Baby pigs do best on sow’s milk or a commercial piglet milk replacer specifically formulated to match it. In a pinch, goat’s milk is the closest natural alternative, while cow’s milk works as a short-term emergency option with some modifications. The type of milk matters because sow’s milk has a unique nutritional profile: roughly 5% protein, 7.5% fat, and 5% lactose in mature milk, with colostrum (the first milk after birth) containing around 16% protein and only 3% lactose.
Why Colostrum Comes First
Piglets are born with zero antibodies in their blood. Unlike humans and some other mammals, pigs cannot transfer immune protection to their young during pregnancy. The only way a newborn piglet gets disease-fighting antibodies is by drinking colostrum within the first 24 to 36 hours of life. Colostrum is packed with immunoglobulins, primarily IgG at concentrations even higher than what’s found in the sow’s own bloodstream. After roughly 24 hours, the piglet’s gut loses its ability to absorb these large antibody molecules directly into the bloodstream.
If you’re hand-raising piglets, sourcing colostrum is the single most important step. Frozen sow colostrum (from a previous litter or another sow) is ideal. Some farmers keep a supply in the freezer for emergencies. Without colostrum, piglets are extremely vulnerable to infections in their first weeks of life. Aim for at least 250 ml of total colostrum intake within the first 36 hours, feeding every 45 minutes initially.
Commercial Piglet Milk Replacers
After the colostrum window closes, a commercial piglet milk replacer is the gold standard for orphaned or rejected piglets. These formulas are engineered to closely mimic sow’s milk. A typical replacer contains whey protein concentrate, skim milk powder, casein, coconut oil, and lactose as its primary ingredients. When mixed, the nutrient profile lands around 28% crude protein and 25% fat on a dry-matter basis, along with added vitamins A, D, E, and K, B vitamins, and essential minerals like iron, zinc, and selenium.
Piglet milk replacers are available from farm supply stores and online livestock suppliers. Follow the mixing directions on the label carefully. Too concentrated a mix can overwhelm a piglet’s digestive system, while too dilute a mix won’t provide enough calories. Overfeeding protein in particular causes undigested material to ferment in the gut, producing toxic byproducts like ammonia and amines that damage the intestinal lining and trigger diarrhea.
Goat’s Milk as an Alternative
Among natural milks from other animals, goat’s milk is the best option for piglets. Its fat globules are smaller than those in cow’s milk, which makes them easier to digest. It also contains more short- and medium-chain fatty acids, and it forms a softer, looser curd in the stomach, allowing digestive enzymes to break down the protein more efficiently.
Research on neonatal piglets fed goat milk formula showed improved immune responses, better amino acid absorption, and a healthier balance of gut bacteria compared to those fed cow milk formula. Goat milk also triggers less immunological cross-reactivity, meaning piglets are less likely to have sensitivity issues with it. If you can get fresh or powdered goat’s milk, it’s a reliable bridge until you can source a proper milk replacer, or it can serve as the primary milk source if a replacer isn’t available.
Cow’s Milk in an Emergency
Cow’s milk is not ideal for piglets. It’s lower in fat and protein than sow’s milk, and its protein structure is harder for piglets to digest. That said, if cow’s milk is all you have, you can make it work temporarily with a simple recipe: 600 ml of whole cow’s milk, one egg yolk, a quarter teaspoon of citric acid, and half a teaspoon of cod liver oil. The egg yolk boosts the fat and protein content, the citric acid helps with curd formation and digestion, and the cod liver oil adds fat-soluble vitamins.
Another emergency option is canned condensed milk diluted with water at a ratio of roughly two parts condensed milk to one part water. This is purely a stopgap measure to keep piglets fed while you arrange a proper milk replacer.
What Not to Feed
Avoid plant-based milks entirely. Soy milk, almond milk, oat milk, and similar products lack the fat, protein, and lactose profile that piglets need, and they contain none of the animal-based proteins their digestive systems are built to handle. Skim or low-fat cow’s milk is also a poor choice because piglets need the caloric density that fat provides. Sweetened or flavored milks introduce sugars and additives that can cause digestive upset.
Feeding Temperature and Schedule
Warm any milk to body temperature (around 100°F or 38°C) before offering it, especially for piglets under a week old. Cold milk can chill a small piglet and slow digestion. A standard human baby bottle with a small nipple works well for feeding.
For the first few days, piglets need to eat frequently. Start with feedings every one to two hours during the day, then gradually stretch to every four hours as they grow stronger and take in more volume per feeding. By one to two weeks of age, most piglets can handle feedings every six to eight hours. Watch for signs of overfeeding: bloating, reluctance to eat, and watery stool all suggest you’re giving too much at once.
Transitioning to Solid Feed
Piglets can start nibbling on solid creep feed as early as 10 days of age, even while still drinking milk. Creep feed is a finely ground or pelleted starter diet placed in a shallow tray where piglets can explore it. They won’t eat much at first, but early exposure gets their digestive enzymes and gut bacteria developing for the transition ahead.
Full weaning typically happens between 3 and 5 weeks of age, with most piglets weighing somewhere between 8 and 11 kg (roughly 18 to 24 pounds). Lighter piglets benefit from a longer milk-feeding period. Weaning too early or too abruptly is one of the most common triggers for nutritional diarrhea in piglets, as the sudden shift from milk to solid feed disrupts the balance of fluid absorption and secretion in the gut. A gradual transition over several days, slowly reducing milk volume while increasing access to starter feed, gives the intestinal lining time to adapt.