ABSTRACT – An experiment was carried out to verify the influence of different levels of energy, vitamin D3 and sodium: chloride ratio on the performance, eggshell quality and on determined blood constituents of 192 laying hens Hy-Line W36, aged 72 weeks, allotted to a 48 experimental units with four hens each. A completely randomized experimental design was used in a factorial arrangement (3 x 2 x 2), metabolizable energy levels (2900, 3000 and 3100 kcal/kg), vitamin D3 levels (500 and […]

ABSTRACT – This experiment was carried out to evaluate the requirement of crude protein for initial growing crossbred barrows (Landrace x Large White), from 15 to 30 kg, maintained in thermal comfort. During the experimental period, the room temperature was maintained at 23.1±1.19°C, with relative humidity at 80.6±4.59% and Black Globe Index Humidity at 69.8±1.38. Sixty crossbred barrows with initial average weight of 14.8±0.85 kg and final weight of 29.3±2.4 2kg, were used. A completely randomized blocks design, with five […]

ABSTRACT – The objective of this trial was to compare the efficiency of phytase with an inorganic phosphate (dicalcium phosphate) when added to diets with or without defatted rice bran (DRB). One hundred and twenty eight pigs (50% barrows and 50% gilts) were housed in collective cages to evaluate the animals performance in the growing phase, and to determine the digestibility of the calcium and phosphorus using chromium oxide as an indicator and the concentration of calcium and phosphorus in […]

ABSTRACT – Two nutrition programs were tested on Mangalarga Marchador foals: TA: supplementation with concentrate from 2 to 12 months of age and TB: supplementation from weaning to 12 months of age. Animals from TA and TB were kept in either one of the available feedlots: one of coast cross (Cynodon dactylon x Cynodon nenfluensis) + Cynodon nenfluensis grasses and the other of coast cross (C. dactylon x C. nenfluensis) only. Monthly the animals were weighed (W) and measured: height […]

With the objective to evaluate two feeding programs (4 and 3 phases), on the performance and carcass yield of two commercial strains (Hubbard and Arbor Acres), 1,600 1-d chicks were used, 800 of each strain. A completely randomized design, in a 2 x 2 x 2 (program x strain x sex) factorial arrangement, with four replicates, was used. During the period from 1 to 46 days period, no effects were verified due either to programs or strains on weight gain […]

With the objective to determine the methionine+cystine requirements, 1440 and 1080 commercial Hubbard broilers were used, 50% of each sex at the growing and finishing phases, respectively. Six supplemental levels of DL-methionine (.0, .06, .12, .18, .24, and .30%) were added to methionine+cystine deficient basal diets. Body weight gain, feed intake, feed:gain ratio, carcass yield and composition, abdominal fat and plasma uric acid concentration were evaluated from 22-42 and 43-56 days of age. Based on the statistical analysis of the […]

An experiment was carried out to determine the nutritional threonine requirement for white-egg and brown-egg laying hens, during a period from 21 to 36 weeks. Five hundred and seventy six laying hens, 288 from white-egg and 288 from brown-egg, were used during four experimental periods of 28 days each. A complete randomized blocks design in a fatorial arangement (level x trademarks), with six replicates (eight birds/replicate), was used. The treatments consisted on a basal diet with 14.2% crude protein supplemented […]

The objective of this work was to test the computerized monitoring of the in vitro gas production system. This technique made easy the degradation studies of soluble and insoluble fractions of forages, determined by the gas production (CO2 e CH4) from microbial metabolism and measured by a pressure sensor. Several amounts of samples (50 to 110 mg of alfalfa hay) and other feedstuffs were tested. Also, the influence of the amount of ruminal liquid (2.0 or 3.0 mL), with or […]

ABSTRACT – The objective of this work was to compare the computerized monitoring of the in vitro gas production system with the in vivo and in situ methods. On the comparisons, corn silage with high/low dry matter contents, with/without inoculation, were used. The digestibility of silage with high dry matter (DM) content, with/without inoculation, did not present differences among the analyzed methods. When evaluated apart from the inoculation effect, that silage differed in vitro/gas and in situ methods; however in […]

ABSTRACT – The objective of this work was to evaluate the computerised monitoring of the in vitro gas production system and to compare with in vivo and in situ methods. In the degradation methods, corn silage samples with high/low dry matter (DM) contents, with/without inoculate, were used. Evaluating the silage degradation, by the gas production on the fermentation, the results of the extension of degradation (A+D) were 21.5; 22.6; 22.1 and 20.9 mL of gas/100 mg DM, without significant difference. […]