Complete Guide to Feeding Horses with Silage: Proper Procedures and Nutrition

Introduction to Silage for Horses

Silage, also known as fermented forage, is a popular feed for horses in many parts of the world. It offers a nutritious alternative to hay, especially in regions where hay is scarce or of poor quality. However, feeding silage requires careful management to ensure safety and optimal nutrition. This guide provides a step-by-step procedure for incorporating silage into your horse's diet.

Recommended Diet Types

Silage is a form of preserved forage made by fermenting grasses or legumes in airtight conditions. It is typically fed as part of a balanced diet that may include:

• Silage alone (if of high quality and appropriate for the horse's needs)
• Silage plus hay (to increase dry matter intake)
• Silage with concentrates (for horses with high energy demands, such as performance horses)

Silage can replace up to 50-100% of the forage portion of a horse's diet, but it is crucial to transition gradually.

Feeding Amounts by Age, Size, and Activity Level

The amount of silage to feed depends on the horse's weight, activity level, and individual metabolism. General guidelines:

Always adjust based on body condition score and weight changes. Silage is around 30-40% dry matter, so 10-15 kg supplies about 3-6 kg of dry matter. Ensure total dry matter intake is 1.5-2% of body weight per day.

Feeding Frequency and Schedule

Horses are natural grazers and should be fed frequently. For silage:

• Divide daily silage into at least two feedings (morning and evening).
• Ideally, feed three to four times per day, especially for horses prone to colic or laminitis.
• Silage can be fed as a single large meal if necessary, but multiple meals improve digestion and reduce waste.
• Feeding times should be consistent; horses thrive on routine.

Silage spoils quickly once exposed to air, so feed immediately after opening and remove any uneaten portions within 12 hours.

Essential Nutrients

A balanced diet must provide all essential nutrients. Silage is an excellent source of fiber and energy but may lack certain vitamins and minerals.

• Protein: Grass silage typically contains 8-15% crude protein on a dry matter basis. Legume silage (e.g., alfalfa) has higher protein (16-20%).
• Fats: Low in silage (1-4%), so additional fat may be needed for high-performance horses.
• Carbohydrates: Primarily fiber (NDF 40-60%), with some soluble sugars (WSC 8-15%).
• Vitamins: Vitamin E is abundant in fresh silage but decreases with storage. Vitamin A (beta-carotene) is present. Some silages may be deficient in vitamin B12.
• Minerals: Calcium, phosphorus, magnesium, and potassium vary. Silage is often low in sodium, so a salt block is essential.

Regular forage analysis is recommended to tailor supplementation.

Toxic Foods and Ingredients for Horses

While silage itself is not toxic, certain contaminants can be harmful:

• Moldy silage – Can contain mycotoxins leading to respiratory issues, colic, or neurological problems.
• Botulism – Improperly fermented silage (low acidity) can allow Clostridium botulinum growth. Avoid silage with a putrid odor.
• High sugar content – Silage from stressed plants (e.g., underdrought) may have elevated nitrates or sugars, risking laminitis in susceptible horses.
• Foreign objects – Check for soil, plastic, or other debris.

Additionally, common toxic foods for horses include avocado, chocolate, onions, garlic (in large amounts), and certain weeds. Never feed silage contaminated with these.

Water Intake Recommendations

Horses need constant access to clean water. Silage contains 60-70% moisture, which contributes to water intake, but fresh water must always be available.

• Adult horses: 30-50 liters per day, depending on temperature and workload.
• With silage, water consumption may decrease slightly due to the high moisture content. However, do not restrict water.
• In cold weather, ensure water is not frozen; in hot weather, provide additional sources.

Beneficial Supplements

Silage-based diets may benefit from:

• Vitamin E and selenium – Especially if silage is old or low in selenium.
• Probiotics – To support gut health during diet transitions.
• Omega-3 fatty acids – Flaxseed or fish oil for coat and joint health.
• Electrolytes – For horses in heavy work or hot climates.
• Calcium and phosphorus balance – If silage is high in calcium but low in phosphorus.

Always consult a veterinarian before adding supplements.

Feeding Differences: Young, Adult, and Senior Horses

• Young horses (weanlings, yearlings): Need higher protein and energy for growth. Use high-quality legume silage (alfalfa) and ensure proper calcium-to-phosphorus ratio (2:1). Feed 2-3 times daily.
• Adult horses (mature, working): Adjust silage amount based on energy needs. Use grass silage for maintenance; mix with hay for extra fiber. Monitor body condition.
• Senior horses (over 15 years): May have dental issues; silage is easier to chew and digest. Provide softer silage (earlier cut). Ensure adequate protein (14-16%) to prevent muscle loss. Supplement with senior feeds if needed.

Signs of Healthy vs. Unhealthy Diet

Monitor your horse's health to assess diet:

• Healthy: Shiny coat, bright eyes, consistent weight, firm manure (formed balls), good appetite, calm demeanor, and normal vital signs.
• Unhealthy: Dull coat, weight loss or gain, loose or dry manure, excessive gas, lethargy, colic signs (pawing, rolling), or refusal to eat silage.

If you notice changes, adjust diet gradually and consult a veterinarian or equine nutritionist.