Pumpkin is widely recommended in backyard chicken circles as a natural dewormer, but the research tells a different story. No peer-reviewed study has confirmed that feeding pumpkin or pumpkin seeds to chickens reduces their worm burden. Pumpkin does contain compounds with anti-parasite properties in lab settings, but those effects haven’t translated into real results when fed to live birds.
What the Science Actually Shows
The most direct test of this idea came from a study on laying hens naturally infected with Ascaridia galli, the most common roundworm in chickens. Hens were fed 10 grams of pumpkin seeds per bird per day. Researchers tracked both the number of parasite eggs in the birds’ droppings and the actual worm counts after the trial ended. The results were unambiguous: there was no statistically significant reduction in egg counts, total worm burden, or worm fertility compared to untreated hens. The study’s conclusion was blunt: “no evidence of anthelmintic effects of pumpkin seeds.”
A separate study at Auburn University tested pumpkin seed at 1% feed inclusion for hens infected with A. galli. While the pumpkin didn’t eliminate worms, it did help prevent the drop in nutrient digestibility that roundworm infections typically cause, possibly by supporting healthier gut bacteria. That’s a meaningful finding, but it’s not deworming.
Why Pumpkin Gets Credit It Hasn’t Earned
Pumpkin seeds do contain compounds that can paralyze or inhibit worm movement in a petri dish. The key players include cucurbitine (an amino acid), certain alkaloids, and fatty acids. In laboratory tests on isolated nematodes, alcoholic extracts of pumpkin seed reduced worm motility. Some researchers have also identified protoberberine alkaloids in pumpkin seeds that may contribute to this effect.
The problem is concentration. Positive lab results typically use concentrated extracts, not raw seeds. When a chicken pecks at pumpkin flesh or swallows whole seeds, the amount of active compounds reaching the parasites in its gut is far lower than what’s used in controlled in vitro experiments. There’s no established dose of raw pumpkin that produces a reliable deworming effect in poultry, and the gap between “kills worms in a dish” and “kills worms in a living bird” is enormous.
Common Chicken Parasites Pumpkin Won’t Solve
Backyard and free-range chickens face several intestinal parasites. Ascaridia galli (large roundworm) is the most prevalent, infecting anywhere from 70% to nearly 90% of free-range flocks depending on the region. Heterakis gallinarum (cecal worm) is another common species, and it carries a secondary risk because it can transmit the organism that causes blackhead disease. Capillaria (hairworms) and tapeworms round out the usual suspects.
The studies that exist focus almost exclusively on A. galli, and even against that single species, pumpkin seeds failed to reduce worm numbers. There’s no research suggesting pumpkin would work against cecal worms, hairworms, or tapeworms in chickens either. If your birds have a confirmed parasite load, effective veterinary dewormers remain the only proven option.
Pumpkin Still Has Real Value for Chickens
Even though pumpkin won’t clear a worm infection, it’s a genuinely nutritious treat. Pumpkin flesh is rich in beta-carotene (3,100 micrograms per 100 grams), which the body converts to vitamin A, essential for immune function and healthy mucous membranes in the gut and respiratory tract. It also provides vitamin C, vitamin E, potassium, magnesium, and phosphorus. The seeds add protein, healthy fats, and zinc.
Pumpkin peel contains polysaccharides that support beneficial gut bacteria, which may help chickens better absorb nutrients and maintain a healthier intestinal environment. The Auburn University study’s finding that pumpkin helped preserve nutrient digestibility in infected hens fits this picture. A chicken with stronger gut health and better nutrient absorption is generally more resilient, even if the pumpkin isn’t directly killing parasites.
The feed conversion data is also interesting. In one trial, hens receiving pumpkin seeds converted feed to eggs more efficiently (1.9 grams of feed per gram of egg) than control hens (2.2 grams per gram of egg), a statistically significant difference. Better feed efficiency means your birds are getting more out of what they eat.
How to Feed Pumpkin Safely
Cut a pumpkin in half or into chunks so your chickens can reach the flesh and seeds easily. Raw or cooked both work fine. A small handful of seeds per bird per week is a reasonable amount as a supplemental treat. You can also scatter raw seeds on the ground to encourage natural foraging behavior.
Overfeeding is worth watching for. Historical veterinary reports note that livestock given large amounts of pumpkin seed sometimes developed diarrhea, and stockowners have occasionally reported neurological symptoms in poultry fed excessive quantities. In moderate amounts, the oils and other compounds in pumpkin seed appear safe. The key word is moderate: pumpkin should be a supplement to a balanced layer or grower feed, not a staple.
What Actually Works for Chicken Parasites
If you suspect worms, start with a fecal egg count. Your veterinarian or a poultry diagnostic lab can examine a dropping sample under a microscope and tell you exactly which parasites are present and how heavy the infection is. This costs relatively little and prevents you from treating blindly.
For confirmed infections, approved anthelmintic medications are effective and well-studied. Your vet can recommend the right product based on the parasite species identified. Many backyard flock owners also reduce reinfection by rotating pasture areas, keeping coops dry and clean, and avoiding overcrowding, since most chicken parasites spread through contaminated soil and droppings.
Pumpkin can absolutely be part of your flock’s diet for its nutritional benefits and gut-health support. Just don’t rely on it as your deworming strategy.