Fescue hay can work for goats, but it comes with a significant caveat: the variety matters enormously. Most tall fescue in the United States is Kentucky 31 (KY-31), which harbors a fungus that produces toxins harmful to goats. If your fescue hay is endophyte-free or a novel endophyte variety, it provides decent nutrition. If it’s standard KY-31 with a high endophyte infection rate, it can suppress weight gain, reduce milk production, and in severe cases cause tissue damage in your goats’ hooves and extremities.
Nutritional Value of Fescue Hay
Tall fescue hay cut at the right stage offers moderate nutrition for goats. When harvested in mid-May during early growth, it typically contains around 13% crude protein and 67% neutral detergent fiber (NDF), with about 61% digestibility. That protein level meets the maintenance needs of most adult goats, though it falls short for lactating does or fast-growing kids without supplementation.
The problem is that fescue hay quality drops fast as the plant matures. By late July, crude protein falls to roughly 9%, fiber climbs to nearly 74%, and digestibility drops to about 45%. Lignin, the woody compound that makes fiber harder to break down, increases steadily as the plant ages. This means late-cut fescue hay is substantially less nutritious, and goats will extract less energy from every mouthful. If you’re buying fescue hay and don’t know when it was cut, a forage test is worth the small cost.
The Endophyte Problem
The real concern with fescue hay isn’t its fiber or protein levels. It’s the fungus living inside most tall fescue plants. This endophyte produces ergot alkaloids, compounds that constrict blood vessels throughout the body. The fungus benefits the grass by making it hardier and more drought-resistant, but those same alkaloids are toxic to goats and other livestock.
A study published in Small Ruminant Research tested this directly by feeding meat goat does either endophyte-infected or endophyte-free tall fescue for 10 weeks. The goats eating the infected fescue gained 47% less weight and refused 98% more feed. Even when researchers controlled for the lower intake by equalizing how much both groups ate, the goats on infected fescue still gained less weight. This means the toxins themselves suppress growth, not just appetite. The alkaloids negatively affect growth, reproduction, and milk production across livestock species.
Signs of Fescue Toxicosis in Goats
Fescue toxicosis shows up differently depending on the season and severity. In warm weather, ergot alkaloids constrict blood vessels and impair your goat’s ability to cool down, leading to heat intolerance, reduced appetite, and poor performance. One of the earliest and most visible signs is a rough hair coat or failure to shed the winter coat as temperatures rise. If your goats look shaggy well into summer, fescue toxins could be the reason.
In cold weather, the same blood vessel constriction creates a different problem. Reduced blood flow to the feet, ears, and tail can lead to a condition called “fescue foot,” where tissue dies from lack of circulation. In severe cases, goats can lose hooves or tail tips to dry gangrene. The combination of cold temperatures narrowing blood vessels on their own, plus the alkaloids narrowing them further, cuts off circulation to extremities entirely.
Risks for Pregnant and Nursing Does
Pregnant does are especially vulnerable to fescue toxins. While most of the specific research has been conducted in horses and cattle, the underlying mechanism applies across species. Ergot alkaloids are associated with prolonged gestation, difficult births, thickened or retained placentas, and poor or absent milk production. The toxins can also interfere with conception, cycling, pregnancy rates, and early embryonic survival.
If you’re raising goats for breeding or milk, feeding endophyte-infected fescue hay during the last trimester or early lactation is a risk not worth taking. Switching to a different forage source during these critical windows is the simplest way to protect your does and kids.
How Long Toxins Persist in Stored Hay
One common misconception is that baling and storing fescue eliminates the endophyte problem. It doesn’t. The endophyte can persist in stored hay for up to two years. So last year’s KY-31 fescue hay can still contain enough ergot alkaloids to affect your goats. You cannot assume that age has made the hay safe.
Safer Fescue Varieties
Not all tall fescue is created equal, and the variety you choose determines whether fescue is a reasonable forage or a health hazard for your goats.
- Kentucky 31 (KY-31): The most common variety and the most problematic. The vast majority of KY-31 stands carry high endophyte infection rates, often producing ergot alkaloid concentrations ranging from a few hundred to over 1,000 parts per billion (ppb). For reference, concentrations as low as 449 ppb caused lameness in cattle, and 540 ppb was associated with visible inflammation around the hooves in sheep.
- Endophyte-free fescue: Varieties bred without the fungus entirely. These are safe for goats and provide the same basic nutrition without the toxin risk. The tradeoff is that endophyte-free fescue is less drought-tolerant and less persistent in pastures.
- Novel endophyte fescue: Newer varieties that contain an endophyte producing different, non-toxic compounds. These give the grass the hardiness benefits of the fungus without the harmful alkaloids. This is the best option if you want fescue that’s both productive in the field and safe for your goats.
Testing Your Hay
If you already have fescue hay and aren’t sure whether it’s safe, you can get it tested. Two separate tests are needed. The first checks whether the endophyte is present at all, using either a staining technique viewed under a microscope or an immunoblot method that works similarly to a home pregnancy test by detecting fungal proteins. The second test measures the actual concentration of ergot alkaloids in the plant tissue. Knowing the endophyte is present doesn’t tell you how much toxin your hay contains, so both tests together give you the full picture.
The University of Kentucky Veterinary Diagnostic Laboratory offers ergovaline testing specifically. When submitting samples, look for their toxicology section and select the ergovaline option. Your local extension office can also point you to labs that handle forage alkaloid analysis.
Making Fescue Hay Work
If infected fescue hay is what you have available, there are ways to reduce the risk. Diluting fescue hay with legume hay like clover or alfalfa lowers the overall alkaloid load in your goats’ diet while boosting protein and energy. Adding supplemental grain helps offset the reduced feed efficiency caused by the toxins. Keeping fescue hay to no more than half the total diet is a practical guideline when you can’t avoid it entirely.
For goats that aren’t pregnant, nursing, or being pushed for rapid growth, moderate amounts of infected fescue hay mixed with other forages is manageable. The key is knowing what you’re feeding. A hay test that comes back showing low endophyte levels or low alkaloid concentrations gives you much more confidence than guessing. And for does in late pregnancy or early lactation, replacing fescue entirely with another forage is the safest approach.