Avaliação de um complexo enzimático em rações para frangos de corte com diferentes idades

• Autor(a) principal: Carvalho, Bruno Reis de
• Data de Publicação: 2013
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/5798
• topic: Enzima; Desempenho; Fosforo; Energia; Enzyme; Performance; Phosphorus; Energy; CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA::NUTRICAO E ALIMENTACAO ANIMAL::EXIGENCIAS NUTRICIONAIS DOS ANIMAIS

To evaluate an enzyme complex in diets with different nutrient levels, three performance experiments and two bioassays were conducted in the Poultry Sector of the Federal University of Viçosa. In performance experiments were used 2000 (1-21 days), 1600 (21-35 days) and 1200 (35-49 days) male broiler chicks, Cobb, distributed in a completely randomized design with 8 treatments in 2 x 4 factorial arrangement (with or without addition of the enzyme complex in four different nutrient levels), with ten replications with 25, 20 and 15 birds in each phase, respectively. The experimental diets were formulated to be different in energy levels, available phosphorus and digestible lysine, and the nutritional level 1 was formulated to meet the nutritional requirements of poultries (Rostagno et al., 2011) from which reductions were made: 56kcal/kg, 0,075% of P disp and 0.019% in Lys Dig (NN2); 75kcal/kg, 0.1% to P disp and 0.025% in Lys Dig (NN3) or 94kcal/kg, 0.125% P disp and 0,031% in Lys Dig (NN4), with or without addition of the enzyme complex. The supplementation of the enzyme complex (200 grams/ton) in diets formulated in the recommendations of Rostagno et al. (2011) showed statistically higher (P< 0.05) to diets without the complex, and NN2 in the initial phase and NN3 in the others phases with the addition of the complex showed similar results (P< 0.05) to the levels suggested by Rostagno et al. (2011). For the evaluation of metabolizable energy and nitrogen balance of diets, there were two metabolism trials, the first with 336 broiler chicks 13-21 days old in 6 replicates and 7 animals per experimental unit, and the second with 384 male broiler chicks of 25-33 days old with 8 reps and 6 animals per experimental unit were distributed in a completely randomized design with treatments equal to their performance phases. The results indicate that, under the requirements of diets, the use of the enzyme complex allowed the release of 36, 31 and 87 kcal AMEn in the first stage and 115, 110 and 13 kcal in the second stage, respectively. Thus, we can conclude that the potential for appreciation of the enzyme complex in diets for broilers is dependent on the stage of development of the animal and can promote improvements in the parameters of weight gain and feed conversion, and increased metabolizable energy of the feeds.