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Novák P., L. Zeman, K. Ko‰afi, L. Novák: Modelling of Body Mass Increase and Feed Conversion Ratio in Chickens ROSS 208 . Acta Vet. Brno 2004, 73: 17-22. The fattening efficiency evaluation in broilers, expressed in the European Efficiency Factor (EEF index) requires the information on mortality rate, body mass and feed conversion ratio reached at the age of their delivery to slaughter. This requirement is met by the use of the deterministic simulation model BIOM N 2001. In contrast to the contemporary widely used models of growth that describe the body mass growth as a function of time, the BIOM N 2001 model is based on the conversion of metabolizable feed energy into the gross energy deposited in the tissues of a growing warm-blooded animal. The results, obtained in an experiment with broiler chickens ROSS 208, demonstrate the formal compatibility of this new methodical approach with the classical growth function of Gompertz. The advantage of this new method is its compatibility with variables, generally used at well performing farms in the course of the fattening period, i.e. good agreement between the calculated values and those measured in an experiment, namely the amount of feed consumed under the measured climatic conditions of the breeding hall, the body mass of broilers (females - 2 374 g, males - 2 696 g), their age at slaughter maturity, and the feed conversion ratio. Taking into account the actual mortality of the flock it is easy to calculate the EEF index and to use the BIOM N 2001 model for the solution of prognostic or diagnostic tasks.