Protein

Protein is a fundamental macronutrient composed of long chains of amino acids, which are essential for nearly every biological function in the horse’s body. It is required for the growth, repair, and maintenance of tissues, including muscle, skin, hair, enzymes, and hormones. Protein in equine diets is derived from a variety of plant and animal sources such as alfalfa, soybean meal, canola meal, peas, and occasionally animal-based ingredients like fish meal or hydrolyzed proteins.

In equine nutrition, protein quality is determined by its amino acid composition and digestibility. Essential amino acids—such as lysine, methionine, and threonine—must be supplied through the diet, as horses cannot synthesize them on their own. Protein requirements vary depending on age, workload, growth stage, reproductive status, and overall health.