Background: The amount of parenteral protein to produce nitrogen balance in infants diagnosed with severe heart defects undergoing cardiopulmonary bypass surgery was investigated. Methods: Infants born at ≥36 weeks and ≤ 12 months of age were randomized to one of three parenteral protein intakes, the control group received 1.5 g/kg/d and intervention groups received either, 2.2 or 3.0 g/kg/d of protein, respectively. Timed 24 hour urine collections were obtained for three consecutive days following surgery. Total urinary nitrogen was measured through Kjeldahl analysis. Results: A significant difference was demonstrated between the lowest protein intake level of 1.5 g/kg/d and both 2.2 g/kg/d (p ≤ 0.03) and 3.0 g/kg/d (p ≤ 0.001), on study day 1. Nitrogen balance results were 4.0 ± 52.9 (1.5 g/kg/d), 97.0 ± 96.2 (2.2 g/kg/d) and 149.7 ± 90.9 (3.0 g/kg/d). Conclusion: Protein delivery of 1.5 g/kg/d was insufficient to produce nitrogen balance on post-operative day 1.

Background: The amount of parenteral protein to produce nitrogen balance in infants diagnosed with severe heart defects undergoing cardiopulmonary bypass surgery was investigated. Methods: Infants born at ≥36 weeks and ≤ 12 months of age were randomized to one of three parenteral protein intakes, the control group received 1.5 g/kg/d and intervention groups received either, 2.2 or 3.0 g/kg/d of protein, respectively. Timed 24 hour urine collections were obtained for three consecutive days following surgery. Total urinary nitrogen was measured through Kjeldahl analysis. Results: A significant difference was demonstrated between the lowest protein intake level of 1.5 g/kg/d and both 2.2 g/kg/d (p ≤ 0.03) and 3.0 g/kg/d (p ≤ 0.001), on study day 1. Nitrogen balance results were 4.0 ± 52.9 (1.5 g/kg/d), 97.0 ± 96.2 (2.2 g/kg/d) and 149.7 ± 90.9 (3.0 g/kg/d). Conclusion: Protein delivery of 1.5 g/kg/d was insufficient to produce nitrogen balance on post-operative day 1.

Twenty-four Quarter horse weanlings (120 d +/- 10 d) were blocked by age into 4 groups (n = 6) for a 56 d trial to evaluate the influence of methionine on growth and nitrogen retention. Weanlings were housed by block and individually fed 1 of 4 concentrate diets twice daily at 1.5% BW (as fed). Weanlings were randomly assigned to 1 of 4 treatments: basal (0.20 MET), basal + 0.03% methionine (0.23 MET), basal + 0.07% methionine (0.27 MET), and basal + 0.11% methionine (0.31 MET). Diets were formulated to be isonitrogenous, isocaloric, and contain equal amounts of LYS and THR. Coastal bermudagrass hay was individually fed at 0.75% BW (as fed). Growth measurements, body weight, rump fat, and plasma were obtained every 7 d. The final 4 days consisted of total collection of urine and feces. Feed, fecal, and urine samples were analyzed for nitrogen content and nitrogen balance was calculated. Urine was analyzed for urea and ammonia concentration. Plasma was analyzed for urea concentration. Grain, hay, and fecal samples were analyzed for nutrient composition. Data were analyzed using the PROC MIX procedure of SAS. Linear, quadratic, and cubic effects were tested in the form of contrasts. There was no influence of treatment on growth measurements, nitrogen balance, or urinary urea or ammonia. Intake of LYS and THR (g/d) did not differ among treatments (P = 0.78 and P = 0.38 respectively). Plasma urea nitrogen (PUN) was influenced by treatment (P = 0.005) exhibiting quadratic (P = 0.04) and cubic (P = 0.002) effects. An unexpected peak in PUN was observed with 0.27 MET. Upon analysis, 0.20 MET contained more lysine than formulated, and 0.27 MET contained the least lysine. Treatments 0.20 MET and 0.31 MET contained more threonine compared to formulations. These differences may explain unexpected values of PUN concentration. Results suggest future studies that more closely isolate methionine as the only dietary variable are necessary to better explain the methionine requirements of weanling horses.

Short-rotation woody crops are becoming important supplies of hardwood fiber, but little is known about the early nutritional needs of these systems, especially on different site types. The study objectives were, on two young (ages 3-6) sweetgum plantations with contrasting soil types, to 1) determine the plant growth and foliar nutrition response to repeated nitrogen (N) fertilizer applications, 2) determine soil N supply, plant N demand, foliar N resorption, and soil and fertilizer uptake efficiencies, and 3) test a simple N supply model. In order to expand the findings to the range of sweetgum site types, the study objectives were also to 4) evaluate rapid methods for determining N mineralization potential, 5) characterize the soils of 14 sweetgum site types in the Atlantic coastal plain, and 6) review current N fertilizer prescriptions in forestry and recommend strategies for improvement. Two young sweetgum (Liquidambar styraciflua L.) plantations on a converted agricultural field and a pine cutover site in South Carolina were fertilized biannually with three rates of N fertilizer (0, 56, 112 kg N per ha). Fertilization doubled foliar biomass and leaf area on the cutover pine site in the years fertilizer was applied, and stem biomass increased 60%. Critical values, the N concentration required for 90% of optimum growth, is approximately 1.75%. Foliar N uptake increased at both sites when fertilizer was applied. Modeled annual soil N supply was within 20% of that measured on the two plantations even though monthly N supply was not accurately estimated. Potential N mineralization was accurately estimated with a 3-day incubation of rewetted soils that were previously dried, but not by hot salt extraction or anaerobic incubation. Across a spectrum of 14 sweetgum sites, the agricultural fields had lower mineralizable nitrogen (126 kg per ha) than the cutover sites (363 kg per ha). Current N fertilizer prescriptions are not sufficient for repeated fertilizer applications to fast-growing hardwood plantations, but simple models of soil N supply and an N-balance approach may improve prescriptions. / Ph. D.

No description available.

Dois experimentos foram realizados para avaliar o efeito da alimentação sequencial (AS) no desempenho e metabolismo energético e proteico de frangos de corte e suínos em crescimento. No primeiro experimento foram utilizados 144 frangos de corte com 21 dias de idade, alojados em baterias de metabolismo. As dietas A e B foram formuladas para atender 100% e 80% das recomendações de aminoácidos digestíveis, respectivamente. Os tratamentos utilizados foram: Tratamento AA, dieta A, fornecida durante todo o ciclo de 24 horas; Tratamento AB, dieta A fornecida durante o dia e dieta B fornecida durante a noite; Tratamento BA, dieta B fornecida durante o dia e dieta A fornecida durante a noite e; Tratamento BB, dieta B fornecida durante todo o ciclo de 24 horas. No experimento com suínos foram utilizados 16 animais com peso inicial de 30 kg, alojados em gaiolas metabólicas. Os tratamentos e as dietas experimentais seguiram as mesmas proposições do experimento com aves, porém com parâmetros nutricionais ajustados para suínos. Os frangos submetidos à AS apresentaram desempenho semelhante à dieta completa, com ligeira piora na conversão alimentar. Os frangos de corte dos tratamentos com AS ingeriram menos energia, nitrogênio (N) e lisina comparadas aos animais alimentados exclusivamente com a dieta A. Os valores de retenção e excreção de N nos frangos alimentados sob regime de AS compararam-se ao tratamento AA. O tratamento BA excretou menos N e obteve uma relação de retenção de N por quilograma de peso vivo equivalente ao tratamento AA. Em suínos, não foram detectados efeitos da AS sobre o peso final, consumo de ração diário, ganho de peso diário e conversão alimentar. A ingestão de N foi influenciada pela AS, mas não houve diferença na excreção e retenção de N, comparado ao tratamento AA. Os programas de AS apresentam desempenhos similares com reduzida ingestão de nutrientes e retenções de N similares a programas de alimentação convencionais em frangos de corte. AAS mantém o potencial de retenção de nitrogênio de uma dieta convencional, sem alterar os coeficientes de digestibilidade da dieta e o desempenho zootécnico. O fornecimento da dieta deficiente em aminoácidos durante o período da noite parece ser a melhor escolha para otimizar retenção de nitrogênio ao aplicar a estratégia de alimentação sequencial em suínos. / Two experiments were carried out to evaluate the effect of sequential feeding (AS) on performance and energy and protein metabolism of broiler chickens to growing pigs. In the experiment in birds were used 144 broiler chickens with 21 days of age, housed in metabolism batteries. Diets A and B were formulated to meet 100% and 80% of digestible amino acid recommendations, respectively. The treatments utilized were: Treatment AA, diet A, provided throughout the 24-hour cycle; AB treatment, A diet provided during the day and diet B provided overnight; Treatment BA, diet B provided during the day and diet A provided at night and; Treatment BB, diet B provided throughout the 24 hour cycle. In the experiment with pigs were used 16 animals with initial weight of 30 kg, housed in metabolic cages. The treatments and the experimental diets followed the same propositions of the experiment with birds, however with nutritional parameters adjusted for pigs. The birds submitted to AS presented similar performance to the complete diet, with a slight worsening in feed conversion. The birds in the AS treatments ingested less energy, nitrogen (N) and lysine compared to birds fed exclusively on diet A. The N retention and excretion values in the birds fed under AS regimen were compared to the AA treatment. The BA treatment excreted less N and had a N retention ratio per kilogram live weight equivalent to the AA treatment. In pigs, no effects of AS and final weight, daily feed intake, daily weight gain and feed conversion were detected. N intake was influenced by AS, but there was no difference in N excretion and retention compared to AA treatment. AS programs perform similar performances with reduced nutrient intakes and N retention similar to conventional feeding programs in broilers. AS maintains the nitrogen retention potential of a conventional diet without altering the digestibility coefficients of the diet and the zootechnical performance. The supply of the amino acid deficient diet over night appears to be the best choice to optimize nitrogen retention by applying the sequential dietary strategy.

Orientador: Mauro Dal Secco de Oliveira / Banca: Jane Maria Bertocco Ezequiel / Banca: Atushi Sugohara / Banca: André de Faria Pedroso / Banca: Flávia Fernanda Simili / Resumo: Este estudo objetivou avaliar o armazenamento da cana-de-açúcar hidrolisada com 0,5% de cal hidratada sobre o consumo das frações alimentares, desempenho animal, viabilidade econômica, comportamento ingestivo, características nutritivas da forragem e aspectos da digestão de novilhas confinadas. Foram realizados dois experimentos. No primeiro (Capítulo 2 e 3), foram utilizadas 24 novilhas da raça Nelore distribuídas inteiramente ao acaso nos tratamentos formados por dietas com cana-de-açúcar in natura (tempo zero), cana-de-açúcar hidrolisada e armazenada por 24, 48 ou 72 horas. No segundo (Capítulo 4), foram utilizadas quatro novilhas da raça Nelore delineadas num quadrado latino 4x4, onde foram avaliadas as dietas anteriormente descritas. No primeiro experimento, verificou-se variação cúbica (P < 0,05) em função do tempo de armazenamento da cana-de-açúcar da maioria das variáveis relacionadas ao consumo das frações alimentares e desempenho animal, apresentando melhores resultados para novilhas alimentadas com cana-de-açúcar in natura. O armazenamento da cana-de-açúcar até 72 horas proporcionou aumento linear (P < 0,05) da fração de carboidratos potencialmente degradáveis e diminuição dos custos de produção. Novilhas alimentadas com dietas a base de cana-de-açúcar in natura apresentaram maior tempo de ruminação (P < 0,05). No segundo experimento, verificou-se que o consumo e digestibilidade dos nutrientes, o balanço de nitrogênio, a eficiência de síntese de proteína microbiana e o nitrogênio amoniacal não foram influenciados (P > 0,05) pelas dietas. O armazenamento da cana-de-açúcar com adição de 0,5% de cal hidratada até 72 horas deprime o consumo e desempenho de novilhas jovens da raça Nelore / Abstract: This study evaluated the effect of storage of hydrolyzed sugarcane with .5% hydrated lime the dietary fractions intake, animal performance, economic viability, ingestive behavior, nutritional characteristics of forage and digestion aspects of confined heifers. Two experiments were conducted. In the first (Chapter 2 and 3), 24 Nellore heifers were used and randomly distributed in treatment formed by diets constituted by fresh sugarcane (zero time), hydrolyzed sugarcane and stored for 24, 48 or 72 hours. In the second (Chapter 4), four heifers were used constituting a 4x4 latin square, with similar diets previous. In the first experiment, there was variation cubic (P < .05) according the storage time of most variables related to dietary fractions intake and animal performance, with better results for heifers fed with fresh sugarcane. Storage of sugarcane until 72 hours promoted linear increased (P < .05) in the carbohydrate fraction potentially degradable and decreased production costs. Heifers fed diets with fresh sugarcane presented higher time ruminating (P < .05). In the second experiment, it was found that the intake and digestibility of nutrients, the nitrogen balance, the efficiency of microbial protein synthesis and the ammonia nitrogen were not affected (P > .05) by diets. The storage of hydrolyzed sugarcane with .5% of hydrated lime up to 72 hours depresses intake and performance of young Nellore heifers / Doutor

Agriculture when only focused on production leads to an unsustainable use of inputs with negative consequences to the environment and human health. One consequence of the excessive use of fertilizers is the pollution of surface and underground water resources in agricultural eco-systems and their boundaries. The Brazilian Cerrado has been suffering the transformations of the intensive agriculture during the last decades. Due to the poor fertility of soils, in general very sandy and of low pH, the use of agricultural inputs is intensified and the nutrient downward transport by leaching becomes a serious problem in different regions. Information about the current use practices of fertilizer use in the Cerrado environment must be gathered for a healthy transition of this biome. Models based on physical and chemical processes are useful tools to simulate water and nutrient dynamics in agricultural systems, including the related losses due to adopted managements. They have the potential to evaluate different scenarios to predict outcomings of such practices. Among the available models for such processes, SWAP (Soil, Water, Atmosphere and Plant model) has been used under several agronomic conditions to describe hydrologic processes, and ANIMO (Nitrogen in Agriculture model) to simulate N cycling in agricultural systems. Our study presents an application of SWAP to adult perennial coffee crops along one productive cycle, with focus on deep drainage losses and irrigation management in a representative Brazilian Cerrado management system. The SWAP/ANIMO combination was used in this study to simulate N absorption by coffee plants and N leaching in the form NO3-N, as a result of an intensive fertilizer management practice. The ANIMO program was calibrated in relation to one N treatment, of 400 kg ha-1 year-1, and was evaluated with independent data of NO3-N in soil solution of another treatment of 800 kg ha-1 year-1. The yearly water balance (WB) obtained from SWAP was similar to that obtained through a sequential climatologic WB of Thornthwaite and Matter. However, the monthly deep drainage values obtained by SWAP as compared to the WB values presented differences with a determination coefficient of 0.77 in a linearization of the results. Irrigation scenarios with intervals of 3(IF3), 5(IF5), 10 (IF10) e 15 (IF15) days between water applications were simulated by SWAP and compared with the irrigation management practiced in the farm where the experiment was carried out. These simulations showed for longer intervals (IF15) drainage losses were smaller, water productivity higher, as well as relative productivity. Measurements of N absorption by plants obtained experimentally were similar to ANIMO simulations. Sensitivity analyses of the model showed that leaching and soil solution concentration of NO3-N are sensitive to soil pH and temperature of the decomposition processes. We conclude that the combination of SWAP with ANIMO was efficient for the description of the N cycle in a Cerrado soil-plant-atmosphere system / A agricultura focada apenas na produção leva ao uso insustentável de recursos resultando em consequências negativas para o meio ambiente e a saúde humana. Uma consequência do uso excessivo de fertilizantes é a contaminação dos recursos hídricos subterrâneos e superficiais em ecossistemas agrícolas e nos seus arredores. Devido o solo da região do Cerrado ser pobre em nutrientes, predominantemente arenoso e com alta acidez, o uso de insumos agrícolas é intensificado e o transporte químico de nutrientes via lixiviação é um problema para a agricultura intensiva nas diferentes regiões. Informações sobre as atuais práticas de uso de fertilizantes e seus efeitos no ambiente de Cerrado precisam ser coletadas para reduzir os impactos da agricultura nesse ecossistema. Modelos baseados em processos físicos e químicos são ferramentas úteis para simular a dinâmica da água e nutrientes no meio agrícola e as perdas associadas aos manejos adotados, com potencial para avaliar diferentes cenários de previsão dos resultados dessas práticas. Entre os modelos baseados em processos, o SWAP (modelo Solo, Água, Atmosfera e Planta) tem sido utilizado com sucesso em várias condições agronômicas para descrever processos hídricos, e o ANIMO (modelo de nitrogênio na agricultura) para simular o ciclo do nitrogênio em sistemas agrícolas. Nosso estudo apresenta uma aplicação do SWAP para culturas de café perenes maduras ao longo de um ciclo produtivo, com foco nas perdas por drenagem e no manejo da irrigação em um sistema típico do Cerrado Brasileiro. A combinação dos modelos SWAP/ANIMO foi utilizada nesse estudo para simular a absorção de N pelas plantas de café e a lixiviação do nitrogênio na forma de nitrato (NO3-N) resultante de uma prática de manejo de fertilizantes intensiva. O ANIMO foi calibrado para o cenário correspondente à aplicação de 400 kg ha-1 ano-1 de fertilizante mineral, e foi avaliado com dados independentes de NO3-N na solução do solo medidos em parcelas de outro tratamento que receberam 800 kg ha-1 ano-1. O balanço hídrico anual obtido pelo SWAP foi semelhante ao obtido pelo balanço sequencial climatológico, de Thornthwaite e Matter. No entanto, os valores mensais de drenagem profunda obtidos pelo SWAP e comparados com os resultados do balanço climatológico apresentaram diferenças, com um coeficiente de determinação de 0,77 na linearização dos resultados. Cenários de irrigação com intervalos de 3 (IF3), 5 (IF5), 10 (IF10) e 15 (IF15) dias entre aplicações de água foram simulados utilizando o SWAP e comparados com a prática de manejo da fazenda onde o estudo experimental foi realizado. As simulações dos cenários com o SWAP mostraram que as irrigações com intervalos mais longos (IF15) apresentam menores quantidades de perdas por drenagem, maior produtividade da água e produtividade relativa da cultura. As medidas de absorção de N pelas plantas obtidas experimentalmente foram similares às estimativas do modelo ANIMO. As analises de sensibilidade do modelo mostraram que as previsões da lixiviação e concentração de NO3-N na solução do solo são sensíveis às variáveis pH do solo e temperatura de referência dos processos de decomposição. Conclui-se que a combinação dos modelos unidimensionais baseados em processos SWAP/ANIMO foi eficaz na descrição do ciclo do N avaliado no sistema solo-planta do Cerrado

Made available in DSpace on 2016-04-28T14:59:46Z (GMT). No. of bitstreams: 1 2007 - Viridiana Basoni Silva.pdf: 2120660 bytes, checksum: 288bfedc4575c16c602010bb3ef36609 (MD5) Previous issue date: 2007-02-14 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / This work was accomplished with aim of evaluate intake and apparent digestibility of nutrients, nitrogen balance, feeding behavior and water balance in lactating goats, fed with diets contend different levels of substitution of the concentrate by wet brewery grains (WBG): 0, 25, 50, 75 and 100%. Five goats Boer x Saanen and five Saanen goats were randomly assigned in two 5x5 Latin squares. The five experimental periods had duration length of 15 days, 10 for adaptation and five days for data and sample collections. The roughage used was tifton hay, in roughage:concentrated rate of 60:40. The animals were allocated in metabolic cages, fed twice a day. For the feeding behavior the feeding times (FT), idle time (IT) and rumination time (RT) were evaluated for each animals every 20 minutes during 24 hours. The dry matter intake (DMI), organic matter (OMI), crude protein (CPI), ether extract (EEI) neutral detergent fiber (NDFI) and total digestible nutrients (TDNI) in g/d and dry matter intake body weight (DMI BW) and neutral detergent fiber intake body weight (NDFI BW) had quadratic effect, diets more consumed were the with levels of substitution of 0 and 25%. The apparent digestibility of the dry matter (DM), organic matter (OM) and total carbohydrate (CT) decreased with linear effect with the increase of the levels of WBG in the diet and the digestibility of CP it had quadratic effect, increasing digestibility to the level of substitution of 25% of WBG of concentrate. The nitrogen balance had decreased linear effect lesser with increasing WBG. The feeding times (FT) and idles times (IT), weren t affected by increasing of levels of WBG in the diet, however, the rumination times and total chewing time had growing linear effect with increase of levels of WBG in the diet. The alimentary efficiency (ALE) and rumination efficiency (RUE) in DM/h had decreasing linear effect with increase of WBG in the diet, but when ALE NDF/h obtained a quadratic effect where larger efficiency were observed in the diets with 50% of WBG, RUENDF had decreased linear effect with increase of levels of WBG. The water balance was also influenced by the increase of the levels of WBG in diet, where larger intakes and excretions were obtained by animals that intake diet without WBG in its composition. Increases of levels of WBG decreased intake and excretions of water. It can be concluded the at diet can be used up to 50% of replacing of concentrate in the diets of lactating goats. / Este trabalho foi realizado com o objetivo de avaliar o consumo, a digestibilidade aparente dos nutrientes, o balan?o de nitrog?nio, comportamento alimentar e balan?o h?drico em cabras lactantes, alimentadas com dietas contendo diferentes n?veis de substitui??o do concentrado por res?duo ?mido de cervejaria (RUC): 0, 25, 50, 75 e 100%. Foram utilizadas cinco cabras mesti?as Boer x Saanen e cinco cabras Saanen distribu?das em dois quadrados latinos 5x5. Os cinco per?odos experimentais tiveram dura??o de 15 dias, sendo 10 de adapta??o e cinco dias de coleta de dados e de amostras. O volumoso utilizado foi o feno de tifton, na rela??o volumoso: concentrado de 40:60. Os animais foram alojados em gaiolas metab?licas, alimentados duas vezes ao dia. Na avalia??o do comportamento alimentar foram medidos os tempos dispendidos com alimenta??o, tempo de rumina??o e tempo de ociosidade que foram avaliados por observa??es dos animais a cada 20 minutos at? completarem 24 horas. O consumo de mat?ria seca em kg e em porcentagem do peso vivo (% PV), mat?ria org?nica, prote?na bruta, extrato et?reo, carboidratos totais e nutrientes digest?veis totais em g/d e fibra em detergente neutro em gramas e %PV, apresentaram resposta quadr?tica, onde as dietas mais consumidas foram a sem inclus?o de RUC e com n?vel de substitui??o de 25%. Observou-se resposta linear decrescente para a digestibilidade aparente da MS, MO e CT de acordo com o aumento dos n?veis de RUC na dieta e resposta quadr?tica para digestibilidade da PB , onde maior digestibilidade ocorreu na dieta com n?vel de substitui??o de 25% de RUC. O balan?o de nitrog?nio obteve resposta linear decrescente com o aumento de RUC na dieta. O tempo gasto com alimenta??o (TA) e com ociosidade (TO), n?o diferiram (P>0,05) quanto aos n?veis de RUC na dieta, no entanto, resposta linear crescente foi observada para os tempos dispendidos com rumina??o e com a mastiga??o total, com o aumento dos n?veis de RUC na dieta. A efici?ncia alimentar (EAL) e a efici?ncia de rumina??o (ERU) expressas em MS/h obtiveram resposta linear decrescente com o aumento de RUC na dieta, mas quando expressas em FDN/h a EAL obteve resposta quadr?tica onde maiores efici?ncias foram observadas nas dietas com 50% de RUC, a efici?ncia de rumina??o expressa em FDN/h apresentou resposta linear, diminuindo ? medida que aumentavam os n?veis de RUC. O balan?o h?drico tamb?m foi influenciado pelo aumento dos n?veis de RUC na dieta, onde animais que consumiram as dietas com 0% de RUC apresentaram maiores consumos e excre??es. ? medida que aumentaram os n?veis de RUC, menor foi o consumo e excre??o de ?gua. Concluiu-se que o RUC pode ser utilizado em at? 50% de substitui??o do concentrado na dieta de cabras lactantes.

Made available in DSpace on 2014-06-11T19:32:57Z (GMT). No. of bitstreams: 0 Previous issue date: 2010-11-19Bitstream added on 2014-06-13T21:05:22Z : No. of bitstreams: 1 missio_rl_dr_jabo.pdf: 805386 bytes, checksum: fd72382d10b76ace86d683f99af93f1d (MD5) / Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Este estudo objetivou avaliar o armazenamento da cana-de-açúcar hidrolisada com 0,5% de cal hidratada sobre o consumo das frações alimentares, desempenho animal, viabilidade econômica, comportamento ingestivo, características nutritivas da forragem e aspectos da digestão de novilhas confinadas. Foram realizados dois experimentos. No primeiro (Capítulo 2 e 3), foram utilizadas 24 novilhas da raça Nelore distribuídas inteiramente ao acaso nos tratamentos formados por dietas com cana-de-açúcar in natura (tempo zero), cana-de-açúcar hidrolisada e armazenada por 24, 48 ou 72 horas. No segundo (Capítulo 4), foram utilizadas quatro novilhas da raça Nelore delineadas num quadrado latino 4x4, onde foram avaliadas as dietas anteriormente descritas. No primeiro experimento, verificou-se variação cúbica (P < 0,05) em função do tempo de armazenamento da cana-de-açúcar da maioria das variáveis relacionadas ao consumo das frações alimentares e desempenho animal, apresentando melhores resultados para novilhas alimentadas com cana-de-açúcar in natura. O armazenamento da cana-de-açúcar até 72 horas proporcionou aumento linear (P < 0,05) da fração de carboidratos potencialmente degradáveis e diminuição dos custos de produção. Novilhas alimentadas com dietas a base de cana-de-açúcar in natura apresentaram maior tempo de ruminação (P < 0,05). No segundo experimento, verificou-se que o consumo e digestibilidade dos nutrientes, o balanço de nitrogênio, a eficiência de síntese de proteína microbiana e o nitrogênio amoniacal não foram influenciados (P > 0,05) pelas dietas. O armazenamento da cana-de-açúcar com adição de 0,5% de cal hidratada até 72 horas deprime o consumo e desempenho de novilhas jovens da raça Nelore / This study evaluated the effect of storage of hydrolyzed sugarcane with .5% hydrated lime the dietary fractions intake, animal performance, economic viability, ingestive behavior, nutritional characteristics of forage and digestion aspects of confined heifers. Two experiments were conducted. In the first (Chapter 2 and 3), 24 Nellore heifers were used and randomly distributed in treatment formed by diets constituted by fresh sugarcane (zero time), hydrolyzed sugarcane and stored for 24, 48 or 72 hours. In the second (Chapter 4), four heifers were used constituting a 4x4 latin square, with similar diets previous. In the first experiment, there was variation cubic (P < .05) according the storage time of most variables related to dietary fractions intake and animal performance, with better results for heifers fed with fresh sugarcane. Storage of sugarcane until 72 hours promoted linear increased (P < .05) in the carbohydrate fraction potentially degradable and decreased production costs. Heifers fed diets with fresh sugarcane presented higher time ruminating (P < .05). In the second experiment, it was found that the intake and digestibility of nutrients, the nitrogen balance, the efficiency of microbial protein synthesis and the ammonia nitrogen were not affected (P > .05) by diets. The storage of hydrolyzed sugarcane with .5% of hydrated lime up to 72 hours depresses intake and performance of young Nellore heifers