ABSTRACT The objective of this study was to evaluate whether replacing corn starch (CS) energy with isolated soy protein (ISP) and soybean oil (SO) and the ambient temperature affect the protein and energy requirements for maintenance and gain of European quail. Thus, a total of 432 European quail from 10 to 30 days of age, distributed in a completely randomized design, were used to estimate the protein and energy requirements for maintenance through the comparative slaughter methodology. The treatments consisted […]

The objectives of this trial were to estimate gain composition and energy and protein requirements for weight gain of purebred and crossbred Nellore. Sixty young bulls averaging 10 to 11 months of age from four genetic groups: Nellore, F1 Nellore x Angus, F1 Nellore x Brown Swiss and F1 Nellore x Simental and initial average body weights of 286, 309, 333 and 310 kg, respectively, were used in this study. A completely randomized design was adopted and bulls from the […]

This work was conducted to determine the energy requirements for broilers using the factorial method. The metabolizable energy (ME) requirements for maintenance (MEm) were determined at 13, 23 and 32ºC (±2 C) by the comparative slaughter technique. ME requirements for weight gain were estimated considering the net efficiency of energy utilization for growth and body energy content. The energy requirements for maintenance were of 159.36, 116.17, and 128.66 kcal/kg0.75/day at 13, 23, and 32ºC, respectively, and quadratic effect of temperature […]

The objective of this work was to evaluate the validity of prediction equation of metabolizable energy requirements, that was previously determined at Faculdade de Ciências Agrárias e Veterinárias of UNESP -Jaboticabal. The pullets were distributed in a randomized design with three treatments and six replication of 18 pullets from 3 to 8 wk-age, 15 birds from 9 to 12 wk-age and 12 birds from13 to 18 wk-age. The treatments consisted of comparing the performance of pullets feeding according to: ad […]

Thirty two Santa Gertrudis bulls with ten months of age and 245 kg average live weight were fed 88% concentrate diets with corn silage or sugarcane bagasse and dry corn or high moisture corn. Four animals were slaughtered in the beginning of the experiment for initial body composition determination. Other 28 animals were distributed on four treatments. The experimental design was randomized blocks in 2 X 2 factorial (two roughage X two corn sources) with seven replicates. Regression equation of […]