Enzimas em dietas com redução nutricional para frangos de corte

Abstract

Two experiments were conducted in order to achieve the effect of enzymes in diet based on corn and soybean meal. The first experiment aimed to evaluate the performance, carcass yield and ileal digestibility in broilers fed enzymes 21-42 days old. They were used in 1008 broiler chickens, Cobb-500, males, distributed in a completely randomized design involving six treatments and eight repetitions defined as follows: 1) Food positive control (CP) based on corn and soybean meal; 2) negative control diet (CN) based on corn and soybean meal with a reduction of 120 kcal / kg metabolizable energy (ME); 3) EC1 (CN + adding 100 ppm of Econase); 4) CE2 (CN + addition of 200 ppm of Avizyme); 5) BE1 (CN + addition of 100 ppm and 200 ppm xylanase Amylase); 6) BE2 (CN + with addition of 100 ppm 300 ppm xylanase and amylase). The data on performance, income cuts, coefficient and nutrient digestibility were analyzed using the boxplot test (SAS, 2002), and after the removal of outliers was performed ANOVA and subsequent average test (Tukey) to the level of 5% probability. As a result, there was no significant effect on feed intake. However, the results observed with CE2 and BE2 enzymes in weight gain variables, final weight, feed conversion, digestibility of dry matter, crude protein, crude energy and nutrient digestibility of dry matter, crude protein and energy Gross obtained results similar to CP. Concluding that the DM digestibility coefficients, PB and ED, digestibility of DM, CP, EB, GP data, PF, CA and carcass yield, the enzyme complex 2 (CE2) and blend enzyme 2 (BE2 ), when added to the diet to reduce energy provided similar results to the positive control. The second experiment was to evaluate the performance, carcass yield, cuts and blood test in broilers fed enzyme complexes 01-42 days old. They were used 960 broiler, Cobb-500, males, distributed in a completely randomized design involving six treatments and eight repetitions defined as follows: 1) Food positive control (CP) based on corn and soybean meal; 2) feed negative control (CN) based on corn and soybean meal with a reduction of 5% in the amino acid values, protein and metabolizable energy (ME); 3) BE1 (CN + addition of 125 ppm Poultrygrow); 4) BE2 (CN + addition of 100 ppm of axtra); 5) BE3 (CN + addition 500 ppm Ronozyme); 6) BE4 (CN + addition of 125 ppm and 500 ppm Poultrygrow Hemicell). We evaluated performance (feed intake, weight gain and feed conversion), yield (carcass and cuts), and blood tests (cholesterol, triglycerides, total protein, uric acid, creatinine, alanine aminotransferase, aspartate aminotransferase, albumin, glucose, urea). Performance data, carcass yield, cuts, organs, abdominal fat and blood parameters were submitted to boxplot test for removal of outliers, and subsequently was conducted analysis of variance and mean comparison test (Tukey) at 5% probability. The feed intake showed no significant difference between treatments. 7 of weight gain; 14; 21:35 days old CN and observed by the enzymes in improved weight gain, however, CP showed the best result. For the period 1-42 days just the CP met the aexigências of birds. Feed conversion in the pre-initial phase (1-7 days old) was positive (p <0.05) in CP. In the periods 1 to 14; 1 to 21 and 1 to 35 days of age, the enzyme supplementation gave similar results to the CN and CP value greater (p <0.05). Between 1-42 days of age, the CP had the best feed conversion, and the enzymes were similar to CN. The chickens fed diet enzyme provided superior result to the CP and similar to CN. The yield breast and wing showed no significant differences between treatments. The yield leg (thigh and drumstick) showed similar results between the enzyme and the CP. The yield livers and gizzards showed no significant difference and the relative pancreas weight showed enzyme gave rise compared with the diets of CN and CP. The abdominal fat yield observed in the CN and enzymatic treatments provided by increasing the amount of abdominal fat compared to CP. The result of biochemical blood cholesterol profile indicated that the enzyme supplementation can influence the increase in cholesterol levels, being observed greater value in CE3. The triglyceride level observed in enzymatic treatments was similar to CP, indicating the action of enzymes in the diet. Albumin variable demonstrated that the addition of the enzyme complex was not sufficient. ALT levels demonstrated that the enzymatic complex and yielded low activity CN, the CP and the highest level. The levels of glucose, total protein and aspartate amino transferase (AST), creatinine and uric acid were similar for all treatments and presented according to the values recommended for lineage. Concluding that nutritional reductions in poultry diets affect performance, carcass characteristics and biochemical profile and that supplementation of enzymatic complexes was not efficient in the release of nutrients when using matrix with severe reductions