Effects of dietary n-3 polyunsaturated fatty acids and ... - FINS
Effects of dietary n-3 polyunsaturated fatty acids and ... - FINS
Effects of dietary n-3 polyunsaturated fatty acids and ... - FINS
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1 st WorkshopXIII International Feed Technology SymposiumRESULTS AND DISCUSSIONHowever, evaluation <strong>of</strong> feeds quality must be primarily founded with objectiveparameters assessed by chemical analysis <strong>of</strong> feeds. Although the classical analysis, theso-called Weenden’s system, is still the basis for feed analyses, it is not sufficient forobjective assessment <strong>of</strong> feed quality today (fig. 1). In new applied systems <strong>of</strong> feed <strong>and</strong>nutrients need assessment for individual species <strong>and</strong> categories <strong>of</strong> farm animals(Petrikovic <strong>and</strong> Sommer) is introduced a number <strong>of</strong> new quality <strong>and</strong> nutritive valueparameters, which were not studied in practice till now. It is degradability <strong>of</strong> nutrients<strong>and</strong> intestinal digestibility <strong>of</strong> their non-degradable portion in ruminants.Fig. 1. Wenden’s system <strong>of</strong> feed analysisDevelopment, introduction <strong>and</strong> tests <strong>of</strong> these systems <strong>of</strong> feed assessment are closelyconnected with intense increase in production intensity <strong>and</strong> conditioned by veryintensive development <strong>of</strong> new experimental methods, techniques, analytical processes.More <strong>and</strong> more accent is laid on fractional composition <strong>of</strong> basic nutrients (saccharides,crude protein, fats). In the sphere <strong>of</strong> feeds evaluation a change to parameters takes place,which express better the real biological utilization <strong>of</strong> individual nutrients. All thisnecessitated principal revision <strong>of</strong> valid recommendations in order to correspond topresent state <strong>of</strong> knowledge about processes, which are connected with change <strong>of</strong>nutrients in animal organisms, <strong>and</strong> about factors that influence it.Gaining new knowledge in the sphere <strong>of</strong> biochemistry <strong>and</strong> physiology <strong>of</strong> nutrition isdecisive for elaboration <strong>of</strong> recommendations <strong>of</strong> energy <strong>and</strong> nutrients needs for individualspecies, categories <strong>and</strong> production orientation <strong>of</strong> animals, with regard to physiologicalstate, way <strong>of</strong> breeding <strong>and</strong> environment. Principal problem is to assess need <strong>of</strong> energy,because energy is necessary in all processes, which take place within metabolism inorganism. Need for other nutrients (crude protein, amino <strong>acids</strong>, some <strong>fatty</strong> <strong>acids</strong>, macro<strong>and</strong>micro elements, vitamins) are as a rule put in connection with feed (per kg SDM),animal (per day) or content <strong>of</strong> energy in feed (per 1 MJ). The matter <strong>of</strong> question in67
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