The experiment was conducted to evaluate the effect of different energy levels and feeding programs on performance of broilers from 42 to 57 days of age. One thousand and six hundred 1-d male chicks (Cobb) were assigned to a completely randomized design with 2 x 4 factorial arrangement (two levels of energy: 3,200 and 3,600 kcal ME/kg and four different feeding programs: amino acid recomendations). From 1 to 41 days of age all birds were fed the same corn and […]

Two trials were carried out to evaluate the effects of feeding of increasing defatted corn germ meal (DCGM) levels to broilers. In the first trial, for determination of nutritional value by method of total excreta collection, 120 19-day old broilers were allotted to a completely randomized design with three treatments and four replications of 10 birds each. The treatments consisted of corn and soybean meal-based diets with increasing DCGM levels: 0, 20, and 40%. Mean values of coefficients of metabolization […]

It was evaluated the values of apparent metabolizable and apparent corrected energy (AME and AMEn, respectively), the coefficients of metabolization of gross energy (MCEC and MCECn) and the digestibility of DM and OM (ADDMC and ADOMC) of some feedstuffs for greater rhea averaging seven months old, by the techniques of total feces collection and chromium oxide as external marker. The experiment was analyzed as a complete randomized design with six treatments and three replications per experiment. The experiment was carried […]

One experiment was carried out to determine the energy value of feeding fats (refined soybean oil, refined canola oil, refined sunflower oil, poultry fat, fish oil and lard) for broilers. One hundred and sixty eight broilers averaging 22 days old were allotted to a complete randomized design with seven treatments and four replicates of six broilers. The experiment lasted 8 days, with three days for adaptation and five days for excreta collection. The control replaced 20% of basal diet, as-fed […]

An experiment was carried out at Universidade Federal de Viçosa to determine the metabolizable energy values of different samples of feather meal and poultry by-product meal with different levels of inclusion and at different poultry ages. The ten treatments used to determine energy consisted of a reference diet and ten test diets, obtained with the replacement of reference diet by five levels (5, 10, 20, 30 and 40%) of feedstuffs. The metabolism trials (total fecal collection) were carried out in […]

A digestibility assay were carried out to evaluate, in consecutives periods, the total excreta collection method and the chromium oxide method as a marker. Apparent metabolizable energy corrected by nitrogen retention (AMEn) and aparent digestibility of dry matter coefficient (ADDMC) of broiler diet based in a ground corn and soybean meal containing 19% crude protein and 3.100 kcal ME/kg. Sixty adult Leghorn cockerels weigh, in average, 2.350±105 g were used. Each cockerel participates in the evaluation of the two methods […]

This work was conducted to determine the N-corrected apparent metabolizable energy (EMAn) of different carbohydrate sources for broilers from 1 to 7 days, and to evaluate the utilization of these ingredients in the diet of newly hatched broilers based and on live performance and on the gastrointestinal tract (TGI) development. Total excreta collection method was used in trial one, with 220 male chicks from 4 to 7 days, allocated to batteries in a completely randomized design with five treatments (a […]

The purpose of this study was to determine the N-corrected apparent metabolizable energy (EMAn) of alternative protein ingredients, for newly hatched chicks, and to evaluate the effects of the utilization of these ingredients in the first week broiler feed, on the performance and gastrointestinal tract (TGI) development. In the metabolism trial, 288 male chicks from 4 to 7 days were allotted to a completely randomized design with six treatments (a reference diet and five diets with inclusion of the test […]

Three assays were carried out to evaluate the nutritive value of the barnyardgrass seeds (Echnochloa spp.) for poultry. In the first assay, twelve adult cockerels were used to determine the true metabolizable energy value corrected by nitrogen retained (TMEn), using the forced fed method. In this assay six cockerels were forced fed 30 g of the feed and six cockerels were fastened to determinate metabolic and endogenous losses. In the second assay, twelve cecectomized cockerels were used to determine the […]

A trial involving nineteen zebu steers with initial live weight of 270 kg were conducted with the objective of determining their energy requirements and the efficiency of utilization of the metabolizable energy for gain (kg) and maintenance (km). Four steers were slaughtered at the beginning of the trial, performing the reference group, three were fed at maintenance level and the remaining were uniformly allotted to a complete randomized design, in three treatments, with different levels of concentrate in the diets […]