They lose digestive efficiency and require diets with higher amounts of quality protein, phosphorus, and vitamins. The nutrient requirements for senior horses are thought to be closer to those of yearlings than those of adult horses at maintenance. Senior horses first require high quality forage and often a concentrate designed to provide extra protein, minerals and vitamins. Generally a concentrate with a minimum of 13% protein, as well as vitamin and mineral fortification is necessary for aged horses. For horses that cannot chew forage, complete feeds (with all fibre included) should be fed. Robank Golden Years is a high fat, high fibre feed which is ideal for senior horses.