Performance and carcass characteristics of broilers fed corn soybean meal based diets supplemented with enzymatic complexes

Um experimento foi conduzido para avaliar o efeito da suplementa??o de complexos enzim?ticos ? dieta sobre o desempenho e as caracter?sticas de carca?a de frangos de corte de ambos os sexos. Avaliaram-se cinco dietas: controle positivo - ? base de milho e farelo de soja com farinha de carne e ossos, sem enzima; controle negativo - formulada com 3% menos de energia metaboliz?vel; controle negativo + 0,05% do complexo A (xilanase, 600 U/g; amilase, 8.000 U/g; e protease, 800 U/g); controle negativo + 0,04% do complexo B (?-amilase, 200 kNU/g; e ?-glucanase, 350 FBG/g); e controle negativo + 0,04% do complexo B + 0,01% da enzima C (xilanase, 1.000 FXU/g). N?o foram observadas diferen?as no desempenho das aves no per?odo de 1 a 7 dias de idade. Na fase de 1 a 21 dias de idade, os machos consumiram mais ra??o e as dietas com o complexo B resultaram em maior ganho de peso. Os melhores resultados de convers?o alimentar foram obtidos com o uso dos complexos enzim?ticos. No per?odo total, o consumo de ra??o foi menor entre as aves (machos e f?meas) mantidas com a dieta controle positivo, enquanto o maior ganho de peso nos machos foi obtido com a dieta controle negativo contendo 0,04% do complexo B. Quanto ? convers?o alimentar, os machos apresentaram as melhores convers?es com o uso dos complexos enzim?ticos. N?o houve efeito das dietas sobre os rendimentos de carca?a, peito e gordura abdominal. Quando fornecidas dietas com redu??o de 3% da energia metaboliz?vel, o uso dos complexos enzim?ticos ? efetivo na recupera??o do desempenho das aves.Funda??o de Amparo ? Pesquisa do Estado de Minas Gerais (FAPEMIG)Empresa de Pesquisa Agropecu?ria de Minas Gerais (EPAMIG)Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq)Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES)This study was conducted to evaluate the effect of the supplementation of enzymatic complexes on the performance and carcass characteristics of broiler chickens from both sexes. Five diets were evaluated: positive control diet based on corn and soybean meal with meat and bone meal without enzyme; negative control diet formulated with 3% less of metabolizable energy; negative control + 0.05% of complex A (600 U/g of xylanase, 8000 U/g of amylase and 800 U/g of protease); negative control + 0.04% of complex B (200 kNU/g of ?-amylase and 350 FBG/g of ?-glucanase); and negative control + 0.04% of complex B + 0.01% of enzyme C (1000 FXU/g of xylanase). No significant differences were found in the performance of birds from 1 to 7 days of age. From 1 to 21 days of life, males consumed more ration than females. Diets four and five resulted into better weight gains only for males. The best results of feed conversion were obtained with the use of the enzymatic complexes. In the total period, males and females that received the positive control consumed less ration than the other diets. Diet four provided the best weight gain result for males. In relation to feed conversion, males presented the best conversion rate from the use of enzymatic complexes. Females that received diet one and diet five presented better feed conversion rates. No significant differences were observed for the effect of diets on the carcass, breast and abdominal fat yields. It could be concluded that the use of the enzymatic complexes was effective in recovering the performance of birds but decreasing 3% of the metabolizable energy

Aspartic protease supplementation enhancing the performance, carcass characteristics, nutrient digestibility and economic viability, without changing blood parameters and salivary cortisol of pigs

Abstract Aiming to study the performance, carcass characteristics, nutrient digestibility, blood parameters, salivary cortisol levels, and economic viability of pigs administered aspartic protease, a total of 135 pigs were housed in pens in a randomized block design, divided into five treatments with nine replications. The experimental diets were positive control (PC), basic diet with a 5.0% reduction in protein and amino acid requirements; negative control (NC) with a 7.5% reduction in protein and amino acid requirements; NC + 100 g/mT of aspartic protease (NC100); NC + 150 g/mT of aspartic protease (NC150); and NC + 200 g/mT of neutral serine protease (NC200). The inclusion of protease, independently of the source and amount, increased the average daily weight gain (P  0.05) in the blood parameters or salivary cortisol levels were found. Regarding economic viability, proteases increased the profitability, with NC150 leading to the best results. Thus, the use of aspartic proteases is recommended to improve performance and further facilitate pork production