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      Desempenho e avaliação econômica da terminação de tourinhos em confinamento alimentados com diferentes níveis de concentrado na dieta Translated title: Performance and economic evaluation of young finished feedlot bulls fed different concentrate levels in the diet


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          Este estudo foi conduzido para avaliar o desempenho animal e a viabilidade econômica da utilização de diferentes níveis de concentrado na dieta no confinamento de tourinhos para abate entre 14-16 meses de idade. Foram utilizados 16 bovinos não-castrados alimentados com 22, 40, 59 ou 79% de concentrado na dieta, distribuídos em delineamento inteiramente ao acaso, com quatro repetições por tratamento. A idade e o peso médio inicial dos animais foram de 9,32 meses e 192 kg, respectivamente. A idade de abate, o peso final, o consumo de fibra em detergente neutro, a conversão alimentar e a lucratividade mensal diminuíram com o aumento do nível de concentrado. O consumo de matéria seca em porcentagem do peso vivo e do tamanho metabólicoapresentaram comportamento quadrático, aumentando até os níveis de 67 e 75% de concentrado na dieta, respectivamente. O consumo de energia digestível e o ganho de peso vivo médio diário apresentaram aumentos lineares com a elevação do nível de concentrado. O aumento do nível de concentrado da dieta de 22 para 79% aumenta o desempenho animal, mas reduz a lucratividade da terminação de tourinhos dos 14 aos 16 meses de idade.

          Translated abstract

          This study was conducted to evaluate the performance and economic viability of young bulls slaughtered at 14-16 months old, fed on different concentrate levels in the diet. Sixteen young bulls were randomly distributed and fed with 22, 40, 59 or 79% concentrate in the diet, resulting in four replications per treatment. The initial age and weight were 9.32 months and 192.44 kg, respectively. Final age, final weight, neutral fiber detergent intake, feed conversion and monthly profit decreased with increasing concentrate levels. The dry matter intake as percentage of live weight and metabolic size showed quadratic variation, increasing to 67 and 75% concentrate in the diet, respectively. The digestible energy intake and average daily weight gain increased with increases in concentrate levels. The increase in the level of dietary concentrate from 22 to 79% increased the animal performance, but decreased the profitability of young finished feedlot bulls at 14-16 months old.

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          Most cited references26

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          Nutrient requirements of beef cattle

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            Nutritional Ecology of the Ruminant

            This monumental text-reference places in clear persepctive the importance of nutritional assessments to the ecology and biology of ruminants and other nonruminant herbivorous mammals. Now extensively revised and significantly expanded, it reflects the changes and growth in ruminant nutrition and related ecology since 1982. Among the subjects Peter J. Van Soest covers are nutritional constraints, mineral nutrition, rumen fermentation, microbial ecology, utilization of fibrous carbohydrates, application of ruminant precepts to fermentive digestion in nonruminants, as well as taxonomy, evolution, nonruminant competitors, gastrointestinal anatomies, feeding behavior, and problems fo animal size. He also discusses methods of evaluation, nutritive value, physical struture and chemical composition of feeds, forages, and broses, the effects of lignification, and ecology of plant self-protection, in addition to metabolism of energy, protein, lipids, control of feed intake, mathematical models of animal function, digestive flow, and net energy. Van Soest has introduced a number of changes in this edition, including new illustrations and tables. He places nutritional studies in historical context to show not only the effectiveness of nutritional approaches but also why nutrition is of fundamental importance to issues of world conservation. He has extended precepts of ruminant nutritional ecology to such distant adaptations as the giant panda and streamlined conceptual issues in a clearer logical progression, with emphasis on mechanistic causal interrelationships. Peter J. Van Soest is Professor of Animal Nutrition in the Department of Animal Science and the Division of Nutritional Sciences at the New York State College of Agriculture and Life Sciences, Cornell University.
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              A theoretically-based model for predicting total digestible nutrient values of forages and concentrates


                Author and article information

                Revista Brasileira de Zootecnia
                R. Bras. Zootec.
                Sociedade Brasileira de Zootecnia (Viçosa, MG, Brazil )
                July 2009
                : 38
                : 7
                : 1309-1316
                [03] orgnameCNPq
                [02] orgnameUFSM orgdiv1Departamento de Zootecnia
                [04] orgnameUFG
                [01] orgnameUFSM orgdiv1Programa de Pós-Graduação em Zootecnia
                S1516-35982009000700021 S1516-3598(09)03800721

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 26, Pages: 8

                SciELO Brazil

                Produção Animal

                corn silage,costs,genetic composition,intake,profitably,silagem de milho,lucratividade,custos,consumo,composição genética


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