It is all very well to know how much feed an animal or a herd of animals needs. It is also useful to know how to formulate rations for these requirements and to know how to mix such rations. However, if the feed is the most expensive input in a livestock production system then the management of the feed throughout the production cycle, where the correct nutrients are provided to the herd on an ongoing basis, becomes crucial. This is known as “feed flow”. How does the farmer plan this annual feed flow?