HOUSING SYSTEMS BIOSECURITY HOUSING & BROODING EARLY MANAGEMENT LIGHTING NUTRITION HEALTH HATCHING EGG MANAGEMENT 83 83 LOHMANN › MANAGEMENT GUIDE EXAMPLES OF FIBROUS RAW MATERIALS DIGESTIVE SYSTEM Development of morphology and functionality of the gizzard The incorporation of NDF supports the proper functioning of the gizzard, an organ that regulates intestinal transit, in addition to increasing its size. Although the particle size of the feed also contributes to the muscular development of the gizzard, its impact is less than that of insoluble fibre. 50% 70% 50% Low feed intake capacity Poor feed homogeneity, pelleted feed high M. Energy, low insoluble fibre inclusion Adequate feed intake capacity As a consequence of low M. Energy level & insoluble fibre inclusion + feeding pattern 30 % Examples of a gizzard development and proportion between proventriculus and gizzard FIBRE Until several decades ago, fibre was regarded as a component of diets that was not digested or absorbed, and could be fermented in the intestine. It was also classified as an antinutritional factor and a dietary diluent. This consideration was partly based on the chemical definition of crude fibre, which did not define its different components and their physicochemical characteristics. Currently, the concept of dietary fibre (non-starch polysaccharides + lignin) better represents the fibre fraction than the crude fibre concept that was developed in Germany in the 19th century. Nevertheless, dietary fibre has not been extensively developed in poultry nutrition, and crude fibre remains a consideration in most feed formulations. Meanwhile, LOHMANN BREEDERS considers that neutral detergent fibre (NDF) values better represent the insoluble fibre fraction since crude fibre analysis undervalues the true value of the insoluble fibre fraction. Nutrient Digestibility Insoluble fibre increases the content of the gizzard and increases the retention time of the digesta, which translates into better nutrient digestibility and greater feed efficiency. Effect on Excreta Quality The inclusion of dietary fibre (insoluble fibres), such as oat hulls, reduces the moisture content in the faeces. This is because insoluble fibre improves digestive function and nutrient absorption, which also increases the dry matter content in the litter. Effect on Behaviour Diets with moderate NDF content reduce pecking, improving feather condition because pullets and hens spend more time at the feeder and experience greater satiety. NDF
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