Horses require a mix of carbohydrates, proteins, fats, vitamins, and minerals. Understanding these needs is crucial for maintaining their health and well-being. Energy requirements differ for maintenance, growth, pregnancy, lactation, and work. These requirements are influenced by factors such as the horse’s body weight, environmental conditions, and activity level. The digestible energy requirement for maintenance of a nonworking adult horse is approximately 0.03 Mcal/kg body weight. Energy needs increase in cold weather, during growth, pregnancy, lactation, and work.

Proteins are crucial for muscle maintenance and production, enzymes, and hormones. Essential amino acids, which the horse’s body cannot produce, must be included in the diet. The quality of protein sources is determined by their amino acid content. Lysine is particularly important for growth.  Minerals are vital for body tissue and various body processes. Calcium and phosphorus are the most required minerals, especially for growing horses. The dietary supply should contain more calcium than phosphorus. Other important minerals include sodium, potassium, zinc, and copper. It’s important to avoid excessive mineral supplementation, as some minerals can be toxic at high levels. Vitamins are necessary in trace amounts and most of the vitamin needs of horses are met by levels naturally found in grains and forages. However, some conditions, such as heavy work, may require supplementation.

Forage, including hay and grass, should form the bulk of a horse’s diet. It’s vital for digestive health and provides essential nutrients. The cornerstone of any horse diet, forage should be of high quality and free from mold and dust. Used to supplement forage, concentrates provide extra energy and nutrients, especially for working horses. Supplements can address specific nutritional needs or deficiencies but should be used judiciously.

Older horses often need specialized diets to maintain their health and manage age-related issues. The growing horses have unique dietary needs to support their development. Different levels of activity require adjustments in diet to meet energy demands. Regular, small meals mimic a horse’s natural grazing behavior and are best for digestive health. In colder months, horses may need more calories to maintain body heat. Hot weather can affect a horse’s appetite and hydration needs. Water is a crucial part of a horse’s diet and should always be available. Water is crucial for horses, with requirements varying based on environmental conditions, activity levels, and physiological status. The average minimal maintenance daily water requirement for a sedentary adult horse is 5 liters per 100 kg body weight per day. Factors like lactation, sweat losses, and diet type can significantly increase water needs.

Below is a table outlining the basic nutritional requirements for an average adult horse. Please note that these requirements can vary based on factors such as the horse’s age, weight, activity level, and overall health. Consulting with a veterinarian or an equine nutritionist is always recommended for specific dietary needs.