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Search Results: 1 - 10 of 81135 matches for " Roberta Gomes Mar?al Vieira;Siqueira "
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Equa es de predi o da energia metabolizável da torta de baba u para frangos de corte Predictive equations for metabolizable energy content of babassu for broilers
Jefferson Costa de Siqueira,Dáphinne Cardoso Nagib Nascimento,Roberta Gomes Maral Vieira Vaz,Rubens Fausto Silva
Revista Brasileira de Saúde e Produ??o Animal , 2011,
Abstract: Objetivou-se elaborar equa es de predi o dos valores de energia metabolizável aparente (EMA) e aparente corrigida para o balan o de nitrogênio (EMAn) da torta de baba u (Orbignya martiana) para frangos de corte. Uma revis o da literatura foi realizada para identificar trabalhos que avaliaram a composi o química (matéria seca, proteína bruta, e extrato etéreo,) e os valores energéticos (energia bruta, EMA e EMAn) da torta de baba u para aves. Foram calculados os coeficientes de correla o de Pearson para estudar a associa o entre os componentes químicos e os valores energéticos. Posteriormente, os dados foram submetidos à análise de regress o linear simples e múltipla. Utilizou-se a técnica Stepwise e considerou-se um nível de significancia igual ou inferior a 5%. As equa es recomendadas para corrigir o conteúdo energético da torta de baba u em fun o da sua composi o química, na matéria natural, s o: EMA (kcal/kg) = -3517,25 + 79,78 EE + 1,157 EB (R2 = 0,926; P = 0,019) e EMAn (kcal/kg) = -2909,80 + 71,707 EE + 0,979 EB (R2 = 0,973; P = 0,005). As equa es foram avaliadas mediante cálculo dos coeficientes de correla o (r) entre os valores de EMA e EMAn preditos e aqueles observados em ensaios de metabolismo com aves, de forma que foram observadas altas correla es entre os valores determinados e aqueles preditos para a EMA (r = 0.97) e para a EMAn (r = 0,95). This study aimed to develop equations to predict the values of apparent metabolizable energy (AME) and apparent metabolizable energy corrected for nitrogen balance (AMEn) of babassu (Orbignya martiana) for broilers. A literature review was performed to identify studies that evaluated the chemical composition (dry matter, DM; crude protein, CP; ether extract, EE) and energy values (gross energy, GE, AME and AMEn) the babassu for birds. We calculated the correlation coefficients of Pearson, to check the association between chemicals components and the energy values. Subsequently, data were analyzed by simple and multiple linear regressions using the Stepwise technique, considering a significance level equal or inferior to 5%. The equations recommended to correct the energy content of babassu depending on their chemical composition, on wet matter basis, are: AME (kcal / kg)= -3517.25 + 79.78 EE + 1.157 CE (R2 = 0.927; P = 0.019) and AMEn (kcal/kg) = -2909.80 + 71.707 EE + 0.979 CE (R2 = 0.973; P = 0.005). The equations were evaluated by calculating the correlation coefficients (r) between the values predicted and those observed in metabolism trials with birds. Were observed high correlations be
Níveis de proteína bruta e suplementa??o de aminoácidos em ra??es para leitoas mantidas em ambiente de conforto térmico dos 30 aos 60 kg
Orlando, Uislei Antonio Dias;Oliveira, Rita Flávia Miranda de;Donzele, Juarez Lopes;Ferreira, Aloízio Soares;Silva, Francisco Carlos de Oliveira;Generoso, Rafaela Antonia Ramos;Vaz, Roberta Gomes Maral Vieira;Siqueira, Jefferson Costa de;
Revista Brasileira de Zootecnia , 2005, DOI: 10.1590/S1516-35982005000100017
Abstract: an experiment was conduced to determine the crude protein (cp) level in diets with amino acids supplementation for gilts maintained in a thermal comfort environment. fifty crossbreed crossbred gilts (landrace x large white) with initial average weight of 30.1 kg were allotted to a completely randomized experimental design, with five treatments (19, 18, 17, 16 and 15% of cp with supplementation of lysine, methionine, tryptophan, threonine and valine to maintain the same protein quality) five replicates and two animals per experimental unit. the experimental rations were fed ad libitum until the end of the experiment, when the animals reached the average weight of 60.3 kg. the cp level of the ration influenced the daily weight gain and the feed:gain ratio however the treatments did not influence the daily feed intake. the protein deposition (pd) did not change from 19 to 16% of cp of the diet. however the animals that fed diet with smaller level showed the lowest value of pd. the treatments did not influence the absolute and relative weights of all evaluated organs. it was concluded that the crude protein level, for gilts from 30 to 60 kg, maintained in thermal comfort environment can be reduced from 19 to 15% with no negative effect on performance since rations are supplemented with limiting essential amino acids
Níveis de treonina digestível em ra??es para leitoas dos 15 aos 30 kg mantidas em ambiente de alta temperatura
Saraiva, Edilson Paes;Oliveira, Rita Flávia Miranda de;Donzele, Juarez Lopes;Silva, Francisco Carlos de Oliveira;Vaz, Roberta Gomes Maral Vieira;Siqueira, Jefferson Costa;Manno, Maria Cristina;Oliveira, Will Pereira de;
Revista Brasileira de Zootecnia , 2006, DOI: 10.1590/S1516-35982006000200021
Abstract: this trial was conducted to evaluate the dietary levels of digestible threonine for growing gilts on heat stress environment. seventy crossbreed gilts averaging initial weight of 14.9 ± 0.56 kg were assigned to a complete randomized blocks design with five treatments (levels of digestible threonine) of seven replications (two animals per experimental unity). the treatments consisted of the following dietary digestible threonine levels: 0.538, 0.577, 0.614, 0.651, and 0.688%. daily weight gain and threonine intake linearly increased as the dietary threonine level increased, whereas daily feed intake was not affected. although feed:gain ratio linearly changed with the treatments, the best dietary digestible threonine level was estimated in 0.587%. daily depositions of protein and fat in the carcass and absolute and relative weights of the evaluated organs were not affected by the treatments. it was concluded that gilts from 15 to 30 kg on heat stress environment require 0.587% of digestible threonine in the diet to obtain better feed:gain ratio, leading to a threonine digestible: digestible lysine ratio of 63%.
Exigências de aminoácidos sulfurados digestíveis para suínos machos castrados, mantidos em ambiente de alta temperatura dos 15 aos 30 kg
Vaz, Roberta Gomes Maral Vieira;Oliveira, Rita Flávia Miranda de;Donzele, Juarez Lopes;Ferreira, Aloízio Soares;Silva, Francisco Carlos de Oliveira;Kiefer, Charles;Siqueira, Jefferson Costa de;Rezende, Wilkson de Oliveira;
Revista Brasileira de Zootecnia , 2005, DOI: 10.1590/S1516-35982005000500025
Abstract: sixty swine (landrace x large white) with initial weight of 14.97 ± 0.33 kg and 50.36 ± 3.29 days old were allotted to a blocks randomized experimental design, with five treatments (0.465, 0.511, 0.558, 0.605, and 0.652% digestible methionine + and cystine)and six replicates of two animals, to determine the sulphurous amino acids requirements for barrows on a high temperature environment from 15 to 30 kg. diets and water were fed ad libitum until the end of the experimental period, when the animals reached the weight of 29.87 ± 0.52 kg. the average temperature inside the room was maintained in 30.9 ± 0.7oc and the relative humidity in 67.5 ± 7.2%. the black globe humidity index calculated in the period was 81.2 ± 1.2. linear increasing effect of dietary digestible methionine + cystine levels on daily weight gain and linear decreasing effect on feed:gain ratio were observed. no effects of treatments on daily feed intake were observed. quadratic effect of treatments on fat deposition rate, that decreased by 0.508%, and increasing linear effect on protein deposition rate were observed. it was concluded that the dietary digestible sulphurous amino acids requirement for barrows on a high temperature environment from 15 to 30 kg is of 0.558% digestible methionine + cystine, that corresponds to 60% digestible methionine and cystine:digestible lysine ratio.
Níveis de proteína bruta e suplementa??o de aminoácidos em ra??es para leitoas mantidas em ambiente termoneutro dos 60 aos 100 kg
Orlando, Uislei Antonio Dias;Oliveira, Rita Flávia Miranda de;Donzele, Juarez Lopes;Ferreira, Rony Antonio;Silva, Francisco Carlos de Oliveira;Vaz, Roberta Gomes Maral Vieira;Siqueira, Jefferson Costa de;
Revista Brasileira de Zootecnia , 2006, DOI: 10.1590/S1516-35982006000200020
Abstract: a trial was conduced to evaluate decreasing levels of cp with amino acid supplementation on performance of gilts on thermoneutral environment. thirty-five crossbreed gilts (landrace x large white) averaging initial weight of 60.5 kg were allotted to a complete randomized design with five treatments (17.3, 16, 14.7, 13.4 and 12.1% of cp) of seven replications (one animal per experimental unit). the experimental diets were fed ad libitum until the end of the experiment when the animals reached the average weight of 100.6 kg. no effect of decreasing dietary levels of crude protein on performance (feed intake, weight gain and feed gain ratio) was observed. decreasing dietary cp levels did not affect the carcass characteristics (carcass length, loin eye area, backfat thickness and carcass, lean growth, fat and ham yield), but affected the relative and absolute weights of liver and the greatest value was observed in animals fed diet with 16.0% of cp. decreasing dietary cp levels from 17.3 to 12.1% for gilts from 60 to 100 kg on thermoneutral environment did not affect performance, since diets are supplemented with limiting essential amino acids.
Características agron micas, morfogênicas e estruturais do capim "Panicum maximum" cv. Momba a sob desfolha o intermitente Characteristics agronomic, morphogenic and structural of the “Panicum maximum” cv. Momba a grass under intermittent defoliation
Carlos Henrique Oliveira Macedo,Emerson Alexandrino,Adriano Jakelaitis,Roberta Gomes Maral Vieira Vaz
Revista Brasileira de Saúde e Produ??o Animal , 2010,
Abstract: Avaliou-se o efeito de dois períodos de descanso sobre as características morfogênicas, estruturais e o acúmulo de forragem do Panicum maximum cv. Momba a estabelecido na Amaz nia Legal. Os tratamentos foram dispostos em delineamento em blocos ao acaso, com quatro repeti es. Os períodos avaliados foram de 36 e 48 dias de rebrota o, com 25 cm de altura do corte. Para as características agron micas avaliadas, apenas a produ o de matéria seca de lamina foliar n o foi incrementada com o prolongamento do período de descanso. A produ o de matéria seca total n o variou entre os períodos de descanso, o que demonstra que, no menor período de descanso (36 dias), a menor produ o por corte foi compensada pelo maior número de cortes. O período de descanso n o influenciou sobre nenhuma variável morfogênica avaliada, com exce o para o filocrono, e a maior média obtida no menor período de descanso. Para as características estruturais do relvado, foi detectado efeito do período de descanso para o comprimento de lamina foliar, número de folhas mortas e rela o folha colmo. O prolongamento do período de descanso n o altera as características morfogênicas da forragem, n o obstante, altera a estrutura do pasto e aumenta a produ o de matéria seca total. The effect of rest periods during seasons was evaluated on morphogenetic and structural characteristics and herbage accumulation of Panicum maximum cv. Mombaca established in Amazonia. We used a completely randomized design, with four replicates per treatment. Rest periods were 36 and 48 days, and height of cut was 25 cm. Leaf blade dry matter production did not increase as rest period increased. Dry matter production did not modify between rest periods, showing that in the lowest rest period lower production was compensated by higher number of cuts. Rest period did not influence the morphogenetic variable evaluated, except phyllocrono as higher average was obtained in lower rest period. For structural characteristics, effect of rest period was observed for leaf blade length, death leaves number and leaf-stem ration.
Evolution of the biomass and the profile of organic reserves during regrowth of “Brachiaria brizantha” cv. Marandu submitted to levels of nitrogen Evolu o da biomassa e do perfil da reserva organica durante a rebrota o da "Brachiaria brizantha" cv. Marandu submetida a doses de nitrogênio
Emerson Alexandrino,Paulo Roberto Mosquim,Domício do Nascimento Júnior,Roberta Gomes Maral Vieira Vaz
Revista Brasileira de Saúde e Produ??o Animal , 2008,
Abstract: The regrowth of forage plants is supported by organic compounds synthesized by them. In this way, the objective was to evaluate the nitrogen (N) effect on dry biomass evolution and the profile of organics compounds on the botton of Brachiaria brizantha cv. Marandu represented by non structural carbohydrates and nitrogen compounds. Treatments were distributed in a randomized blocks design, under factorial scheme (3 x 6), with three levels of N (0, 20 e 40 mg /dm3 soil/week N) and six dates of regrowth (0, 2, 4, 8, 16 e 32 days after the uniformization cut) in a greenhouse with three repetitions for each treatment. N had positive effect (P<0.05) on the evolution of the biomass of the plants during the regrowth. Non structural carbohydrates content reduced after defoliation, which was stimulated by N levels. From the compounds that contributed to non structural carbohydrates, the reduced sugars were more sensible followed by starch and non reduced sugars which decreasing of 84, 40 and 14% respectively. N level increased the nitrogen compounds content and the highest reduction of the content after cut was showed by plants that did not received N. A rebrota o das forrageiras é mantida pelos compostos organicos sintetizados por elas. Dessa forma, objetivou-se avaliar o efeito do nitrogênio (N) sobre a evolu o da biomassa seca e do perfil dos compostos organicos da base do colmo da Brachiaria brizantha cv. Marandu, representados pelos carboidratos totais n o-estruturais e compostos nitrogenados. Foi utilizado o delineamento em blocos casualizados, em esquema fatorial 3 x 6, sendo três doses de N (0, 20 e 40 mg /dm3 de solo/semana de N) e seis tempos de rebrota o (0, 2, 4, 8, 16 e 32 dias após o corte de uniformiza o), em casa-de-vegeta o, com três repeti es para cada tratamento. O N teve efeito significativo (P<0,05) e positivo sobre a evolu o da biomassa das plantas durante a rebrota o. O conteúdo de carboidratos totais n o-estruturais reduziu após a desfolha o, sendo estimulado com o aumento das doses de N. Dos compostos que formam os carboidratos totais n o-estruturais, os a úcares redutores foram os mais sensíveis, seguidos do amido e a úcares n o-redutores, com redu o de 84, 40 e 14%, respectivamente. O N estimulou a recupera o dos a úcares redutores e incrementou a redu o do amido após a desfolha o. O aumento na dose de N incrementou o conteúdo dos compostos nitrogenados, e a maior redu o do conteúdo após o corte foi encontrada em plantas que n o receberam N.
Níveis de lisina digestível em ra??es para frangos de corte de 22 a 42 dias de idade, mantidos em ambiente de termoneutralidade
Lana, Sandra Roselí Valerio;Oliveira, Rita Flávia Miranda de;Donzele, Juarez Lopes;Gomes, Paulo Cézar;Vaz, Roberta Gomes Maral Vieira;Rezende, Wilkson de Oliveira;
Revista Brasileira de Zootecnia , 2005, DOI: 10.1590/S1516-35982005000500024
Abstract: two trials were conducted to evaluate the effects of increasing dietary digestible lysine levels, maintaining or not the amino acid relation, on performance of broilers from 22 to 42 days old on thermoneutral environment. two hundred and ten male broilers (averaging initial weight of 662.5 g) and 168 broilers (averaging initial weight of 623.7 g) were assigned to a completely randomized experimental design in trials 1 and 2, respectively. in trial 1, the broilers were allotted to five treatments (digestible lysine levels in conventional diets) and six replicates of seven broilers. in trial 2, the broilers were allotted to four treatments (digestible lysine levels in diet maintaining amino acid relation) and six replicates of seven broilers. in both trials, linear effect of digestible lysine levels on body weight gain and feed:gain ratio were observed. in trial 1, the increasing dietary digestible lysine levels increased linearly absolute carcass weight. there was no effect of lysine levels on relative carcass weights and on absolute and relative weichts of abdominal fat. in trial 2, absolute and relative breast and thigh weights increased linearly, while the absolute drumstick data increased quadraticly up to 0.955% digestible lysine level. no treatment effects on relative drumstick weight and absolute and relative weights of abdominal fat was observed. it was concluded that male broilers, avian farms, in the period from 22 to 42 days old, require at least 1.015 and 1.075% digestible lysine in conventional diet or in a diet maintaining the amino acid relation, respectively. this corresponds to an intake of 28 g digestible lysine for birds on a thermoneutral environment.
Níveis de metionina + cistina para pintos de corte mantidos em ambiente termoneutro
Oliveira Neto, Adhemar Rodrigues de;Oliveira, Rita Flávia Miranda de;Donzele, Juarez Lopes;Cecon, Paulo Roberto;Vaz, Roberta Gomes Maral Vieira;Gasparino, Eliane;
Revista Brasileira de Zootecnia , 2005, DOI: 10.1590/S1516-35982005000600020
Abstract: the experiment was conducted to determine the effect of dietary methionine + cystine (met + cys) requirement of 1-to-21-day-old broiler chicks on thermoneutral environment. four hundred avian farm male broiler chicks were assigned to a randomized experimental design with five treatments (0.756, 0.810, 0.866, 0.920, and 0.976% of met + cys), eight replicates of ten birds. weight gain (wg), feed:gain ratio, met + cys intake, protein deposition of absolute weights of liver, gizzard, and lung and relative weights of lung were affected by the increasing dietary met + cys levels. no effect of met + cys levels on feed intake, fat deposition, absolute weights of carcass, proventriculus, heart, and intestine or relative weights of heart, liver, gizzard, proventriculus, lung and intestines was verified. the best wg was observed at 0.866% met + total cys (0.790% met + digestible cys calculated) level, corresponding to 69% met + cys/total lys ratio (72% for digestible) and the best feed:gain ratio value was observed at 0.894% met + total cys (0.822% digestible calculated) level, corresponding to 72% met + cys/ digestible lys total ratio (74% met + cys/digestible lys ratio), for broiler chicks on thermoneutral environment.
Exigências de treonina digestível para leitoas mantidas em ambiente termoneutro dos 30 aos 60 kg
Saraiva, Edilson Paes;Oliveira, Rita Flávia Miranda de;Donzele, Juarez Lopes;Ferreira, Aloízio Soares;Vaz, Roberta Gomes Maral Vieira;Oliveira, Will Pereira de;
Revista Brasileira de Zootecnia , 2007, DOI: 10.1590/S1516-35982007000800020
Abstract: this study was carried out to evaluate the requirement of digestible threonine in diets of gilts from 30 to 60 kg, maintained thermoneutral environment. seventy crossbreed gilts with an initial weight of de 30.0 ± 0.61 kg were used in a randomized blocks design, with five treatments (levels of digestible threonine), seven replicates and two animals per experimental unity. the treatments corresponded of the levels of 0.50; 0.53; 0.56; 0.60; and 0.63% of digestible threonine. no effect was observed of digestible threonine level on daily weight gain of animals. feed:gain ratio improved in a quadratic way with the digestible threonine level, and the linear response plateau model estimated in 0.52% the level of amino acid, from which the feed conversion did not change. daily feed intake was reduced with the increase of digestible threonine intake. fat deposition linearly reduced, while protein deposition did not change with the increase of digestible threonine. the absolute and relative weight of kidneys and the absolute of intestine increased in a quadratic way with the digestible threonine levels, however, the relative weight of intestine increased in a linear way. it was concluded that the calculated level of 0.52% of digestible threonine, corresponding to a daily intake of 9.18 g and a relation with the digestible lysine of 63% provided better feed:gain ratio for gilts maintained in a thermoneutral environment from 30 to 60 kg.
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