Palatability - The degree of acceptability of a feed or feedstuff to be eaten by an animal. Appetite - Desire of an animal to eat. Satiety - Lack of desire to eat. Hunger - Physiological state that results from deprivation of feed of a general or specific type. Most animals have keener sense of smell than humans May serve as an attractant but not increase intake Taste - Basic tastes are sweet, sour, salty, bitter and common chemical sense.
Neural receptors relay information from gastrointestinal tract, liver and other organs to mid brain.