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 SymposiumREQUIREMENTS ON QUALITY FEEDS AND THEIRASSESSMENT FROM VIEW OF ACTUAL KNOWLEDGEMária Chrenková, Ľubica Chrastinová, Zuzana Čerešňáková, Mária PolačikováAnimal Production Research Centre, Hlohovecká 2, 951 41 Lužianky, Slovak RepublicABSTRACTQuality <strong>of</strong> feeds is important not only for livestock efficiency but also for production <strong>of</strong>animal products. Therefore it is necessary to study the properties <strong>of</strong> feeds. Biological <strong>and</strong>chemical methods are used for this purpose <strong>and</strong> tests on animals are preformed todetermine nutritive value, degradability <strong>and</strong> digestibility in feeds. Quality <strong>of</strong> feedsinfluences animal products, economy <strong>and</strong> environment. Therefore it is necessary toextend knowledge <strong>of</strong> nutritive value <strong>of</strong> feeds <strong>and</strong> nutrient <strong>and</strong> energy requirements byanimals.Key words: requirements on feed quality, methods <strong>of</strong> feed evaluation <strong>and</strong> efficiency <strong>of</strong>their utilizationINTRODUCTIONProduction <strong>of</strong> sufficient amount <strong>of</strong> feeds in desirable quality <strong>and</strong> structure influences to adecisive degree not only livestock efficiency but also requisite quality <strong>of</strong> animal productsfor human nutrition. Quality <strong>of</strong> feed is represented by content <strong>of</strong> nutrients, concentration<strong>of</strong> energy as well as by <strong>dietary</strong> properties, properties influencing feed intake (physicalform, course <strong>of</strong> fermentation, specific taste substances, degree <strong>of</strong> contamination,proportion <strong>of</strong> antinutritive or toxic substances, etc.). We can come to objectiveassessment <strong>of</strong> quality only after taking into account whole range <strong>of</strong> parameters, whichare, however, not <strong>of</strong> the same value. Therefore it is necessary to assess eachcharacteristic property <strong>of</strong> feed separately <strong>and</strong> to determine qualitative limits with regardto type <strong>of</strong> feed on the basis <strong>of</strong> minimum requirements on the studied parameters.High <strong>and</strong> stable yields, high content <strong>of</strong> energy <strong>and</strong> other nutrients, high digestibility <strong>and</strong>utilization <strong>of</strong> energy <strong>and</strong> other nutrients, increased degradability <strong>of</strong> potentially utilizablestructural saccharides, low content <strong>of</strong> antinutritive substances [2] are necessary forproduction <strong>of</strong> feeds for animal nutrition.MATERIAL AND METHODSBiological <strong>and</strong> chemical methods as well as biological <strong>and</strong> production tests on animalsare used to determine nutritive value in concentrates <strong>and</strong> roughage, degradability <strong>and</strong>digestibility <strong>of</strong> feeds; mathematic-statistical modelling is used to formulate predictionequations <strong>of</strong> nutrient dem<strong>and</strong>s <strong>and</strong> development <strong>of</strong> information database systems <strong>of</strong>nutritive value in feeds.66
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