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Avaliaram-se os efeitos de cinco níveis de concentrado na matéria seca (25,0; 37,5; 50,0; 62,5; e 75,0%) e dois métodos de balanceamentos de rações sobre os pesos dos órgãos, das vísceras e do conteúdo do trato gastrointestinal (CTGI) de 45 bovinos F1 Limousin x Nelore, com 14 meses de idade e peso vivo médio inicial de 330 kg. O primeiro método de balanceamento tendeu a ser isoprotéico, com aproximadamente 12% de proteína bruta na matéria seca, e o segundo procurou atender às exigências de proteína metabolizável dos animais. Os animais receberam alimentação à vontade até atingir o peso de abate preestabelecido de 500 kg. Foi utilizado o feno de capim-coastcross como fonte de volumoso na dieta. O delineamento foi o inteiramente casualizado, em esquema fatorial 5 x 2, com quatro repetições. Os balanceamentos foram igualmente efetivos, não interagindo com níveis de concentrado. Os pesos do CTGI e omaso diminuíram e os de fígado e gordura interna aumentaram linearmente, com a elevação dos níveis de concentrado. Os demais parâmetros não foram influenciados. An experiment was conducted to evaluate the effects of five concentrate levels as dry matter basis (25.0, 37.5, 50.0, 62.5 and 75.0%) and two diet balance methods on the digestive tract, internal organs weight and gastrointestinal fill of 45 crossbred F1 Limousin x Nelore young bulls, averaging 14 months of age and initial live weight of 330 kg. One diet balance method was almost isoprotein with 12% of crude protein and the other was attempted to attend the metabolizable protein requirements of animals. The animals were full fed up to the slaughter weight of 500 kg. The coastcross grass hay was used as roughage source in the diet. A completely randomized design in a 5 x 2 factorial arrangement, with four replicates, was used. The two diet balance methods resulted in equal animal performances and any connect with concentrate levels was found. The gastrointestinal fill and omasum weight decreased and liver and internal fat weight linearly increased as concentrate levels increased. The others parameters were not influenced by the concentrate levels

Níveis de Concentrado na Dieta de Bovinos F1 Limousin x Nelore: Peso dos Órgãos Internos e Trato Digestivo