RESUMO -Com o objetivo de avaliar diferentes níveis de bagaço e uréia como substituto ao farelo de soja em dietas para bovinos leiteiros em crescimento, dois experimentos foram realizados. No primeiro, 20 bezerros mestiços Holandês x Zebu foram distribuídos em quatro tratamentos em delineamento inteiramente casualizado. Os animais receberam dietas à base de palma forrageira e bagaço de cana em níveis de 5,5; 14,4; 24,4 e 34% da matéria seca total. O ganho de peso diminuiu, enquanto a conversão alimentar, e os consumos de FDN e FDA aumentaram linearmente com a inclusão de bagaço. O consumo máximo de MS foi estimado em 2,73% do peso vivo com 30% de bagaço de cana. No segundo experimento foi avaliada a substituição do farelo de soja (FS) por uréia mais milho moído (UM), em dietas à base de palma forrageira, sobre o desempenho de novilhas mestiças Holandês x Zebu. Vinte animais foram alimentados de acordo com os níveis de substituição do FS por UM (0, 20, 40 e 60%) distribuídos em blocos ao acaso. Não houve efeito da substituição parcial do farelo de soja por milho e uréia sobre o desempenho de novilhas mestiças.Palavras-chave: consumo de alimentos, conversão alimentar, ganho de peso, palma forrageira Sugar Cane Bagasse and Urea as Replacement of Soybean Meal in the Growing DairyCattle Diets ABSTRACT -In order to evaluate different levels of sugar cane bagasse and urea as replacement of soybean meal in growing dairy cattle diets, two trials were conducted. In the first, twenty crossbreed bull calves (Holstein x Zebu) were allotted in a completely randomized design with four treatments. The animals were fed forage cactus based diets, containing levels of 5.5, 14.4, 24.4 and 34% of sugar cane bagasse on the dry matter basis. The liveweight gain decreased while the feed: gain ratio, FDN and FDA intakes increased linearly in function of the increased level of sugar cane bagasse. The maximum daily dry matter intake of 2.73% of LW was estimated with 30% of sugar cane bagasse in the diet. In the second, was evaluated the partial replacement of soybean meal (SM) by urea plus corn cracked (UC) in forage cactus based diets on the crossbreed (Holstein x Zebu) heifers performance. Twenty animals were fed diets containing four levels (0, 20, 40 and 60%) of replacement of SM by UC. There was no significant effect of partial replacement of soybean meal by urea plus corn cracked on crossbreed heifers performance.
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