Adição de misturas enzimáticas em rações com restrição nutricional para frangos de corte

• Autor(a) principal: Silva, João Pedro Sabino de Souza
• Data de Publicação: 2016
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UFPB
• Texto Completo: https://repositorio.ufpb.br/jspui/handle/123456789/16009
• topic: Desempenho; Enzimas; Resistência óssea; Utilização de nutrientes; CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA

Two experiments were performed to evaluate the addition of enzymes in diets with nutritional restriction for broilers, 8-21 and 33-47 days of age. From 8 to 21 days were used 900 chicks and 33 to 47 days 300 chickens, both groups, males of Cobb-500 SF, were distributed in a completely randomized design. In 8-21 days, the treatments consisted of: 1. Positive Control (PC); 2. Negative Control (NC) with reductions of 2.5% of CP, Met + Cys, Lys, Thr, AMEn, Ca and Pd; 3. NC + Enzymes Blend 1 (EB1): 200 g/ton of protease (15.000 PROT/kg) + 133 g/ton amylase (80 KNU/kg) + 100 g/ton of phytase (1,000 FYT/kg); 4. NC + EB2: 200g/ton protease (15.000 PROT/kg) + 133 g/ton 80 (amylase KNU/kg) + 250 g/ton of phytase (2500 FYT / kg); 5. NC + EB3: similar to EB1 + 50g/ton of xylanase (100 FXU/kg); and, 6. NC + EB4: similar to BE2 + 50g/ton (100 FXU xylanase/kg), each treatment had ten replicates of 15 birds. In phase 33-47 days, the treatments were: 1. PC; 2. NC1 (reduction of 1.5% in CP, Met + Cys, Lys, Thr, Pd and AMEn); 3. NC2 (3.0% reduction in CP, Met + Cys, Lys, Thr, Pd and AMEn); 4. NC1 + EB4; and 5. NC2 + BE4, each treatment had four replicates of 15 birds. From 8 to 21 days the performance of the birds receiving NC diet supplemented with BE1, BE2, BE3 and BE4 were similar to that birds of PC diet while birds fed the NC diet had the worst performance and economic results. From 33 to 47 days of age, the body weight gain and feed conversion in chicken group fed NC2 + BE4 was better than those group of birds fed NC2 treatment, but there is no difference to chicks fed PC diet. The chickens group fed the NC2 diet + BE4 showed better yields thigh and wing compared to broilers fed the other diets, and the lowest percentage of abdominal fat compared to chickens fed PC, NC2 and NC1 + BE4, and better economic results compared to all other diets. The Seedor Index and bone strength were better for the tibias of groups of birds fed the NC2 + BE4 and PC diets. The addition of BE4 (200g/ton protease or 15.000 PROT/kg + 133 g/ton of amylase or 80 KNU/kg + 250 g/ton of phytase or 2500 FYT/kg + 50 g/ton of phytase and 100 FXU/kg) in diets with reduced of 2.5% of protein, essential amino acids, metabolizable energy, calcium and available phosphorus of 8 to 21 day of age, and 3.0% of 33 to 47 days of age, does not depress the performance, improves bone quality and economic feasibility of chickens compared the birds fed recommended nutritional levels.