Twenty-seven week-old commercial laying hens were allotted to a completely randomized design with a 3×3 factorial arrangement with three replicates of six birds per treatment. The factors consisted of hree methods for estimatingamino acid ingredient composition (Brazilian tables, prediction equations and factor for correcting amino acid in function of ingredient protein level) and three amino acid recommendations, being two for digestible amino acids and one for total amino acid. Methods for estimation amino acid ingredients composition had effect only on […]

The digestibility coefficients and the true digestible amino acids content of soybean and soybean by-products were determined using cecectomized adult cockerels. Each one of the 8 feedstuffs evaluated was fed to six cockerels, consuming 15 g at 8:00 A.M. and 15 g at 16:00h P.M., after 24 hours fasting. Simultaneously, six cockerels were fasted to determine metabolic and endogenous losses. After determination of the digestibility coefficients and calculation of the digestible amino acids, prediction equations were simulated to predict the […]

The digestibility coefficients and thetrue digestible amino acids contents of corn and corn byproducts were determined by using cecectomized adult cockerels. Each one of the 11 feedstuffs evaluated was fed to six cockerels, consuming 15 g at 8a.m. and 15 g at 4p.m. after fastening by 24 hours. Simultaneously, six cockerels were fasted to determine metabolic and endogenous losses. After determination of the digestibility coefficients and calculation of the digestible amino acids, prediction equations were simulated to predict the corn […]

The objective of this experiment was to evaluate the laying hens performance fed diets with different levels of lysine and sulfur amino acids digestible. A total of hundred and forty-four 24-week-old hens was allotted to a complete randomized design with three treatments, each with eight replicates of six hens. A corn-soybean positive control diet with high amino acids digestibility (HD) was compared to another diet using various by-products to partially replace corn and soybean meal. The second diet was formulated […]