ABSTRACT
ABSTRACT An experiment was conducted with the purpose of evaluating enzyme blends on the performance, carcass traits, and bone mineralization of broilers. In total, 928 one-day-old Cobb 500 male chicks of were used. A completely randomized design with four treatments with eight replicates of 29 birds each was adopted. The evaluated treatments were: 1- Positive Control (PC), feed containing the nutritional recommendations of the genetic company's manual; 2- Negative Control (NC), feed with reductions of 75 kcal/kg AME and 0.10 and 0.12 percent points of phosphorus and calcium, respectively; 3 - NC + enzyme blend (amylase + b-glucanase, xylanase, and phytase; 250 g/t of feed) and 4 - NC + enzyme complex (phytase, amylase, xylanase, glucanase, pectinase, cellulase, and protease; 200 g/t of feed). Birds fed the diet with reduced nutrient levels (NC) presented the worst performance (p 0.05). The supplementation of the enzyme blend promoted similar (p 0.05) weight gain and feed conversion ratio as those obtained with the PC diet during the period of 1-21 days of age. During the phase of 22-42 days and the entire experimental period, weight gain and feed conversion ratio improved with the use of the enzyme combinations compared with the NC group, but remained lower than the PC group. Enzymes combinations did not affect (p>0.05) carcass or parts yields. The broilers fed the reduced-nutrient and energy diet presented lower (p 0.05) tibial ash, calcium, and phosphorus contents that the other treatments. The use of enzyme combinations improved the performance of broilers fed diets with reduced nutrient and energy levels.
ABSTRACT
ABSTRACT An experiment was conducted with the purpose of evaluating enzyme blends on the performance, carcass traits, and bone mineralization of broilers. In total, 928 one-day-old Cobb 500 male chicks of were used. A completely randomized design with four treatments with eight replicates of 29 birds each was adopted. The evaluated treatments were: 1- Positive Control (PC), feed containing the nutritional recommendations of the genetic company's manual; 2- Negative Control (NC), feed with reductions of 75 kcal/kg AME and 0.10 and 0.12 percent points of phosphorus and calcium, respectively; 3 - NC + enzyme blend (amylase + b-glucanase, xylanase, and phytase; 250 g/t of feed) and 4 - NC + enzyme complex (phytase, amylase, xylanase, glucanase, pectinase, cellulase, and protease; 200 g/t of feed). Birds fed the diet with reduced nutrient levels (NC) presented the worst performance (p 0.05). The supplementation of the enzyme blend promoted similar (p 0.05) weight gain and feed conversion ratio as those obtained with the PC diet during the period of 1-21 days of age. During the phase of 22-42 days and the entire experimental period, weight gain and feed conversion ratio improved with the use of the enzyme combinations compared with the NC group, but remained lower than the PC group. Enzymes combinations did not affect (p>0.05) carcass or parts yields. The broilers fed the reduced-nutrient and energy diet presented lower (p 0.05) tibial ash, calcium, and phosphorus contents that the other treatments. The use of enzyme combinations improved the performance of broilers fed diets with reduced nutrient and energy levels.
ABSTRACT
ABSTRACT The objective of this study was to determine the occurrence of aflatoxins in the corn used as poultry feed in the state of Bahia, Brazil. Eighty samples of corn were collected from two poultry feed factories between February 2005 and January 2006. The aflatoxins analyses were performed using a fluorometric technique with commercial immunoaffinity columns (Aflatest®, Vicam). The results revealed contamination in 8 (10%) of the samples, with levels varying from 1 to 5 ?g/kg. These results reflect the good quality of this product in regard to contamination by aflatoxins.
RESUMO O objetivo deste estudo foi determinar a ocorrência de aflatoxinas (AFs) em milho destinado à alimentação de aves no Estado da Bahia. Oitenta amostras de milho foram coletadas de duas fábricas produtoras de ração durante o período de fevereiro de 2005 a janeiro de 2006. As análises de AFs foram realizadas por meio da técnica de fluorimetria com colunas de imunoafinidade (Aflatest®, Vicam). Os resultados revelaram que oito (10%) amostras estavam contaminadas, com níveis variáveis de 1 a 5 ?g/kg. Estes resultados demonstram a boa qualidade do produto quanto à contaminação por aflatoxinas.