Effect of processing on the nutritive value of cereals in animal feeds

Abstract

Since cereals provide much of the digestible energy and considerable amounts of the protein in feeds for livestock, effects of the processing to which they are subjected are of considerable practical significance. In most developed countries, a substantial proportion of the total supply of cereals is used for feeding livestock. In the United Kingdom, the Home Grown Cereals Authority have estimated that of the 22 million tons of imported and home-produced wheat, barley, oats and maize available in 1969-70, over 13 million tons were used in animal feed (Sturgess & Reeves, I 972).Unlike human foods, economic considerations are paramount and organoleptic factors are of relatively little importance in processing cereals for livestock. Processing costs can only be incurred if they are accompanied by a more than commensurate increase in the value of the cereal. I n consequence, most of the cereals used are subjected to relatively simple processes. Recently, however, there has been increasing interest in more sophisticated processing techniques, supported by the increasing economic value of cereals and animal products and the increasing size of unit in animal production enterprises.The following factors have to be considered in any study of processing (I) species of cereal and variation within the species; ( 2 ) the particular process or processes applied; ( 3 ) species and class of animal fed; (4) relative place of the cereal processed with respect to the rest of the diet of the animal.Apart from the problems posed by the variation in the reaction of theanimal, which is often not sufficiently well-defined to allow clearcut definitions of requirements for processing, there can be appreciable differences in the physico-chemical properties within each species of cereal grain, which can interact with the process. Furthermore, the processes are often poorly controlled and their effects upon the physical and chemical properties of the grain are not completely understood. It is therefore not surprising that there is often considerable contradiction in the results relating to the application of a particular process to a particular cereal fed to a given category of animal.Four processes are considered in this paper.https://www.cambridge.org/core/terms. https://doi

Die Bedeutung der Protozoen im Pansen von Hammeln für Verdaulichkeit, N‐Bilanz und N‐Fraktionen in Kot und Harn bei unterschiedlichen Gehalten und Arten von Stärke in der Ration

“…Durch den Einsatz von Quellstarke anstelle von nativer Starke wird der Abbau der Starke im Pansen bedeutend gefordert (BURT 1973;GALYEAN et al 1976), da die Quellstarke im Gegensatz zur nativen Starke vie1 besser fur Bakterien verfiigbar ist (ORSKOV et al 1969). Dieser Unterschied gleicht sich jedoch im Diinndarrn mehr oder weniger wieder aus, so daB sich in der Gesarntverdaulichkeit der Starke nur geringe Unterschiede ergeben (z.…”