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

Replacement of raw soybean with roasted soybean increased milk production in Holstein cows

ABSTRACT: The aim of this study was to evaluate the effect of total replacement of raw whole soybean (RAW) for roastedwhole soybean (ROS) on the production performance of Holstein cows. Two experiments were carried out usinga simple reversal design where RAW has been completely replaced by ROS. In experiment 1, 22 cows (175±60 days in milk)were used, and the dietary inclusion level of RAW or ROS was 3.7% of dry matter (DM). In experiment 2, 16 cows (130±50 days in milk)were used, and thedietary inclusion level of RAW or ROS was 11% of DM. In both experiments, ROS increased milk production by 1.1kgday-1 without changing fat and protein production. Dry matter intake or milk urea nitrogenwere not affected by dietary soy source. In experiment 2, plasma glucose concentration was decreased, and allantoin/creatinine ratio in urine tended to decreasein ROS. Experiment 2 also evaluated the nutrient digestibility and ruminal degradation kinetics of crude protein in two soybean sources. Roasting had no effect on the digestibility of DM, organic matter, and neutral detergent fiber. Roasted whole soybean hadgreater fraction B and lower protein degradation rate than did RAW; this showed that heat treatment was effective in increasing therumen undegradable amino acid flowto the animal, which suggesteda potential mechanism of action for improved performance observed in ROS