RESUMO:Objetivou-se com este trabalho fazer uma revisão acerca da importância da determinação das exigências nutricionais de bovinos. As principais exigências a serem determinadas são de proteína, energia e minerais as quais podem ser subdivididas em exigências para mantença e para ganho. A determinação dessas variáveis pode ser feita pelo abate comparativo ou calorimetria animal. No Brasil, a técnica mais amplamente utilizada é o abate comparativo e há apenas dois trabalhos que utilizaram a calorimetria para mensuração de exigências de energia em bovinos. Comparando-se essas duas metodologias, cabe destacar a grande desvantagem do abate comparativo: o elevado custo devido à perda do animal. Apesar do número considerável de trabalhos acerca do tema, ainda são necessários um volume maior de trabalhos com as raças mais utilizadas no Brasil. Além disso, há uma carência de dados de exigências nutricionais determinadas pela técnica da respirometria calorimétrica. Palavras-chave: abate comparativo, respirometria, ruminantes, zebuNutritional requirements of cattle: a tool productivity of favor ABSTRACT: The objective of this study was to conduct a review of the importance of determining the nutritional requirements of cattle. The main requirements to be determined are protein, energy and minerals which can be subdivided into requirements for maintenance and gain. The determination of these variables may be done by comparing the slaughter animal or calorimetry. In Brazil the most widely used technique is the comparative slaughter and only two studies that used calorimetry to measure energy requirements in cattle. Comparing these two methods, it highlights the major drawback of comparative slaughter: the high cost due to the loss of the animal. Despite the considerable number of works on the subject are still needed a higher volume of work with the races most used in Brazil. In addition, there is a lack of data nutritional requirements determined by the technique of calorimetry respirometry.
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