A baby donkey is called a foal, the same word used for a newborn horse. If you want to be more specific, a male baby donkey is a colt and a female is a filly. The terminology goes deeper than that single word, though, and the early life of a donkey foal turns out to be biologically distinct from that of its horse cousins in ways that matter for anyone who breeds, raises, or simply admires these animals.
The Full Set of Donkey Terms
Donkey vocabulary closely mirrors horse vocabulary, which makes sense given that the two animals share a genus. Here are the terms you will encounter:
- Foal: a baby donkey of either sex, from birth through its first year or so.
- Colt: a young male donkey, sometimes called a “jack foal.”
- Filly: a young female donkey, sometimes called a “jenny foal.”
- Jack: an adult intact male donkey. “Jackass” is not a slur here; it is the traditional term.
- Jenny: an adult female donkey, also called a jennet.
- Gelding: a castrated male donkey.
Veterinary literature uses these terms consistently. A study of 44 newborn Amiata donkeys, for instance, classified the animals as “colts” and “fillies” born from “jennies,” treating the terminology as standard across equine science.1PubMed. Relation between Apgar scoring and physical parameters in 44 newborn Amiata donkey foals at birth You will sometimes hear people call a baby donkey a “burro foal” (burro being the Spanish-derived word for donkey common in the American Southwest), but “foal” alone covers it everywhere.
Where Mules and Hinnies Fit In
A mule is the offspring of a jack (male donkey) and a mare (female horse). Flip the cross and you get a hinny, from a stallion and a jenny. Both are called foals at birth, just like purebred donkeys or horses. The practical difference is that mules and hinnies are nearly always sterile, because donkeys carry 62 chromosomes and horses carry 64. The resulting 63-chromosome hybrid cannot reliably produce viable eggs or sperm. A handful of documented cases exist of fertile female mules, but they are so rare they make the news when they happen. The question of what to call a mule’s offspring is, for all practical purposes, moot.
If you have ever wondered why “mule foal” sounds odd, it is partly because most people associate the word “foal” with animals that will eventually reproduce. Mule foals grow up, but the lineage stops with them.
A Year-Long Pregnancy
Donkey pregnancies run long. The average gestation in jennies is about 371 days, roughly a full year and slightly longer than the typical horse pregnancy of around 340 days.2PubMed. Factors affecting pregnancy length and phases of parturition in Martina Franca jennies That extra month matters for breeders who are planning foaling seasons and arranging veterinary care.
One interesting wrinkle is that the sex of the foal affects how long the jenny carries it. Jennies bearing male foals tend to have noticeably longer gestations than those carrying females.2PubMed. Factors affecting pregnancy length and phases of parturition in Martina Franca jennies The mechanism behind this is not entirely clear, but the pattern has been documented in horses as well and may relate to hormonal differences driven by the fetus. For a breeder tracking due dates, knowing the foal’s sex via ultrasound can help narrow the window.
The actual process of foaling, once labor starts, unfolds on a similar timeline to horse births. Where donkeys diverge is in what happens immediately after. The newborn donkey foal’s adaptation to life outside the womb is slower compared to a horse foal.2PubMed. Factors affecting pregnancy length and phases of parturition in Martina Franca jennies That does not mean something is wrong. It means that applying horse-foal benchmarks to a donkey newborn can make a perfectly healthy foal look delayed when it is simply operating on donkey time.
The First Hours of Life
A donkey foal’s first challenge is coordinating its legs well enough to stand. The struggle to move from lying flat to sternal recumbency (chest down, legs tucked under), then to a shaky standing position, and finally to nursing from its mother represents the core sequence veterinarians watch for.1PubMed. Relation between Apgar scoring and physical parameters in 44 newborn Amiata donkey foals at birth Most donkey foals complete the whole sequence within roughly two hours of birth.3Applied Animal Behaviour Science. Donkey behaviour and cognition: A literature review That sounds fast for an animal that was born minutes ago, but it is actually a bit slower than what you would expect from a horse foal of the same age, consistent with the broader pattern of donkey neonates taking their time.
Veterinarians sometimes use an Apgar-style scoring system to assess newborn donkey health at birth, similar to the one used in human medicine. In a study of 44 Amiata donkey foals, most scored well, and there was no difference in scores between male and female foals.1PubMed. Relation between Apgar scoring and physical parameters in 44 newborn Amiata donkey foals at birth The scoring checks things like muscle tone, reflexes, and respiratory effort. It gives breeders and vets an early heads-up if a foal needs intervention, but for most healthy donkey births, the newborn manages the transition on its own.
Sensory Development and How Foals Learn Their Mothers
What is happening inside the foal’s brain during those first hours is just as important as the physical milestones. Donkeys develop most of their sensory, motor, and behavioral abilities within the first 24 hours after birth.3Applied Animal Behaviour Science. Donkey behaviour and cognition: A literature review But the mother and foal use different senses to recognize each other. Jennies rely heavily on smell. Within minutes of delivery, a jenny is sniffing and nuzzling her newborn, using olfactory cues to establish the bond. The foal, on the other hand, relies more on sight. Visual recognition of its mother appears to be the primary way a donkey foal figures out who it belongs to.3Applied Animal Behaviour Science. Donkey behaviour and cognition: A literature review
This asymmetry is worth knowing if you manage donkeys. A jenny separated from her foal right after birth may struggle to bond if she cannot smell the newborn during that critical early window. A foal that cannot see its mother clearly, perhaps because of low light or a physical barrier, may have trouble forming its side of the attachment. The practical takeaway is to leave the pair together, undisturbed, for as long as possible in the hours after birth.
The Strongest Bond in Donkey Society
Donkeys are often described as solitary compared to horses, and there is some truth to that. They do not form the large, stable herds that horses do. But the relationship between a jenny and her foal is the exception. It is the only truly permanent social bond in donkey social structure.4Journal of Veterinary Behavior. Behavior of Martina Franca donkey breed jenny-and-foal dyad in the neonatal period This jenny-foal pair, sometimes called a dyad, forms the basic social unit. Dyads may travel together across large territories, join loosely affiliated groups of other dyads, or remain more or less in one place.4Journal of Veterinary Behavior. Behavior of Martina Franca donkey breed jenny-and-foal dyad in the neonatal period
This has implications for management. Separating a jenny from her young foal causes more distress in donkeys than many people expect, partly because the bond is so central to how donkeys organize their social world. If you manage a donkey herd, keeping the jenny-foal dyad together is not just sentimental; it reflects the natural architecture of donkey social life. Disrupting it too early risks behavioral problems in the foal and anxiety in the jenny.
Common Health Risks for Newborn Donkeys
Donkey foals face many of the same threats as horse foals in their first days, but the research base is thinner. A review of donkey neonatology identifies sepsis, failure of transfer of passive immunity, dysmaturity, and umbilical disorders as the most common problems.5PubMed Central. An Overview of Donkey Neonatology
Failure of passive transfer deserves a note because it is both common and fixable. Newborn foals are born with almost no circulating antibodies. They rely entirely on colostrum, the first milk the jenny produces, to acquire immune protection. If a foal does not nurse enough colostrum in the first several hours, or if the jenny’s colostrum is poor quality, the foal enters life with a dangerously weak immune system. A simple blood test can check antibody levels within the first day. If they are low, a veterinarian can administer plasma to bridge the gap. The difference between catching this early and missing it can be the difference between a healthy foal and a foal fighting sepsis within a week.
Dysmaturity, where the foal is born looking full-term but behaving as if premature, is another issue to watch for. Dysmature donkey foals may be weak, slow to stand, and poor nursers. Because donkey foals are already slower than horse foals to reach neonatal milestones, distinguishing normal donkey slowness from genuine dysmaturity requires experience with the species. Applying horse-foal timetables here is one of the most common mistakes less experienced breeders make.
Feeding, Weaning, and an Unusual Resilience
Donkey foals nurse frequently in the first weeks of life, with the jenny’s milk providing virtually all their calories. Solid feed becomes part of the diet gradually, but foals under about ten weeks old do not eat enough of it to meet their nutritional needs if separated from their mothers during the day.6PLoS ONE. Survey of biochemical and oxidative profile in donkey foals suckled with one natural and one semi-artificial technique
An interesting finding from research on donkey milk production is that donkey foals appear to tolerate short daily fasting periods remarkably well. In a trial where foals were separated from their dams for 12 hours a day, the foals that had access only to solid feed during that window, rather than a supplemental milk formula, were effectively fasting for the first couple of weeks since they could not yet eat enough solids to compensate. Despite this, they showed no metabolic imbalance or deficit.6PLoS ONE. Survey of biochemical and oxidative profile in donkey foals suckled with one natural and one semi-artificial technique Researchers described the foals as showing “high resistance and resilience to short fasting periods, even repeatedly on a daily basis.”6PLoS ONE. Survey of biochemical and oxidative profile in donkey foals suckled with one natural and one semi-artificial technique That resilience is consistent with the donkey’s evolutionary heritage as a semi-arid adapted animal, accustomed to irregular access to food and water. It does not mean foals should be starved on purpose, but it does mean that brief separations for milking or management are less metabolically dangerous than you might fear.
Weaning typically happens around five to six months, though the exact timing varies by breed, management system, and the foal’s development. In traditional extensive systems where jennies and foals range freely, foals may nurse opportunistically for longer. In managed dairy operations where the jenny’s milk is collected for human consumption, the process is more structured, with foals transitioned to solid feed on a deliberate schedule.
What Donkey Foals Grow Up to Do
Donkeys have served humans for thousands of years as pack animals, riding animals, and companions, but one of their more unusual modern roles is livestock guardian. In parts of the United States, South Africa, and Australia, donkeys are placed with sheep or goat flocks to deter predators like coyotes and jackals. A global review of this practice found that roughly 60% of donkeys were rated fair to excellent at guarding against coyotes by the producers who used them.7PubMed Central. A global review of Livestock Guardian Donkeys (LGDks) in the prevention of carnivore depredation South African producers reported lamb and kid weaning rates of over 90% and predation losses of just 0 to 10% during periods when guardian donkeys were in use.7PubMed Central. A global review of Livestock Guardian Donkeys (LGDks) in the prevention of carnivore depredation
Guardian donkeys are typically jennies or geldings. Jacks are too aggressive and unpredictable to be trusted with small livestock. The best guardians are animals that were raised around the species they will protect, which means early socialization matters. A foal raised alongside lambs from a young age is more likely to bond with and defend them as an adult. This is one reason breeders who supply guardian donkeys pay careful attention to how and where their foals are raised.
Donkey Foals in Language and Culture
The word “foal” is the standard English term, but donkey young have shown up in other languages in unexpected ways. In medieval China, the term for “donkey foal” appeared as a common pejorative for toddlers in the northern regions above the Yellow River. The expression shows up in the sixth-century “Family Instructions for the Yǎn Clan,” listed alongside “piglet” as a typical derogatory nickname for small children.8International Journal of Eurasian Linguistics. Following the Donkey’s Trail (Part I): a Linguistic and Archaeological Study on the Introduction of Domestic Donkeys to China The fact that donkey foals were familiar enough in everyday life to serve as a casual insult tells you something about how deeply integrated donkeys were into northern Chinese agriculture by that period.
In English, the word “ass” predates “donkey” by centuries. “Donkey” only entered common English use in the late 1700s, possibly as a diminutive or rhyming slang. The older word gave us “jackass” for a male donkey, which eventually drifted into general slang. “Foal,” meanwhile, comes from Old English “fola” and has been used for the young of equines for over a thousand years. Unlike “donkey,” which carries a vaguely comedic connotation in modern English, “foal” has always been a straightforward, neutral descriptor. When people say “baby donkey” instead of “foal,” it is usually because they do not know the proper term rather than because they are avoiding one. Now you do.