Níveis energéticos e correção de nutrientes em dietas para frangos de corte

• Ano de defesa: 2019
• Autor(a) principal: Feitosa, Victor Emanuel Meneses
• Orientador(a): Brito, Claudson Oliveira
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Programa de Pós-Graduação: Pós-Graduação em Zootecnia
• Palavras-chave em Português: Zootecnia; Nutrição animal; Frango de corte; Alimentação e rações; Aminoácidos; Densidade energética; Lisina; Minerais
• Palavras-chave em Inglês: Amino acids; Energy density; Lysine; Minerals; Animal nutrition
• Área do conhecimento CNPq: CIENCIAS AGRARIAS::ZOOTECNIA
• Link de acesso: http://ri.ufs.br/jspui/handle/riufs/11903

The dietary supply of energy, lysine, calcium and phosphorus can favor the digestion, absorption and utilization of these nutrients, reflecting on the nutrition and skeletal health of broilers. The objective of this study was to evaluate the supply of metabolizable energy levels with or without the correction of available digestible lysine, calcium and phosphorus nutrients, on the nutrient digestibility, performance and carcass yield of male broilers in the period of 8 to 42 days of age. Three experiments were carried out, in experiment I (nutrient digestibility), using 210 COBB 500 broiler chicks, with a mean weight of 490 g, at the age of 14 to 21 days. The birds were distributed in a completely randomized design in factorial arrangement 3x2+1, with three levels of metabolizable energy (3,050, 3,125 and 3,200 kcal / kg) with or without the correction of nutrients digestible lysine, calcium and phosphorus available, in the proportions of 2,5%; 5% and 7.5% respectively at the energy level and a control treatment with 2,975 kcal / kg, totaling seven treatments with six replicates and five birds per experimental unit. In experiment II (performance), 1,120 broilers were used, with 8 to 21 days of age, with an average weight of 190 g. The birds were submitted to the same design and treatments used in experiment I, however, eight replicates were used with 20 birds per experimental unit. In Experiment III (performance), 1,008 broiler with a mean weight of 855 g. The birds were distributed in a similar design to experiment II, with metabolizable energy levels of 3,100, 3,175 and 3,250 kcal / kg with the same nutrient corrections and control treatment with 3,025 kcal / kg, totaling seven treatments, eight replicates and 18 birds per experimental unit. The dry matter and crude protein digestibility coefficients were significantly improved (P ≤ 0.05), the diet with the highest energy level (3,200 kcal / kg) and the respective nutrient correction 7.5% provided higher digestibility in relation to the other diets. It was observed that crude energy showed higher digestibility when nutrients were corrected (P≤0.05), but there was no significant response (P> 0.05) on nitrogen retention. These results reflected the performance of the birds in the period from 8 to 21 days of age, which presented higher weight gain and better feed conversion with the increase of the dietary energy level. From the 22 days of age until slaughter (42 days), there were no interactions (P> 0.05) between energy and nutrient correction on poultry performance, but the increase in energy level and correction improved feed conversion ratio. Thus, the greater energy change and correction of the main nutrients provided improvements in the use of nutrients and consequently in the performance.