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Search Results: 1 - 10 of 493391 matches for " Andréa Machado Leal;Vieira "
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Inclus?o de ácidos graxos de cadeia curta em diferentes níveis de cálcio na dieta de frangos de corte
Vieira, Maitê de Moraes;Kessler, Alexandre de Mello;Ribeiro, Andréa Machado Leal;
Ciência Rural , 2010, DOI: 10.1590/S0103-84782009005000240
Abstract: ninety six cobb male broilers from 21 to 31 days of age were fed including short chain fatty acids (scfa) and different level of calcium. calcium (ca), phosphorus (p), balance, dry, organic and mineral matter metabolizability, crude energy and crude protein metabolizability, tibia ash percentage and animal performance were measured. experimental diets were assigned in a 5x4 factorial arrangement (without acids, formic acid, acetic acid, propionic acid and butyric acid) x (0.40, 0.59, 0.78 and 0.97% of ca) in a randomized completely design. increasing ca levels affected positively and in a quadratic form ca and p balance and the best levels were estimated at 0,87% and 0,75% of ca dietary, respectively and affected linearly dry, organic matter metabolizability and tibia ash percentage. however, the efficiency of ca retention was decreased quadratically with the increase of ca level. the scfa did not show detectable effects on the studied responses, and no interaction with dietary levels of ca used. the estimated ca requirement considering calcium balance was 0.87%.
Feeding different levels of vitamin E and selenium has no effect on serum immunoglobulin Y (IgY) production by layers vaccinated against Escherichia coli and avian encephalomyelitis virus
Kindlein, Giselle;Ribeiro, Andréa Machado Leal;Canal, Cláudio Wageck;Vieira, Maitê de Moraes;
Ciência Rural , 2007, DOI: 10.1590/S0103-84782007000500024
Abstract: the effects of vitamin e and selenium (se) supplementation on the immunity of hens vaccinated against a mixture of six swine-pathogenic escherichia coli (ec) and avian encephalomyelitis virus (aev) were studied. antibody production (abp) was evaluated in ninety 49 to 57-week-old h&n nick chick hens fed diets containing 14iu vitamin e kg-1 (basal diet), 27, 59, 111, or 111iu vitamin e kg-1 + 0.56ppm se supplementation. at 51 wks of age, half of the hens were vaccinated against ec, and all birds were vaccinated against aev. at 53-weeks of age, the birds received a second dose of ec vaccine. blood samples were collected weekly and serum was analyzed by elisa for anti-ec igy and was expressed as optical density (od). vaccinated hens had higher serum od than the non-vaccinated hens (p£0.05). vaccinated hens fed 27 and 59iu of vitamin e/kg had a higher (p<0.05) serum od than hens fed 111iu + se. neither ec nor aev seem to be appropriate models for the study of the influence of micronutrients on immune responsiveness of older hens.
Metodologias de avalia??o do valor nutricional do farelo de arroz desengordurado para suínos
Kunrath, Marco Ant?nio;Kessler, Alexandre de Mello;Ribeiro, Andréa Machado Leal;Vieira, Maitê de Moraes;Silva, Gabriel Luz da;Peixoto, Felipe D'ávila;
Pesquisa Agropecuária Brasileira , 2010, DOI: 10.1590/S0100-204X2010001000017
Abstract: the objective of this work was to compare the substitution method and the regression analysis method to determine the nutritional value of defatted rice bran in diets for swines at growing and finishing phases. two digestibility bioassays were carried out with 16 barrows with initial body weight of 50.0±3.1 kg, in the growing phase, and 16 barrows with initial body weight of 95.0±3.8 kg, in the finishing phase, housed in metabolic cages. a completely randomized design was used with four treatments - 0, 15, 30 and 45% of substitution of the reference diet by defatted rice bran - and four replications, with one animal as the experimental unit. the regression analysis was more accurate than the method of substitution to assess the nutritional value of defatted rice bran. throught this analyse, the apparent digestibility coefficients of dry matter, organic matter, crude protein and metabolizable energy of defatted rice bran were, respectively, 57.7, 64.8, 56.6% and 2,429 kcal kg-1 on growing phase, and 57.7, 64.7, 62.6% and 2,233 kcal kg-1 on finishing phase.
Efeito da transforma??o do ninho manual modelo holandês em mecanico na postura de ovos de cama em matrizes de frangos de corte
Pilotto, Fernando;Ribeiro, Andréa Machado Leal;Cargnelutti Filho, Alberto;Klein, Vilson Antonio;
Revista Brasileira de Zootecnia , 2010, DOI: 10.1590/S1516-35982010001000030
Abstract: this experiment aimed at adapting the dutch manual nest model, whose format is well accepted by the parental broiler lines, to a new model aiming the mechanical egg collection. adaptation consisted on replacing wood shaving by stuffed wood sheet and the placement of a conveyor belt for egg collection. this adaptation was evaluated in two experiments in the same shed with breeders from 25 to 35 weeks of age. in both experiments, there were 69 available modules, each one with 24 nests (manual nest) for collection of eggs from 7,690 hens and one adapted module with 24 nests (mechanical nest) for mechanical collection of eggs from 110 hens. in experiment 1, weekly percentages of produced eggs and floor eggs were compared and in experiment 2, besides those variables, percentages of cracked eggs and dirty eggs in the nest were observed. also in experiment 2, aiming to reduce floor eggs observed in experiment 1, wood shavings were added on the stuffed wood sheet, from lodging to the 26th week. it was used a 2 ? 11 factorial design, in which the main plot was constituted by the mechanical and manual nests and the sub-plots were composed of the eleven weeks of evaluation. the weekly percentage of produced weeks was similar for the two nest types, in both 1 and 2 experiments. percentage of floor eggs (experiments 1 and 2), dirty eggs and cracked eggs (experiment 2) obtained with mechanical nest were worse than with manual nest. in experiment 2, placement of wood shavings in the mechanical nest did not contribute for reduction on floor egg percentage. transformation of manual nest to mechanical nests increased the number of floor, dirty and cracked eggs, showing a worse acceptance of this type of nest by the hens.
Desempenho e composi??o corporal de frangos de corte alimentados com diferentes níveis de proteína e de aminoácidos ou com livre escolha das dietas
Kolling, Ana Valeria;Kessler, Alexandre de Mello;Ribeiro, Andréa Machado Leal;
Revista Brasileira de Zootecnia , 2005, DOI: 10.1590/S1516-35982005000100013
Abstract: an experiment was carried out to evaluate the effect of diets with different protein levels and energy:protein ratio and amino acids on the performance and body composition of broilers (300 males and 300 females from 1 to 49 days of age), as well as the effect of these factors on the nutrients utilization efficiency. three isoenergy experimental diets (d) were used (3000 and 3150kcal me/kg for starter and growing phase, respectively) varying the levels of crude protein (cp) and the first 4 essential amino acids (aa) (lysine, methionine+cysteine, threonine and tryptophan): d1, control, with 22%cp; d2: 24%cp and 20% more aa than d1 (highcp+20%aa) and d3, 20% cp and 12% less aa than d1 (lowcp-12%aa). on the growing phase the cp were 20, 22 and 18% for d1, d2 and d3, respectively, keeping the same aa proportion. a fourth diet was defined by free-choice between diets d2 and d3. birds were alloted in a completely randomized design, in a 2 x 4 factorial (sex x diets) scheme and 5 replications of 15 birds each per treatment. comparative slaughter technique was used for body fat and protein gain. birds fed lowcp-12%aa diets showed reduced feed conversion, gain and body protein gain, but better protein intake-to-gain ratio. broilers fed highcp+20%aa diets had worse protein intake-to-gain ratio, but similar weight gain, cuts or carcass weight to control or free-choice birds. fat and protein gain were similar among those 3 treatments. free-choice birds showed the same performance and body composition of the control broilers. lowcp-12%aa diet was worse for broilers in starter phase than in growing phase. male broilers were more efficient than females using nutrients, specially in the growing phase.
Níveis de Energia e Peletiza??o no Desempenho e Rendimento de Carca?a de Frangos de Corte com Oferta Alimentar Equalizada
Meinerz, Cibele;Ribeiro, Andréa Machado Leal;Penz Jr, Ant?nio Mario;Kessler, Alexandre de Mello;
Revista Brasileira de Zootecnia , 2001, DOI: 10.1590/S1516-35982001000800011
Abstract: an experiment was conducted to evaluate the effect of energy levels (2900-le and 3200-he- kcal me/kg), physical form of the diet (mash-m and pellet with 2 mm-p2 and 4 mm-p4) and pair feeding (pf), by feed restriction based in ad libitum (ad)/m/he diets, on male broilers performance and carcass yield, from 21 to 42 days of age. there were 8 treatments, 5 replicates, 12 birds/replicate. in the p diets, only whole pellets were offered. at these conditions, there were no differences on performance and carcass parameters between p2 and p4 diets, although p2/le showed less fines (12%) than p4/le (27%). pair-feeding m/he and p2+p4/le resulted in similar weight gain (wg) (p<0,05), but better caloric efficiency (ce) (p<0,06) for m/he. among le diets, although fi was lower in p/pf (<0.001) when compared with m/ad, there was no differences for wg, fe (feed efficiency) and ce. comparing energy and diet form, the p/le/ad diets gave a greater fi, wg, abdominal fat and better ce, but worse fe compared with m/he/ad. also had more economic return compared with m/ad, in both energy levels. the pelleting process seems to be more profitable with low energy diets.
Efeito da composi??o do farelo de soja sobre o desempenho e o metabolismo de frangos de corte
Gerber, Luiz Fernando Pigatto;Penz Júnior, Ant?nio Mário;Ribeiro, Andréa Machado Leal;
Revista Brasileira de Zootecnia , 2006, DOI: 10.1590/S1516-35982006000500015
Abstract: it was studied the effect of soybean meal (sbm) composition, varying in cp (sbm44%, sbm46% and sbm48%), on performance, metabolism and intestinal micrometry of broilers. three sbm were produced from the sbm with 48.4% cp and increasing levels of toasted soybean hulls. three hundred and twelve birds were assigned to three treatments with eight replicates. the diets were formulated for three periods: 1 to 7 days, 8 to 21 days and 22 to 42 days of age. all dietary treatments were isoenergy and isoprotein. from 1 to 7 days of age, no treatment effect on bird performance was observed. however, from 8 to 21 days of age, the birds fed sbm48% showed the best weight gain (wg) and feed conversion (fc). in the period from 1 to 21 days of age, the broilers fed sbm48% showed higher body weight and wg and better fc than those fed sbm44%. in the period from 22 to 42 days of age, the birds on all dietary treatments showed similar performance. the metabolism parameters evaluated at both periods (3 to 7 and 39 to 42 days of age) showed that the sbm48% treatment promoted a significantly higher coefficient of metabolizability of ge and dm than sbm44% treatment. no treatment effect on villi height, cript depth and number of intestinal villi was observed.
Compara??o do valor nutritivo de farinhas de sangue e de farinhas de vísceras para suínos utilizando-se o método da proteína e gordura digestíveis e o método de substitui??o
Henn, Jo?o Dionísio;Ribeiro, Andréa Machado Leal;Kessler, Alexandre de Mello;
Revista Brasileira de Zootecnia , 2006, DOI: 10.1590/S1516-35982006000500016
Abstract: two experiments (exp) were carried out with 49 and 65 kg barrows (exp 1 and 2, respectively) to determine digestible energy (de) values of three sources of blood meals (exp 1): conventional (cbm), flash dried (fdbm) and spray dried red blood cells (sdrbc), and of three poultry by-product meals (exp 2) (pbm-10.1, pbm-12.7, and pbm-16.7% of ash content) by an alternative method to the replacement method (sbm). the method was based on the starch basal diet replacement with increasing levels of ingredient test (7 and 14%). digestibility coefficients of protein (dcp) and fat (dcf) were obtained by the regression analysis between the percentage of added protein (or fat) in the basal diet and the dietary digestible protein (or digestible fat) percentage. total feces collection was performed, during 5 days, for the digestibility assays, after 4 days of adaptation. another treatment consisted of starch basal diet replacement with 25% of cbm or pbm-10.1 to determine de by sbm. the dcp, de and ame were of 30%, 1,432, and 1,246 kcal/kg for cbm; 86.7, 4.185, and 3,648 kcal/kg for fdbm and 84.6%, 4,041, and 3.512 kcal/kg for sdrbc, respectively. regression lines difference was found between cbm and the other two sources. de of cbm measured by sbm was of 988±268 kcal/kg. for pbm-10.1, pbm-12.7 and pbm-16.7, dcp, dcf, de and ame were, respectively, 93.0, 87.6, 4,106, 3,719, 96.4, 85.6, 4,390, and 3,987 and 84.3%, 80.5%, 3,925, and 3,580 kcal/kg. regression lines difference was found between pbp-16.7 and the other two sources for dcp. for dcf lines, no differences were found. de value of pbm 10.1, measured by sbm, was of 4,057±164 kcal/kg. it is probable that sbm underestimate ingredient de, specially for those with little palatability, as blood meals. the alternative method is a good option for de calculations.
Uso de gemas de ovos de aves hiperimunizadas contra Escherichia coli suína no controle da diarréia neonatal de leit?es
Ribeiro, Andréa Machado Leal;Rudnik, Liliane;Canal, Cláudio Wageck;Kratz, Lilian Ribeiro;Farias, Carolina;
Revista Brasileira de Zootecnia , 2005, DOI: 10.1590/S1516-35982005000400019
Abstract: the effect of yolks from birds hipperimmunized birds against escherichia coli (e. coli) pathogenic for swine on the passive immunity of newborn piglets in a producer unit of piglets was studied. it was evaluated elisa optical density (od) of antibodies against e. coli, body weight and the frequency of diarrhea (fcd) in 137 newborn piglets born from 25 primiparous gilts non-vaccinated against e. coli. the gilts were considered blocks. from each gilt, six piglets from both sexes were separated, excluded the lighter and the heavier ones, and divided into three treatments and two replications. the treatments were supplied orally, as follows: t1: 2 ml of pbs (control treatment) in 2 doses, the first was given at birth and the second 2 hours later; t2: 2 ml of yolks with titer of 100,000 of antibodies (igy) against e. coli in the same two doses; t3: equal to t2, followed by 2 ml of yolks every 3 days until piglets reached 12 days old. old two blood samples were collected from 1 piglet/treatment/gilt: 24 hours after birth and when piglets were 14 days old. the ammount of igy against e. coli in the serum of piglets was also determined by elisa. the od for t2 and t3 was significantly higher in the first 24 hours and 14 days after birth compared to the control . t3, t2 and t1 remained 87, 79 and 73% of the studied period without diarrhea. due to the lower fcd percentage, t3 piglets were significantly heavier than t1, but did not differ from t2. the results of this study pointed out that the supply of hipperimmunized hen yolks against e. coli acts effectively in diarrhea prevention and that the continuous supply is more effective than the supply only at birth.
Formula??o com aminoácidos totais ou digestíveis em ra??es com níveis decrescentes de proteína bruta para frangos de corte de 21 a 42 dias de idade
Viola, Teresa Herr;Ribeiro, Andréa Machado Leal;Beretta Neto, Carlos;Kessler, Alexandre de Mello;
Revista Brasileira de Zootecnia , 2008, DOI: 10.1590/S1516-35982008000200017
Abstract: two experiments (exp) were carried out to evaluate diets for broilers formulated with reducing crude protein (cp) level, supplemented with synthetic amino acids, formulated based on total amino acids (taa) (exp 1) or digestible aa (daa) (exp 2). the experiments conducted in the period from 3 to 6 weeks of age of the birds. in both experiments, the four levels of cp were: 20.8, 19.7, 18.6 and 17.5% cp. in the experiment 2, two other treatments were added: diets containing 20.8 and 17.5% cp and high digestibility (hd), based on corn, soybean meal, corn starch and soy protein isolate. in both experiments, the feed intake was not affected by cp decreasing. in exp1, weight gain (wg), feed conversion (fc), breast and drumstick yield were negatively affected by cp reduction, meanwhile in exp 2 those variables were not affected. however, in both experiments, in the week from 21 to 28 days of age, wg and fc were negatively influenced by cp decrease. as the cp levels decrease, the dry matter (dm) and organic matter (om) digestibility increased in the exp 2, due to the smaller inclusion of soybean meal. in both experiments, the relative protein retention was greater for rations with low cp levels. in exp 2, although of the different cp levels did not affect the performance, the hdig diets promoted higher om digestibility and tended to have higher dm digestibility. the rations with 17.5%cp level and hdig promoted a more positive protein balance and higher relative protein retention as compared to the standard digestibility. considering all the results, formulation with daa showed advantages related to taa.
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