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• A growth model to predict body weight and body composition of broilers

  17-24

  Galyna Dukhta

  Jaap van Milgen

  György Kövér

  Veronika Halas

  Views:

  331

  Models predicting the nutrient partitioning and animal performance have been developed for decades. Nowadays, growth models are used in practical animal nutrition, and they have particular importance in precision livestock farming. The aim of the present study was to introduce a broiler model and to provide examples on model application. The model predicts protein and fat deposition as well as the body weight of an individual broiler chicken from digestible nutrient intake over time. Feed intake (FI) and the digestible nutrient content of the feed are inputs as well as some animal factors like: initial BW, feed intake at 1 and 2 kg of BW, precocity and mean protein deposition. The protein and energy metabolism is represented as in the classical nutrient partitioning models. The protein deposition (PD) is driven by digestible amino acid supply and is under “genetic control”, the so-called potential PD limits the actual PD if protein is oversupplied.

  The authors discuss how the model can be used to simulate the animal response upon different scenarios. Examples are given to show that the diet might be limiting if some animal trait is changed. Applicability of the model has shown through running the model by using different feed strategies (three- vs five-phase-feeding) and variations with animal factors. In conclusion, growth models are useful tools to support decision making for defining the most suitable feeds used in a broiler farm. The model presented in this paper shows a high sensibility and flexibility to test different scenarios. By challenging the model with different inputs, the animal response in terms of changes in body weight and feed conversion can be understood more by studying the shift in deposition of chemical constituents. The examples provided in the present paper shows the benefit of using mathematical models and their applicability in precision nutrition. It can be concluded that the growth model helps to apply “from desired feed to desired food” concept.

• Research of the interrelations between actors and strategic goals in decision making

  71-75

  Sándor Somogyi

  Nebojša Novković

  Čulibrk Zoran

  Views:

  53

  management, although there are many chiseled methodologies plenty of professional literature. 
  The problem is more complex in strategic planning of regional communities – societies – of different range. These societies are very diverse, and accordingly the strategic goal setting can, and has to be very different than the strategic goal setting of enterprises.
  The group of methods for morphologic and structural analysis and the computer based MACTOR program could be used.
  The output data are presented in a large number of matrixes, vectors, graphs and histogram’s, which describe very fair the possible scenarios for preparation and decision making about
  strategic plans.

• Defining agricultural cluster’s conceptual framework with Delphi technique

  63-66

  Péter Micskei

  Views:

  116

  The cluster concept is well defined in the literature, but its agricultural adaptation has not been detailed. A method is needed, which involves 
  experts into the study, who are able to confirm that the modell is correct and help to define the conceptual gaps. The Delphi technique is suitable
  for the task. This is a well-structure, iterative future foresight technique, based on experts opinion about the research topic. The method leads to consensus by all means, but it also can have a negative outcome of the researcher's point of view, that's why we have to formulate scenarios.
  The aim is not statistically significant result, but to build in new ideas into the modell with brainstorming.

• Spent mushroom compost (SMC) – retrieved added value product closing loop in agricultural production

  185-202

  Agnieszka Jasińska

  Views:

  910

  Worldwide edible mushroom production on agro-industrial residues comprises of more than 11 million tons of fresh mushrooms per year. For 1 kg of mushrooms there is 5 kg of spent mushroom compost (SMC). This enormous amount of waste results in disposal problems. However, SMC is a waste product of the mushroom industry, which contains mycelium and high levels of remnant nutrients such as organic substances (N, P, K). The spent mushroom compost is usually intended for utilization, but there are increasing numbers of experiments focusing on its reuse in agricultural and horticultural production. Recently, the increase of the global environmental consciousness and stringent legislation have focused research towards the application of sustainable and circular processes. Innovative and environmentally friendly systems of utilisation of waste streams have increased interest of the scientific community. Circular economy implies that agricultural waste will be the source for retrieving high value-added compounds. The goal of the present work was to carry out a bibliographic review of the different scenarios, regarding the exploitation of this low cost feedstock with huge potential for valorisation.