenced by the size of the dam's womb. Hinnies do however, like mules, come in many sizes. This is because donkeys come in many sizes, from miniatures as small as 24 inches (610 mm) at the withers, to Mammoth donkey jacks and jennies that may be over 15 hands, approximately 60 inches (1524 mm) at the withers. Thus, a hinny is restricted to being about the size of the largest breed of donkey. Mules, however, have horse females as mothers, so they can be as large as the size of the largest breed of horse. There are some huge mules, mostly from work horse breeds such as the Belgian. Other than size, there are some minor differences that occur frequently between mules and hinnies. The head of a hinny resembles that of a horse, more so than mule heads do. Hinnies often have shorter ears, although they are still longer than those of horses, and more horse-like manes and tails than mules do. They often come in horse colors, as the male parent often determines the color of the coat. Therefore, mules usually have donkey coat colors. Certain traits, like the popular gait that some horses and donkeys possess, seem to pass more readily though the male parent. Therefore, many people have tried to produce gaited hybrids by using gaited male horses on female donkeys in hopes of creating gaited hinnies. Fertility, sterility, and rarityHinnies are difficult to obtain because of the differences in the number of chromosomes of the horse and the donkey. A donkey has 62 chromosomes, whereas a horse has 64. Hinnies, being hybrids of those two species, have 63 chromosomes and are sterile. The uneven number of chromosomes results in an incomplete reproductive system. According to the ADMS, "The equine hybrid is easier to obtain when the lower chromosome count, the donkey, is in the male. Therefore breeding for hinnies is more hit-and-miss than breeding for mules."[1] Male hinnies and mules are usually castrated to help control their behavior by eliminating their interest in females. The male hinny or mule can and will mate, but the emission is not fertile. There are no recorded cases of fertile male hinnies or male mules. Female hinnies and mules are not customarily spayed, and may or may not go through estrus. Female mules have been known to produce offspring when mated to a purebred horse or donkey, though this is extremely uncommon. Since 1527 there have been more than sixty documented cases of foals born to female mules around the world. In contrast, according to the ADMS, there is only one known case of a female hinny doing so, and she produced a mix which has, thus far, only been documented once among the offspring of female mules:
There are other reasons for the rarity of hinnies. Female donkeys, jennies, and male horses, stallions, are choosier about their mates than horse mares and donkey jacks. Thus, the two parties involved may not care to mate. Even if they do cooperate, female donkeys are less likely to conceive when bred to a horse than horse mares are when bred to a donkey. Breeding large hinnies is an even bigger challenge, as it requires a jenny of Mammoth donkey stock. Mammoth donkey stock is becoming increasingly rare and has been declared an endangered domestic breed. Fanciers are unlikely to devote a Mammoth jenny's valuable breeding time to producing sterile hinny hybrids when Mammoth females are in high demand to produce fertile pure-bred Mammoth foals. See alsoReferences
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Hinny". A list of authors is available in Wikipedia. |