Navegando por Autor "Valadares, Leonora Ribeiro"
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Item Aditivos alternativos ao uso de antimicrobianos na alimentação de frangos de corte(Revista Brasileira de Agropecuária Sustentável, 2015-07-30) Dalólio, Felipe Santos; Moreira, Joerley; Valadares, Leonora Ribeiro; Nunes, Poliana Barbosa; Vaz, Diego Pereira; Pereira, Henrique José; Pires, Aldrin Vieira; Priscila Junia da CruzObjetivou-se com este trabalho avaliar o efeito de diferentes aditivos alternativos ao uso de antimicrobianos promotores de crescimento sobre o desempenho, o rendimento de carcaça e cortes e a qualidade da carne de frangos de corte no período de 1 a 42 dias de idade. Foram utilizadas 480 pintainhas de corte da linhagem Cobb 500, distribuídas em delineamento inteiramente casualizado, com seis tratamentos e quatro repetições de 20 aves cada. Foi avaliado na fase total de criação, 1 a 42 dias, o ganho de peso (GP), a conversão alimentar (CA), o consumo de ração (CR), a viabilidade criatória (VC) e o índice de eficiência produtivo (IEP). O rendimento de carcaça e a qualidade da carne foram avaliados aos 42 dias de idade. Avaliou-se as características de perda de peso por cocção (PPC), a maciez objetiva (MO), a capacidade de retenção de água (CRA) e o pH. Os parâmetros de desempenho, de rendimento de carcaça e cortes e de qualidade da carne não foram afetados pela suplementação dos diferentes tipos de aditivos alternativos aos antimicrobianos promotores de crescimento (P>0,05). Conclui- se que, os aditivos promotores de crescimento podem ser utilizados na alimentação de frangos de corte, em substituição ao antibiótico, sem comprometer o desempenho e as características de carcaça, no período de 1 a 42 dias de idade.Item Effect of roof painting of aviaries on thermal comfort, productive performance and physiological variables of broilers chickens(Revista Brasileira de Saúde e Produção Animal, 2018-07) Dalólio, Felipe Santos; Valadares, Leonora Ribeiro; Moreira, Joerley; Guimarães, Maria Clara de Carvalho; Tinôco, Ilda de Fátima Ferreira; Vaz, Diego Pereira; Lima, Héder José D’Avilla; Albino, Luiz Fernando TeixeiraThe objective this study was to evaluate the thermal comfort, performance and the physiological variables of 21-42 day of age broiler chickens housed in aviaries with painted and not painted fiber cement roof. A completely randomized design was used in a split-plot design where the plots were composed of the sheds (painted and not painted roof) and the subplots were the evaluation hours (6h00, 9h00, 12h00, 15h00 and 18h00) for a 22-day data collection, considered as the replicates. It was observed that the external painting in white of the roof provided improvements inside the shed for airtemperature (Ta), roof temperature (Tr) and the thermal load of radiation (TLR). The relative humidity (RH) and the Globe-Temperature-Humidity-Index (GTHI) varied only according to the collection times. The exterior painting of the roof had no effect on the physiological variables of the broilers. Productivity performance indexes and financial compensation per lot were better for the roof painted shed. As a result, fiber cement roof painted in white is recommended in aviaries located in hot climates, such as the region in this study.Item Exogenous enzymes in diets for broilers(Revista Brasileira de Saúde e Produção Animal, 2016-04) Dalólio, Felipe Santos; Moreira, Joerley; Vaz, Diego Pereira; Albino, Luiz Fernando Teixeira; Valadares, Leonora Ribeiro; Pires, Aldrin Vieira; Pinheiro, Sandra Regina FreitasThe aimed of the study was to evaluate the effect of the inclusion of different levels of an enzyme complex consisting of phytase, protease, xylanase, β-glucanase, cellulase, amylase, and pectinase on the parameters of performance, carcass yield and meat quality of broilers. Six hundred broiler chicks were used, and the animals were females with one day of age, from the Cobb 500 strain, and distributed in a completely randomized design, with five levels of inclusion of the enzyme complex (0, 100, 200, 300 and 400g/ton), and six repetitions, with twenty animals each. The weight gain, feed conversion ratio, feed intake and production viability were assessed in stages between 1 to 21, 1 to 35 and 1 to 42 days of age. The carcass yield and meat quality were evaluated at 35 and 42 days of age. We evaluated the characteristics of weight loss by cooking, shear force, water holding capacity, pH, lightness and color. The parameters of performance, carcass yield and carcass parts, and meat quality were not affected by the enzyme supplementation of diets fed to broiler chickens (P>0.05), except for the performance characteristics of the breast and the wings at 42 days of age (P<0.05).