A is the reciprocal and far less common hybrid. It is born when a male horse (a stallion ) mates with a female donkey (a jenny ).
: They often have a horse-like body and tail but with the donkey's characteristic long ears and thick head
However, when a mule (63 chromosomes) tries to reproduce, the cells contain . The 31 donkey chromosomes cannot align perfectly with the 32 horse chromosomes. They form "univalents" (chromosomes without a partner). Consequently, the mule’s body cannot produce viable sperm or eggs. Horse Mating Donkey
This less common pairing occurs when a male horse (stallion) mates with a female donkey (jenny). The offspring is called a . Hinnies are generally smaller than mules, possessing a head shape that more closely resembles a horse, but with the shorter legs and lower endurance typically associated with donkeys. They are rarer primarily because jennies are less likely to conceive when bred to stallions, and stallions can be hesitant to mate with donkeys. Biological and Behavioral Dynamics
[23]. Their hybrid offspring (mules and hinnies) end up with 63 chromosomes A is the reciprocal and far less common hybrid
are more difficult to produce because female donkeys (jennies) and male horses (stallions) can be more selective about their mates, and artificial insemination for this pairing has historically low efficiency Biological Process and Characteristics Caring for mules and hinnies | The Donkey Sanctuary
: Mules are smart and have a strong sense of self-preservation. People often mistake this for being "stubborn," but the mule is usually just stopping to sense danger. The 31 donkey chromosomes cannot align perfectly with
The mechanics of mating between a horse and a donkey are similar to same-species breeding, but differences in size, temperament, and chromosome count create unique challenges.
The result is a hybrid vigor (heterosis) that often outperforms both parent species in specific tasks—specifically carrying heavy loads over rough terrain for long hours.
Hybrid foals often have "contracted tendons" (club foot) because of the conflicting growth rates. They also have a high rate of neonatal maladjustment syndrome (dummy foal syndrome). You will likely need a veterinarian present.
When they mate, the offspring (Mule or Hinny) receives