Made available in DSpace on 2015-04-09T12:28:19Z (GMT). No. of bitstreams: 0 Previous issue date: 2013-02-08Bitstream added on 2015-04-09T12:47:41Z : No. of bitstreams: 1 000814534.pdf: 1033654 bytes, checksum: 6e36782a784b174f00b2f53aa141d451 (MD5) / Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Capes) / The poultry industry has sought to optimize animal production. For this reason, the mathematical modeling is an essential tool to achieve greater control and production planning, appropriate to the different feeding conditions, market and economic interests. This study aimed to obtain mathematical models capable of predicting the responses of broiler performance due to changes in levels of energy density, according to the phase and sex, as base to a system of nonlinear feed formulation. Therefore, two experiments were conducted simultaneously, for 240 broiler females and 240 males. The birds were distributed in a completely randomized design with six energy levels (2,800; 2,900; 3,000; 3,100; 3,200 and 3,300 kcal ME/kg, maintaining the relationship between energy and other nutrients) and four replicates of ten birds, allocated to floor pens. Data on body weight, feed intake, energy consumption, feed conversion, carcass weight and abdominal fat were analyzed by response surface methodology. Feed intake and body weight were used to determine rates of gain that maximize economic return, according to the energy density, the market prices of ingredients and kilogram of broilers. It was concluded that the concept of nonlinear formulation seems more appropriate to meet the concept of precision nutrition for broilers, since the requirements of all nutrients are automatically adjusted by the mathematical model related to energy content estimated, according to the nutritional recommendations for different ages and stages of broilers, according to the program PPFR / FAPESP: 2009/09500-0

Resumo:A avicultura de corte tem buscado a otimização da produção animal. Por esta razão, a modelagem matemática representa uma ferramenta imprescindível para se obter um maior controle e planejamento produtivo, adequado às diferentes condições de alimentação, do mercado e interesses econômicos. Assim, este trabalho teve a finalidade de obter modelos matemáticos, capazes de estimar as repostas do desempenho de frangos de corte em razão das mudanças da densidade energética da dieta, segundo a fase de criação e o sexo, como base de um sistema de formulação de rações não linear. Para tanto, foram conduzidos simultaneamente dois experimentos, para 240 frangos de corte fêmeas e 240 machos. As aves foram distribuídas em delineamento inteiramente casualizado com seis níveis de energia metabolizável (2.800; 2.900; 3.000; 3.100; 3.200 e 3.300 kcal/kg, mantendo-se a relação entre os demais nutrientes) e quatro repetições de dez aves, sendo alojadas em piso. Os dados de peso corporal, consumo de ração, consumo de energia, conversão alimentar, peso da carcaça e da gordura cavitária foram analisados segundo a metodologia de superfície de resposta. O consumo de ração e o peso corporal foram utilizados para se determinar as taxas de ganho que maximizam o retorno econômico, de acordo com a densidade energética, os preços de mercado dos ingredientes e do kg do frango. Concluiu-se que o princípio de formulação não linear mostra-se mais apropriado para atender ao conceito da nutrição de precisão para frangos de corte, uma vez que, as exigências de todos os nutrientes são automaticamente ajustadas pelo modelo matemático, relacionados ao teor energético estimado, conforme as recomendações nutricionais distintas para fases e idades de frangos de corte, segundo o programa PPFR / Abstract:The poultry industry has sought to optimize animal production. For this reason, the mathematical modeling is an essential tool to achieve greater control and production planning, appropriate to the different feeding conditions, market and economic interests. This study aimed to obtain mathematical models capable of predicting the responses of broiler performance due to changes in levels of energy density, according to the phase and sex, as base to a system of nonlinear feed formulation. Therefore, two experiments were conducted simultaneously, for 240 broiler females and 240 males. The birds were distributed in a completely randomized design with six energy levels (2,800; 2,900; 3,000; 3,100; 3,200 and 3,300 kcal ME/kg, maintaining the relationship between energy and other nutrients) and four replicates of ten birds, allocated to floor pens. Data on body weight, feed intake, energy consumption, feed conversion, carcass weight and abdominal fat were analyzed by response surface methodology. Feed intake and body weight were used to determine rates of gain that maximize economic return, according to the energy density, the market prices of ingredients and kilogram of broilers. It was concluded that the concept of nonlinear formulation seems more appropriate to meet the concept of precision nutrition for broilers, since the requirements of all nutrients are automatically adjusted by the mathematical model related to energy content estimated, according to the nutritional recommendations for different ages and stages of broilers, according to the program PPFR / Orientador: Manoel Garcia Neto / Banca: Marcos Franke Pinto / Banca: Douglas Emygdio de Faria / Mestre