Fibre provided to layer flocks must be insoluble with as much as possible of a coarse texture. Fibre could be provided through the feed. According to the raw material available, total fibre content can be very variable. 2.5% of raw cellulose is considered as low level, above 5% as a high level. Most of the fibre can be provided by oilseed meal (sunflower / rapeseed), alfalfa (or lucerne), and oats. Cereal by-products could provide a good amount of fibre in the feed, but their texture is usually too fine to have ‘structure effect’ on the digestive tract.