Abstract
The objective of this study was to develop a simulation model for a beef cattle system, in order to carry out an economic analysis of the variable costs influenced by the use of technologies that aim to increase the pregnancy rate of this system and thus, to show whether the Pregnancy rates resulting from a greater intensification of the system coincide with the best economic responses, among the evaluated scenarios. The results were obtained through the elaboration of herd evolutions with different pregnancy rates and cost/animal analysis of each technology used in the system (early weaning, temporary weaning and improved native pasture), aiming at obtaining the enjoyment and variable costs in different scenarios, in order to compare and describe the data. The variation in the pregnancy rate indicated different values for the enjoyment of the system, from 65 to 85%, corresponding to 100 and 116 kg/ha/year, respectively, while the pregnancy rates of 90 and 95% reflected approximate values of 113 and 112 kg/ha/year, respectively. It is concluded that the highest pregnancy rates did not coincide with the highest economic result.
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