An experiment was carried out to estimate the optimum level of digestible threonine for white-egg and brown-egg laying hens in the second laying cycle. It was used 360 laying hens, 180 were white-egg and 180 were brown-egg laying hens which were distributed in a complete randomized design in 5 x 2 factorial arrangement (5 levels threonine x 2 lines of laying hens). The levels of digestible threonine used were the following: 0.380, 0.413, 0.445, 0.478 and 0.511%. It was evaluated […]

The purpose of this study was to evaluate the effect of ractopamine and chromium-methionine additions and their combinations in diets for growing and finishing swines on performance, carcass traits and meat quality. Sixty-four Topigs line swines at 26.56 ± 3.11 kg initial body weight were distributed in a randomized block experimental design in a 2 x 2 factorial scheme with two levels of ractopamine (0 and 5 ppm) and two levels of chromium-methionine (0 and 400 ppb), totaling four diets […]

Two experiments were conducted to evaluate organic and inorganic sources of zinc and copper and their effects on performance of piglets weaned at 21 days of age. In each experiment, it was used 90 piglets in a randomized block experimental design with five diets and six replications and three animals per plot. The diets used in experiments 1 and 2 contained 120 ppm zinc and 10 ppm copper as sulfate. The diets of experiment 1 were supplemented with 0, 300, […]

This study was conducted to evaluate, in the ration, the use of fish meal supplement with amino acids on performance, carcass characteristics, and on hematological analysis in Nile tilapia juvenils. It was used 140 juveniles with an average weight of 14.0 ± 0.14 g, randomly distributed in a complete random design with five levels of fish meal (0; 1.5; 3.0; 4.5; and 6.0%) in the ration, each one with four replicates. The rations were isoenergetic (3,000 kcal of digestible energy) […]

This experiment was conducted aiming to verify the effect of four levels of calcium (Ca) and available phosphorus (aP) in the diet on the performance, quality of eggs and the mineral excretion in Japanese quails during the final third of the production cycle. A total of 384 quails at 313 days of age was used. They were distributed in a complete random design in a 4 × 2 factorial scheme composed of four levels of calcium (2.0, 2.5, 3.0, and […]

Three experiments were carried out to evaluate the effect of probiotic on performance and intestinal health of chicks. It was used in the first experiment 300 fertilized eggs, in which water (placebo) or probiotic solution containing 10 mg of probiotic (Enterococcus faecium, Lactobacillus casei and Lactobacillus plantarum, 106ufc/g) were inoculated. In Experiment 2, it was evaluated the efficiency of probiotic (Bacillus subtilis) supply in the diet for chicks challenged with Salmonella Enteritidis on the first day of age. In the […]

Small ruminant production is the main source of income of farmers living in arid and semiarid regions. Sheep and goats raised in these areas are generally confronted with severe nutritional deficits during food scarcity period which exacerbate disease and health problems and consequently low productive and reproductive performances. These areas are characterized by rainfall seasonality and scarcity resulting in a low fodder potential. Therefore, native rangelands are degrading due to overgrazing, high stocking rates and mismanagement. Options to improve small […]

The optimal dietary supply of amino acids to tilapia has been studied for many years. Nevertheless, a general agreement on the amino acid requirement for tilapias has not been established. In order to optimize efficiency and reduce surplus nitrogen, values of digestibility of each amino acid of feed must be considered. Due to variations in the amino acid requirement due to new tilapia strains introduction, continuous research on amino acid requirements is necessary to elaborate economical and environmental sustainability diets, […]

The objective of this study was to evaluate performance, quantitative characteristics of carcass, and visceral responses of barrows maintained on heat stress enviroment and fed diets supplemented with ractopamine. It was used 48 animals with initial weight of 67.3 ± 3.8 kg, distributed in a randomized block design with four levels of ractopamine (0, 5, 10 and 20 mg/kg), each one with six replicates with two animals each. The experimental period lasted 28 days. Air temperature was 31.8 ± 2.0ºC, […]

The purpose of this work was to evaluate three levels of use of glycerol (0, 3, 6 and 9%) a byproduct of biodiesel production, in the diets of growing and finishing swines on performance, on carcass traits and on meat quality. A total of sixty-four Topigs pigs with 33.27 ± 4.66 kg initial body weight were distributed in 32 pens accordingly to the initial weight in a complete random block design with eight replicates (blocks) per level of glycerol. In […]