The article presents results of modeling and operational evaluation of specific energy consumption in four pig breeding categories, which have been realized under the project QF 3200 „Expert System for Determination Support and Optimization of Technology Processes Control in Agricultural Production“ supported by Czech Ministry of Agriculture. The first step of solution brought mathematical equations that describe physical relation of specific energy consumption to machine input, technology cycle duration, total efficiency and day time operation. As example of energy requirements of material manipulation during feeding operation, mulch treatment are presented in equations 1 to 4. Following performed analysis based on calculated and operationally proved energy consumptions were created simple mathematical equations (tab. I) that qualify relation of specific energy consumption Q [Wh∙d-1∙ks-1] to recommended or standardized values of dry pasture mkr [kg∙d-1∙ks-1], wet pasture mkr,v [kg∙d-1∙ks-1], specific mulch production mmr [kg∙d-1∙ks-1], liquid manure mk [kg∙d-1∙ks-1], stable area S1,u [m2∙ks-1], disinfected area S1,z [m2∙ks-1], technology cycle duration τTC [d] and average animal weight mz [kg-1∙ks-1]. The elementary mathematical models come out from hypothesis that individual operation and technology cycles of agricultural production is possible to optimize on the base of theoretical knowledge adjusted by real ...