Why is my mustang losing weight in winter?
Winter weight loss in mustangs usually results from a combination of increased caloric demands for staying warm and a decline in pasture or hay quality. Mustangs have evolved to handle harsh conditions, but domestication and management changes can make them vulnerable. Let’s break down why and what you can do.
Understanding Cold Stress and Energy Needs
When temperatures drop below your horse’s lower critical temperature (LCT), around 40-50°F for mustangs with a winter coat, their metabolism ramps up to generate body heat. This can increase energy requirements by 10-20% for every 10°F below the LCT. If your mustang isn’t getting enough calories through forage, they’ll start burning fat and muscle reserves.
Signs of cold stress include shivering, seeking shelter, and a tucked posture. Ensure your horse has access to a windbreak or run-in shed. Blanketing can help, but mustangs often grow a thick coat- avoid over-blanketing which can mat the coat and reduce insulation.
Forage Quality and Quantity
Winter pastures are typically low in nutrients. Even if your mustang is on winter pasture, the grass quality drops significantly after frost. Hay can also vary widely in quality. Have your hay tested for nutritional content; mature grass hay might have less than 10% protein and moderate fiber, which is insufficient for weight maintenance in cold weather.
Feed 1.5-2% of body weight in good-quality hay daily. For a 1,000-lb mustang, that’s 15-20 lbs per day. If hay is low in protein (below 10%), supplement with alfalfa hay or a protein balancer pellet. Soaking hay can reduce dust and mold, but also leaches nutrients- avoid soaking for more than 30 minutes.
Dental and Health Issues
Weight loss can signal underlying health problems that become more pronounced in winter. Common culprits include:
- Dental problems: Sharp points, missing teeth, or gum disease make chewing painful and inefficient. Your horse may drop feed, slobber, or take longer to eat. Have a veterinarian perform a dental exam at least annually.
- Parasites: Heavy worm burdens, especially small strongyles, can interfere with nutrient absorption. A fecal egg count test helps guide deworming; don’t over-deworm as resistance is common.
- Chronic diseases: PPID (Cushing’s disease), often seen in older horses, can cause weight loss, a long curly coat, and delayed shedding. Other issues like liver or kidney disease also need veterinary evaluation.
Body Condition Scoring and Management
Use the Henneke Body Condition Scoring system (1-9 scale) to assess your mustang monthly. Aim for a score of 5-6 (moderate to moderately fleshy) going into winter. If your horse drops below 4, act immediately.
Increase hay gradually- sudden large amounts can cause colic. Add a ration balancer or concentrate if needed, but avoid high-starch grains which can cause colic or laminitis. Fats like vegetable oil (1-2 cups/day) or stabilized rice bran are calorie-dense and support coat quality.
Free-choice water is critical. Dehydration reduces feed intake and slows digestion. Heated buckets or tank heaters prevent ice. Salt blocks (plain white, not mineral) encourage drinking.
When to Consult a Vet
If despite improving diet and management, your mustang continues to lose weight over weeks, call your vet. They can run blood work, check for ulcers, perform dental floats, or adjust deworming. Sudden or severe weight loss (more than 5% body weight in a month) warrants immediate attention.
Weight loss accompanied by other symptoms like lameness, diarrhea, coughing, or fever also needs a vet visit. Remember, you are the first line of observation- your vet relies on your reports to diagnose.
Key feeding tips for winter
- Feed high-quality hay at 1.5-2% body weight daily.
- Provide free-choice salt and fresh, unfrozen water.
- Use body condition scoring monthly to catch changes early.
- Adjust feed gradually and monitor manure consistency.
- Work with your vet for dental care and parasite control.
By understanding the extra demands winter places on your mustang and taking proactive steps, you can help them maintain a healthy weight through the cold months. Every horse is an individual- what works for one may not work for another. Observe, adjust, and keep your vet in the loop.
Key Takeaway
Winter weight loss in mustangs usually results from increased energy needs and poor forage; address it with high-quality hay, body condition scoring, and vet checks for dental issues, parasites, or disease.