Avaliação nutricional de enzimas exógenas em dietas para frangos de corte

• Autor(a) principal: Messias, Rodrigo Knop Guazzi
• Data de Publicação: 2014
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/1890
• topic: Frangos de corte - Alimentação e rações; Frangos de corte - Nutrição; Nutrição animal; Digestão; Enzimas; Broilers - Food and feed; Broilers - Nutrition; Animal nutrition; Digestion; Enzymes; CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA::NUTRICAO E ALIMENTACAO ANIMAL

Three experiments were conducted to evaluate the effects of enzymes on the amino acid digestibility and performance of broiler chickens. The first experiment was a performance trial using 2000 animals from 14 to 28 days of age divided in three groups whose diets had reductions according to the recommendations of the enzyme (Phytase, Protease, Phytase +Protease ), each group had three treatments Negative Control (CN), Cotrole Negative + Enzyme (CNE) Positive Control (CP), was also added using a treatment levels of the Brazilian Tables 2011 (Rostagno et. al 2011), totaling 10 treatments with 10 replications and 20 animals per experimental unit distributed on randomized blocks and evaluated by orthogonal contrasts. The treatments with phytase had higher (P <0.05) weight gain and feed conversion compared to those not receiving enzyme. There was no difference (P> 0.05) for weight gain in treatments with protease. The association of enzymes promoted improvement in all parameters compared performance when compared to the negative control. In the second experiment was performed with 3 trials to evaluate the loss of endogenous amino acids, the true digestibility of amino acids in soybean meal and also in a complete diet. Each trial used 168 animals divided into four treatments: control (no enzyme addition) Addition of protease, carbohydrase addition, association between the two enzymes. Each treatment had 6 replicates and 7 birds per pen, distributed in a completely randomized design. Enzymes influenced the birds' endogenous amino acid loss, besides increasing the ileal digestibility of amino acids in soybean meal and the basal diet. There was also more pronounced effect compared to protease carbohydrase addition, the combination of the protease enzymes used yielded similar isolation effect. No additive effect of the enzymes was observed. The third experiment was conducted to determine the ileal amino acid digestibility of diets with different levels of crude protein supplemented with enzymes 504 broiler chicks were used during the experimental period of 14 to 24 days old. The animals were distributed in metabolic cages in 4 x 2 factorial (enzymes and protein levels) resulting in 8 treatments with 6 replicates of 7 birds per experimental unit. The enzymes used were: a protease, carbohydrase and one a combination of both, to determine the true digestibility values of excretion of the experiment 2. Protein levels used were 21.0% and 14.7% were used. The supplementation of diets with isolated enzymes or in combination resulted in an increase (P <0.05) in digestibility of most amino acids. A diet with lower crude protein showed higher true digestibility of amino acids. There was a significant interaction (P <0.05) for some amino acids.