Objetivou-se determinar a composição química, os valores energéticos e os coeficientes de digestibilidade ileal verdadeira de aminoácidos de sojas integrais tostadas de cinco regiões. No primeiro experimento, foram utilizados 288 pintos de corte machos da linhagem Cobb 500, com 13 dias de idade e peso médio de 420,0±5,0g. O delineamento experimental utilizado foi inteiramente ao acaso, com seis tratamentos (cin...
Chemical composition, minerals, aminoacids, apparent digestibility of crude protein (ADCP), digestible protein (DP), digestible energy (DE) and metabolizable energy (ME) of 20 feedstuffs were determined in seven metabolism trials. A total of 162 crossbreeds (L × LW) barrows were used, 81 at 29.3 kg and 81 at 69.7 kg live weight. The animals were housed individually in metabolic cages. The digestibility of prote...
Three experiments were conducted to determine the nutritional requirements of potassium (K) for male Ross broiler chickens, from 8 to 21, 22 to 42 and 43 to 53 days of age. The following parameters were evaluated: body weight gain (BWG), feed intake (FI) and feed conversion ratio (FCR). In each experiment, a completely randomized experimental design was used, with six treatments (K levels), and six, eight and e...
The aim of this study was to evaluate the effect of dietary lysine on performance, protein deposition and respiratory chain gene expression in male broilers. A total of 252 Cobb 500 broilers were distributed, in a completely randomized design, into four treatments with seven replicates of nine birds per experimental unit. Experimental treatments consisted of diets based on corn and soybean meal, with four level...
The objective of this study was to determine the efficacy and the phosphorus equivalency of two bacterial phytases (Citrobacter braakii-derived phytase or genetically-modified Escherichia coli phytase) in the diets of broiler chickens from 1 to 21 days of age. A total of 2100 male broiler chickens were randomly distributed in 10 treatments with 10 replicates of 21 chicks each. A basal diet was formulated contai...
Three experiments were conducted to evaluate the effect of β-mannanase (BM) supplementation on the performance, metabolizable energy, amino acid digestibility, and immune function of broilers. A total of 1,600 broilers were randomly distributed in a 4 × 2 factorial arrangement (4 nutritional levels × 0 or 500 g/ton BM), with 10 replicates and 20 broilers per pen. The same design was used in the energy and diges...