Feed in a bag is a term used to describe the process of pouring OATS into a bag for feeding animals. OATS are a type of cereal grain that is commonly used as animal feed, and can be found in many forms such as rolled OATS, oat groats, and oat bran. The term 'feed in a bag' refers to the process of pouring OATS into a bag for feeding animals. This method is often used for horses, cows, sheep, and other livestock.