Níveis de energia metabolizável para aves de corte de crescimento lento criadas em sistema semiconfinado
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Data
2005-03-02
Autores
Mendonça, Michele de Oliveira [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
Foram conduzidos seis ensaios para determinar os níveis de energia metabolizável (EM) e a melhor relação energia:proteína (E:P) para aves de corte de crescimento lento, machos e fêmeas, criadas em sistema semiconfinado nas fases: inicial (um a 21), crescimento (22 a 49) e final (50 a 70 e 50 a 85 dias de idade para machos e fêmeas, respectivamente). A fase final para as fêmeas estendeu-se até 85 dias devido não terem atingido o peso de 2,3kg. Cada piquete da instalação experimental dispõe de uma área coberta de 3, 13m2 e uma área de pastejo de 72,87m2. O delineamento experimental foi o inteiramente casualizado com cinco tratamentos e quatro repetições de 20 aves cada. A proteína bruta e os demais nutrientes foram mantidos constantes em todas as rações de acordo com as recomendações do NRC (1994) para cada fase. Os dados foram analisados utilizando aSAS (1999). A relação E:P e o nível de EM que maximizaram o desempenho e as características da carcaça de frangos machos e fêmeas de crescimento lento em cada fase estudada foram: 128 e 2750 (inicial); 147 e 2850 (crescimento); 172 e 3100 kcal de EM/kg na ração (final). Paralelamente aos ensaios de desempenho, foram conduzidos três ensaios de metabolismo para determinar o aproveitamento da energia das rações utilizadas nas respectivas fases. As aves demonstraram aumentar a capacidade de metabolização da energia da dieta com a idade.
Six trials were conducted to determine the metabolizable energy (ME) and the energy to protein ratio (E:P) for broilers of slow growth, males and females, raised in semi confined system in the starter (one to 21), grower (22 to 49) and finisher phase (50 to 70 and 50 to 85 days of age, males and females, respectively). The final phase of the females extended to 85 days in order to reach 2.3kg. Each picket of the experimental unit were constituted a covering area of 3.13m2 and a pasture area of 72.87m2. The experimental design was the completely randomized with five levels of ME, four replications of 20 birds per experimental unit. The crude protein and other nutrients were maintained at the same levei in ali diets according to the NRC (1994) recommendations. The data were analysed by SAS (1999). According to the results obtained, the E:P ratio and the ME levei that provide the best performance and carcass characterists of broilers of slow growth, males and females, in each phase were: 128 and 2750 (starter); 147 and 2850 (grower); 172 and 3100 kcal of ME/kg of diet (finisher). At the same time to the performance trials were conducted three metabolism trials to determine the utilization of the energy of the diets used in the respective phases. The birds demonstrated increase the capacity of using the energy of the diet with the age.
Six trials were conducted to determine the metabolizable energy (ME) and the energy to protein ratio (E:P) for broilers of slow growth, males and females, raised in semi confined system in the starter (one to 21), grower (22 to 49) and finisher phase (50 to 70 and 50 to 85 days of age, males and females, respectively). The final phase of the females extended to 85 days in order to reach 2.3kg. Each picket of the experimental unit were constituted a covering area of 3.13m2 and a pasture area of 72.87m2. The experimental design was the completely randomized with five levels of ME, four replications of 20 birds per experimental unit. The crude protein and other nutrients were maintained at the same levei in ali diets according to the NRC (1994) recommendations. The data were analysed by SAS (1999). According to the results obtained, the E:P ratio and the ME levei that provide the best performance and carcass characterists of broilers of slow growth, males and females, in each phase were: 128 and 2750 (starter); 147 and 2850 (grower); 172 and 3100 kcal of ME/kg of diet (finisher). At the same time to the performance trials were conducted three metabolism trials to determine the utilization of the energy of the diets used in the respective phases. The birds demonstrated increase the capacity of using the energy of the diet with the age.
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Confinamento (Animais), Ave domestica - Criação
Como citar
MENDONÇA, Michele de Oliveira. Níveis de energia metabolizável para aves de corte de crescimento lento criadas em sistema semiconfinado. 2005. xvi, 114 f. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, 2005.