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Dietary protein reduction in combination with simultaneous supply of limiting amino acids reduces environmental load with nitrogen and helps to save feeding costs. To take full advantage of low protein diets, the energy supply must also be taken into account. With high protein diets, excess absorbed amino acids are converted into nitrogenous waste which is excreted through urine and faeces into the environment. The goal of the present study is to investigate the effect of a crude protein reduction under different energy levels with consideration of the ideal-protein on zootechnical and slaughter performance, as well as carcass characteristic parameters of fattening pigs.

Fibre supplementation in piglets and sow nutrition is of special interest as it is a prerequisite to improve gut health and animal performance. It plays an essential role in feeding strategies targeting the replacement of antimicrobials as growth promotors. Feeding recommendations for fibre require the characterisation of feed materials used for diet formulation regarding quality and quantity of fibre. Current research results indicate that new evaluation parame-ters based on dietary fibre can replace the outdated “crude fibre” evaluation system. This pilot study in cooperation with Brazil and Vietnam aims to sample and to analyse typical feed ma-terials (ingredients) used in pig diets in these countries, with the target to improve feed formu-lations and to support the customers in developing feeding strategies for replacing the use of antimicrobials as growth promotors.

Alternative protein sources for animal nutrition contribute to improve the efficiency of animal nutrition in Austrian farms and in aquaculture. Imports of soybean from South America are the main source of protein at the moment. Looking for sustainable agricultural production, new protein sources have to be investigated. The production of larvae of the black soldier fly show a large potential to contribute to minimize the negative Effekts of protein imports.

Supervised Theses and Dissertations