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Due to the dynamic evolution of food chains during the past years, currently available chain models are no longer able to meet the needs of operators. This article introduces a model for chain analysis which is used in an analysis of the supply chains of the entire Italian production of Animal Origin which constitute a complex network in which the actors of the agro-food system operate. The new model is innovative for two reasons: it represents many supply chains of products of animal origin from different productive species in a single model and, in addition, allows to represent the complexity of the chain network.


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