Protease monocomponente de Bacillus liqueniformis nas dietas de frangos de corte

• Autor(a) principal: Gomides, Larissa Paula Silva
• Data de Publicação: 2018
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tede/8345
• topic: Digestibilidade; Desempenho; Enzima exógena; Nutrição; Digestibility; Exogenous enzyme; Nutrition; Performance; ZOOTECNIA::PRODUCAO ANIMAL

Two experiments were carried out to evaluate the effect of the addition of 0.02% protease enzyme (Ronozyme ProAct) on diets based on corn and soybean meal for broilers. In both experiments, the same treatments used: T1- control ration, T2- a value of the nutritional matrix proposed by the enzyme but without the additive, T3- twice the value proposed in T2 without enzyme, T4- T2 with enzyme, T5- T3 with enzyme. In the first experiment, to determine the performance and yield of carcass and cuts were housed 1200 broiler chicks of 1 day of age, distributed in a completely randomized design, totaling 5 treatments, with 8 replicates and 30 birds per box. In the second experiment for the determination of metabolizable coefficients and intestinal histomorphometry, the method of total collection of excreta and intestinal tract collection was used in 300 chicks housed in galvanized steel cages at 1 day of age, distributed in a completely randomized design , submitted to 5 treatments and 6 replicates of 10 birds each. In both experiments, data analysis was perform using analysis of variance (ANOVA). In the first experiment, when the data were statistically different at 10% probability, they were compared by the Scott Knott Test and in the second experiment, when the data were statistically different at 5%, they were compared by the Scott Knott Test. In the second experiment we also performed a multivariate analysis of the main components and estimated the Pearson correlations. Chickens fed the one valued with enzyme treatment obtained the same final weight and weight gain as the control until 35 days of age.The birds that received the control treatment presented higher carcass yield, and in the weight of the cuts, there were no statistical differences between the protease treatments. Diets with protease showed higher dry matter metabolizable coefficient and nitrogen metabolizable coefficient, demonstrating that enzyme supplementation was effective. There was higher villus height and villus ratio: ileus crypt in broilers fed diets supplemented with protease at 7 days of age, however, at 21 days protease inclusion was not superior to the control treatment. A strong positive and significant correlation was observe between metabolizable and intestinal histomorphometry variables. Therefore, recommended to use protease in broiler diets.