Water Intake in Horses - Mad Barn - Vet Talk

Transcript:

[0:00]

Hi everyone, welcome back to Mad Barn Academy, and if you’re new here, welcome — we hope to earn your subscription today. Our discussion for today’s presentation is going to be about water: the most important nutrient. I think we can all relate to having a horse or knowing a horse that is a poor drinker. With summer right around the corner and the 2024 competition season now in full swing, I thought this would be a great topic to cover today. So, let’s get started.

[0:38]

I felt like I couldn’t talk about water without including this classic saying: “You can lead a horse to water, but you can’t make him drink.” What I find amazing is that for hundreds, if not thousands, of years, we’ve recognized how stubborn horses can be about drinking water — so much so that the behavior inspired Haywood’s metaphor for stubborn people. We’ll wrap up today’s presentation with tips and tricks for encouraging drinking, so maybe — one horse at a time — we can phase out this saying. We’ll see.

[1:30]

Water is the most important nutrient and is involved in all physiological processes essential to life. The horse’s body is about 70% water, split between extracellular and intracellular compartments — meaning water is either inside cells (in the cytoplasm) or outside them (in blood plasma, interstitial fluid, GI fluid, etc.). Adequate hydration is critical for health and performance; every organ system and every cell in the body requires water. I’ve listed some key functions for horses specifically, but this is a short list compared to the wide-reaching effects of water throughout the body.

[2:33]

The average-sized horse in a thermoneutral climate (45–65°F or 7–18°C) will drink about 6–10 gallons (23–38 L) of water per day. This amount increases for horses in hot or humid climates, in moderate or heavy exercise, or lactating mares — sometimes to two or even three times maintenance requirements.

[3:16]

There are several ways to assess hydration status. The definitive method is bloodwork, where a vet measures hematocrit or packed cell volume (PCV). A normal PCV for an adult horse is 37–42%. Above 42% is considered hemoconcentration, most often caused by dehydration. A simple field estimate is checking mucous membrane moisture and capillary refill time (CRT). For a healthy horse, gums should be pink and moist, and color should return within two seconds after blanching. Dehydrated horses will have dry or tacky gums and a delayed CRT. For daily monitoring, pay attention to water buckets and manure consistency — fill buckets to the same level daily and check how much is left; normal manure should be formed but moist. Dry, hard fecal balls are a sign of inadequate water intake and increased impaction risk.

[5:21]

To maintain water balance (homeostasis), intake must equal output. Inputs come from drinking water, moisture in feed, and a small amount from metabolic water. Outputs are sweat, manure, urination, and a small percentage from insensible losses (e.g., respiration). Many factors affect both intake and output. Today, we’ll focus on intake, but note that diet, exercise, and health conditions affecting losses also influence intake needs.

[7:15]

Diet composition impacts intake. Horses on high-moisture diets (like fresh pasture) drink less; horses on low-moisture diets (like dry hay) drink more. Long-stem fiber draws water into the gut and increases thirst. High-protein diets also increase water intake because protein breakdown products are excreted in urine, requiring more water.

[8:31]

Water characteristics and availability matter. Horses drink better when water is a neutral temperature; cold water in winter can reduce intake. They generally drink more from buckets or open troughs than from automatic waterers. Sedimentation or contaminants can reduce palatability. Ambient temperature also plays a role — hotter climates increase water needs for thermoregulation and sweating. Physiological status matters too: exercise and lactation increase requirements. Finally, individual variation exists, so know your horse’s drinking habits to spot changes.

[10:37]

Tips to encourage water intake:

1. Ensure 24/7 access to fresh, clean water. Clean buckets, troughs, and automatic waterers regularly. Make sure all horses can access water sources easily.
2. Add salt and/or electrolytes to meals — 1–2 tablespoons plain salt daily for an average horse, up to 3 tablespoons in hot climates or with heavy work. Electrolytes can be added for special situations like travel or hot-weather exercise.
3. Use heated buckets or trough heaters in winter to keep water at a neutral temperature, and keep water free of ice.
4. Soak hay or grain meals to add moisture; soaked forage cubes or beet pulp can also help. Note: soaking hay leaches nutrients, so balance the diet accordingly.
5. Use buckets instead of automatic waterers; research suggests horses drink more from buckets, especially light-colored ones (teal or light blue were preferred in studies).
6. Offer flavored water for picky horses or during travel — options include electrolytes, Gatorade, apple cider vinegar, apple juice, or a handful of grain (“sweet tea”). Always offer plain water alongside flavored water, and avoid sugary options for horses with metabolic concerns.

[16:23]

Here are today’s references. Thanks for listening! Don’t forget to like and subscribe, and check out other videos on our channel. Additional links in the description include more on dehydration and encouraging good drinking habits. Feel free to reach out with questions. Until next time!