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dc.contributor.authorSakomura, N. K.-
dc.contributor.authorLongo, F. A.-
dc.contributor.authorOviedo-Rondon, E. O.-
dc.contributor.authorBoa-Viagem, C.-
dc.contributor.authorFerraudo, A.-
dc.identifier.citationPoultry Science, v. 84, n. 9, p. 1363-1369, 2005.-
dc.description.abstractTwo experiments were conducted to develop and evaluate a model to estimate ME requirements and determine Gompertz growth parameters for broilers. The first experiment was conducted to determine maintenance energy requirements and the efficiencies of energy utilization for fat and protein deposition. Maintenance ME (ME m) requirements were estimated to be 157.8, 112.1, and 127.2 kcal of ME/kg 0.75 per day for broilers at 13, 23, and 32°C, respectively. Environmental temperature (T) had a quadratic effect on maintenance requirements (ME m = 307.87 - 15.63T + 0.3105T 2; r 2= 0.93). Energy requirements for fat and protein deposition were estimated to be 13.52 and 12.59 kcal of ME/g, respectively. Based on these coefficients, a model was developed to calculate daily ME requirements: ME = BW 0.75 (307.87 - 15.63T + 0.3105 T 2) + 13.52 G f + 12.59 G p. This model considers live BW, the effects of environmental temperature, and fractional fat (G f) and protein (G p) deposition. The second experiment was carried out to estimate the growth parameters of Ross broilers and to collect data to evaluate the ME requirement model proposed. Live BW, empty feather-free carcass, weight of the feathers, and carcass chemical compositions were analyzed until 16 wk of age. Parameters of Gompertz curves for each component were estimated. Males had higher growth potential and higher capacity to deposit nutrients than females, except for fat deposition. Data of BW and body composition collected in this experiment were fitted into the energy model proposed herein and the equations described by Emmans (1989) and Chwalibog (1991). The daily ME requirements estimated by the model determined in this study were closer to the ME intake observed in this trial compared with other models. ©2005 Poultry Science Association, Inc.en
dc.subjectFactorial method-
dc.subjectGrowth parameter-
dc.subjectMetabolizable energy requirement-
dc.subjectModeling energy utilization-
dc.subjectbiological model-
dc.subjectcaloric intake-
dc.subjectenergy metabolism-
dc.subjectgrowth, development and aging-
dc.subjectnutritional requirement-
dc.subjectstatistical model-
dc.subjectweight gain-
dc.subjectEnergy Intake-
dc.subjectEnergy Metabolism-
dc.subjectLinear Models-
dc.subjectModels, Biological-
dc.subjectNutritional Requirements-
dc.subjectWeight Gain-
dc.subjectGallus gallus-
dc.titleModeling energy utilization and growth parameter description for broiler chickensen
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.contributor.institutionNorth Carolina State University-
dc.description.affiliationFaculdade de Ciências Agrárias e Veterinárias Universidade Estadual Paulista, Jaboticabal, São Paulo-
dc.description.affiliationDepartment of Poultry Science North Carolina State University, Raleigh, NC 27695-
dc.description.affiliationUnespFaculdade de Ciências Agrárias e Veterinárias Universidade Estadual Paulista, Jaboticabal, São Paulo-
dc.rights.accessRightsAcesso restrito-
dc.relation.ispartofPoultry Science-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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