Quick Answer
Only in moderation. Horses can eat kale, but it should be considered an occasional treat rather than a dietary staple. The key reason is kale’s high oxalate content, which can bind calcium and affect the horse’s calcium balance, potentially leading to nutritional deficiencies or metabolic problems over time. A few leaves a few times per week is safe for most horses. ## Is Kale Safe for Horses?
Kale is a leafy green vegetable that is part of the cabbage family. In small amounts, it is safe for horses. However, unlike many other treats, kale contains oxalates, which are naturally occurring compounds that can interfere with calcium absorption. Horses have a unique calcium metabolism, and excessive oxalates can lead to a condition called nutritional secondary hyperparathyroidism, also known as “big head disease.” This is more common in horses that graze on high-oxalate pasture, but it can occur with concentrated sources like kale. Additionally, kale is a cruciferous vegetable and can cause gas or bloating in some horses if introduced too quickly or fed in large amounts. Horses with certain health conditions, such as kidney disease or a history of calcium oxalate urinary stones, should avoid kale entirely. ## Benefits
– Rich in vitamins A, C, and K, supporting immune function and bone health.
– Contains antioxidants like beta-carotene and flavonoids that help reduce oxidative stress.
– Provides dietary fiber, which can aid in digestion when fed as a small part of the diet.
– Low in sugar and starch, making it a healthier treat option compared to sugary fruits or grains.
– High water content can help with hydration, especially during hot weather. ## Risks and Precautions
– High oxalate content can reduce calcium absorption and lead to metabolic bone disease over time.
– Cruciferous veggies may cause gas, colic, or digestive upset if fed in excess or too suddenly.
– Goitrogenic properties may interfere with thyroid function in large amounts, though rare in horses.
– Pesticide residues; always wash kale thoroughly or choose organic.
– Potential choking hazard if leaves are not chopped; horses tend to gulp food, so cut into manageable pieces.
– Not suitable for horses with urinary stones, kidney issues, or calcium metabolism disorders. ## How to Feed It Safely
– Portion: Start with 1-2 leaves per feeding, 2-3 times per week for an adult horse. Do not exceed 4-5 leaves per week.
– Frequency: Offer as an occasional treat, not a daily food. Rotate with other safe vegetables like carrots or apples.
– Preparation: Wash thoroughly to remove dirt and pesticides. Remove tough stems and chop leaves into small, manageable pieces to prevent choking.
– Introduction: Introduce kale slowly, monitoring for any signs of digestive upset or changes in behavior.
– Diet balance: Ensure the horse’s base diet is forage-based (hay or pasture) and balanced with a vitamin/mineral supplement as needed. Kale should never replace core nutrition.
– Consult a vet: Before adding kale to your horse’s diet, especially if your horse has health issues, consult a large-animal veterinarian. ## Bottom Line
Kale can be a healthy, low-sugar treat for horses when fed sparingly. However, its high oxalate content makes it unsuitable for regular or large-quantity feeding. Stick to a few leaves a few times per week, and always prioritize your horse’s primary diet of hay or grass. If you have concerns about calcium metabolism or other health conditions, check with your vet before offering kale.
Sources
What you need to know
Kale is a brassica, and like its relatives it is not outright toxic but can cause gas and is best fed only in tiny amounts. It does contain vitamins, yet horses gain nothing essential from it that good forage does not already provide, so there is little reason to make it a regular treat.
Beyond bloating, frequent or large servings of brassicas like kale can interfere with thyroid function and, in some cases, affect red blood cells, so moderation really matters. If you offer kale at all, keep it to a small leaf occasionally and watch for any wind or discomfort. For everyday enrichment, low-risk options such as carrot, apple or cucumber are a far better choice than leafy brassicas.