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Search Results: 1 - 10 of 233449 matches for " Simas José Manuel Correia de "
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Adi??o de probiótico ao leite integral ou sucedaneo e desempenho de bezerros da ra?a holandesa
Meyer, Paula Marques;Pires, Alexandre Vaz;Bagaldo, Adriana Regina;Simas, José Manuel Correia de;Susin, Ivanete;
Scientia Agricola , 2001, DOI: 10.1590/S0103-90162001000200001
Abstract: the possibility of limiting antibiotics as growth stimulants for farm animals has produced a climate in which both consumers and manufacturers are looking for alternatives. probiotics are being considered to exercise this role, and for this reason, 79 newborn holstein calves were used to evaluate the effects of lactobacillus acidophilus, enterococcus faecium and saccharomyces cerevisiae additions to whole milk or milk replacer. calves were assigned at birth to a completely randomized design with a 3x2 factorial arrangement of treatments. factors were: 1- whole milk: milk replacer at 3 days of age: milk replacer at 15 days of age; 2- probiotic supplementation or not. animals remained on the trial until 15 days after weaning. probiotic supplementation to calves fed milk replacer at 3 days of age improved preweaning daily body gain (with probiotic=0.22 vs. without probiotic=0.16 kg day-1) and feed conversion (2.62 vs. 3.85), as well as, postweaning feed conversion (1.66 vs. 2.03). milk replacer fed calves had higher starter intake (milk replacer=0.22 vs. whole milk=0.19 kg day-1), but lower dry matter intake (0.61 vs. 0.67 kg day-1) and the lowest weight at weaning (49 vs. 59 kg). when milk replacer was started at 3 days, calves had higher starter intake (milk replacer at 3 days=0.25 vs. milk replacer at 15 days=0.20 kg day-1) and lower weight at weaning (47.3 vs. 51 kg) in relation to milk replacer starting at 15 days. age at weaning and mortality rate were not affected by the probiotic supplementation or liquid diet.
Adi o de probiótico ao leite integral ou sucedaneo e desempenho de bezerros da ra a holandesa
Meyer Paula Marques,Pires Alexandre Vaz,Bagaldo Adriana Regina,Simas José Manuel Correia de
Scientia Agricola , 2001,
Abstract: A possibilidade de proibi o do uso de antibióticos como promotores de crescimento para animais de produ o tem feito com que consumidores e produtores procurem por alternativas. Os probióticos têm se mostrado promissores em cumprir este papel e por esta raz o, setenta e nove bezerros da ra a Holandesa foram utilizados para avaliar a adi o de probiótico constituído por Lactobacillus acidophilus, Enterococcus faecium e Saccharomyces cerevisiae ao aleitamento. Os animais foram distribuídos em um delineamento inteiramente casualizado, com arranjo fatorial de tratamentos 3x2, correspondendo ao tipo de dieta líquida (leite integral, sucedaneo ao 3° dia ou sucedaneo ao 15° dia de idade, com adi o ou n o de probiótico). O período experimental foi do nascimento até 15 dias após a desmama. O fornecimento de probiótico a bezerros(as) aleitados(as) com sucedaneo a partir dos 3 dias de idade melhorou o ganho de peso (com probiótico=0,22 vs. sem probiótico=0,16 kg dia-1) e convers o alimentar (2,62 vs. 3,85) até a desmama, e convers o alimentar (1,66 vs. 2,03) pós-desmama. Os bezerros aleitados com sucedaneo consumiram mais concentrado em rela o aos que receberam leite integral (sucedaneo=0,22 vs. leite=0,19 kg dia-1), mas consumiram menos matéria seca total (0,61 vs. 0,67 kg dia-1) e apresentaram menor peso à desmama (49 vs. 59 kg). Quando o uso de sucedaneo foi iniciado aos 3 dias, os bezerros apresentaram maior consumo de concentrado (sucedaneo aos 3 dias=0,25 vs. sucedaneo aos 15 dias=0,20 kg dia-1) e menor peso à desmama (47,3 vs. 51 kg) em rela o aos bezerros aleitados com sucedaneo aos 15 dias.
Fontes de amido e proteína para vacas leiteiras em dietas à base de capim elefante
Lima Laísse Garcia de,Nussio Luiz Gustavo,Gon?alves José Renato Silva,Simas José Manuel Correia de
Scientia Agricola , 2002,
Abstract: A correta associa o de fontes concentradas de energia e/ou proteína ao volumoso da ra o de bovinos, poderá maximizar o desempenho dos animais, como efeito da complementariedade das taxas de degrada o de nutrientes. Avaliou-se o efeito de diferentes formas de processamento de milho, níveis de inclus o na dieta e fontes de proteína sobre a digestibilidade dos nutrientes na dieta, parametros de fermenta o ruminal, bem como o desempenho de vacas leiteiras. Foram utilizadas cinco vacas da ra a holandesa em lacta o, distribuídas ao acaso em um delineamento experimental do tipo quadrado latino 5 x 5. Os tratamentos utilizados foram: silagem de milho, farelo de soja e milho moído (quirera fino) em nível alto; capim elefante, farelo de soja, milho moído em nível alto; capim elefante, farelo de soja, milho moído em nível baixo; capim elefante, farelo de soja, milho floculado (360 g L-1) em nível alto; capim elefante, farinha de peixe, milho floculado em nível alto. A dieta contendo capim elefante, milho floculado e farelo de soja em alto nível foi a que mais se aproximou da dieta de silagem de milho nos diversos parametros avaliados. A fonte de proteína n o degradável no rúmen (PNDR) n o apresentou vantagens em rela o à fonte convencional de proteína. O fornecimento de baixo nível de concentrado n o supriu as deficiências energéticas do capim elefante. A maior eficiência de produ o de vacas leiteiras que receberam ra es com base em capim elefante simulando pastejo foi observada quando a energia estava disponível no rúmen, seja através do processamento, ou seja da maior inclus o de concentrado na dieta.
Efeito de fontes e formas de processamento do amido sobre o desempenho e o metabolismo do nitrogênio em vacas Holandesas em lacta??o
Pires, Alexandre Vaz;Susin, Ivanete;Santos, Flávio Augusto Portela;Mendes, Clayton Quirino;Oliveira Junior, Reinaldo Cunha de;Fernandes, Juliano José de Resende;Simas, José Manuel Correia de;
Revista Brasileira de Zootecnia , 2008, DOI: 10.1590/S1516-35982008000800017
Abstract: the objective of this trial was to evaluate the effect of starch sources and processing used in diets on performance and nitrogen metabolism of lactating holstein dairy cows fed sugar cane as forage. five multiparous lactating holstein cows, cannulated in the rumen and proximal duodenum, were used in a 5 × 5 latin square. cows were fed a 40:60 forage concentrate ration (40% fresh sugar cane and 60% concentrate) and differ only on processing or mainly starch source: cracked corn; finely ground corn; flaked corn at 310 g/l; flaked corn at 360 g/l or cassava scrapings. the in vitro starch hydrolysis rate of cassava scrapings was higher than others sources of starch in this trial. the flaked corn showed higher hydrolysis rate of starch than ground corn. average values for total percentage of hydrolyzed starch were 93.5, 85.6, 83.7 and 37.8% for the cassava scrapings, flaked corn at 310 g/l, flaked corn at 360 g/l and ground corn, respectively. there was no difference for dry matter intake, milk protein and fat contents, microbial synthesis and plasma glucose concentration. cassava scrapings decrease daily fat and protein productions and fat corrected milk production, with mean values of 0.40, 0.45 and 12.48 kg/day; 0.68, 0.64 and 19.74 kg/day; 0.57, 0.62 and 17.37 kg for cassava scrapings, flaked corn and ground corn, respectively. average values of ruminal ammonia were lower with flaked corn or cassava scrapings, showing more active fermentation of these starch sources. although of highest rate of starch hydrolysis, cassava scrapings altered protein metabolism with a reduction in microbial protein synthesis.
Fontes de amido e proteína para vacas leiteiras em dietas à base de capim elefante
Lima, Laísse Garcia de;Nussio, Luiz Gustavo;Gon?alves, José Renato Silva;Simas, José Manuel Correia de;Pires, Alexandre Vaz;Santos, Flávio Augusto Portela;
Scientia Agricola , 2002, DOI: 10.1590/S0103-90162002000100002
Abstract: ruminant performance may be improved due to association of specific energy and protein supplemental sources by matching nutrient degradation rates on diets. this work aimed to analyze the effects of corn grain processing, concentrate levels and protein sources on nutrient digestibilities, ruminal fermentation parameters, and performance of lactating holstein cows. treatments were: corn silage with high concentrate level containing soybean meal and finelly ground corn (fgc); green chopped elephant grass (ceg) with high concentrate level containing soybean meal and fcg; ceg with low concentrate level containing soybean meal and fcg; ceg with high concentrate level containing soybean meal and steam flaked corn (sfc) (360 g l-1) and ceg with high concentrate level containing fish meal and sfc. the trial was set up in a 5 x 5 latin square design. overall nutrient digestion, ruminal parameters and milk yield were improved with sfc plus soybean concentrate associated to elephant grass rations. performance of group fed ceg added with sfc and soybean meal was comparable to the group fed corn silage based ration. low concentrate ration level or the addition of fish meal did not improve ruminal fermentation, leading to reduced animal performance. in grazing trials with elephant grass, dairy cows present better efficiency when energy availability is enhanced at the ruminal level . the additional energy supply may be achieved by either increasing concentrate level or by altering ruminal starch degradability.
Substitui??o do gr?o de milho pelo milheto (Pennisetum americanum) na dieta de vacas holandesas em lacta??o
Ribeiro, Cláudio Vaz Di Mambro;Pires, Alexandre Vaz;Simas, José Manuel Correia de;Santos, Flávio Augusto Portela;Susin, Ivanete;Oliveira Junior, Reinaldo Cunha de;
Revista Brasileira de Zootecnia , 2004, DOI: 10.1590/S1516-35982004000500030
Abstract: animal production and and ruminal parameters were analyzed to evaluate the substitution of corn by pearl millet. four lactating cannulated holstein cows were used in a incomplete 5x4 latin square design. cows were fed a 48.6% corn silage diet (dry matter basis). treatments consisted of substitution of corn stacrh by pearl millet in five different proportions: 100:0, 75:25, 50:50, 25:75 and 0:100. all grain substitutions were estimated in the starch content basis. there was no effect of grain source on dry matter intake, milk yield and milk fat percent. however, there was a quartic effect on milk protein content, as pearl millet grain increased. there was no treatment effect on ruminal ph, acetate, propionate, butyrate and total volatile fatty acids concentration. there was a linear effect on ruminal n-nh3 concentration, when pearl millet was increased. pearl millet substitution for corn does not seem to affect performance of lactating holstein cows.
REPLACEMENT OF CORN SILAGE BY CHOPPED SUGARCANE PLUS WHOLE COTTONSEED ON RUMINAL PARAMETERS, MICROBIAL PROTEIN PRODUCTION, AND NUTRIENT DIGESTIBILITY IN LACTATING COWS SUBSTITUI O DE SILAGEM DE MILHO POR CANA-DE-A úCAR E CARO O DE ALGOD O NOS PAR METROS RUMINAIS, SíNTESE DE PROTEíNA MICROBIANA E UTILIZA O DOS NUTRIENTES EM VACAS LACTANTES
Alexandre Vaz Pires,Ivanete Susin,José Manuel Corrêa de Simas,Flávio Augusto Portela Santos
Ciência Animal Brasileira , 2008,
Abstract: Five multiparous Holstein cows averaging 525.91 kg BW and 85 days in milk were assigned in a 5 x 5 Latin square to evaluate the effects of corn silage replacement by sugarcane plus whole cottonseed. Cows were cannulated in the rumen and proximal duodenum and were fed a 50:50 concentrate:forage diet (DM basis). Treatments were defined by the replacement of corn silage by chopped sugarcane (whole plant) plus whole cottonseed in the following proportions: 100:0 (control); 75:25; 50:50; 25:75; 0:100 in the DM basis. Dry matter intake (DMI) of cows fed 100, 75, and 50% corn silage diets was higher (P<0.05) than DMI of cows fed 25 and 0% corn silage. Ruminal degradability and total tract digestibility of neutral detergent fiber and acid detergent fiber were not affected (P>0.05) by treatment diets. Total digestibilities of crude protein in diets containing up to 50% of sugarcane were lower than in diets containing 75 or 100% of sugarcane. Ruminal ammonia concentration decreased (P<0.05) with sugarcane and whole cottonseed inclusion. Concentrations of acetic, propionic and butyric acids as well as total volatile fatty acids concentration were higher (P<0.05) with sugarcane inclusion up to 50% level. Corn silage can be replaced by sugar cane plus whole cottonseed up to 50% level of forage in the diet without negative effect on nutrient utilization by dairy cows producing up to 18 kg milk/day. KEY WORDS: Digestibility, NDF, volatile fatty acid. Utilizaram-se cinco vacas holandesas pluríparas (525,91 kg PV e média de 85 dias de lacta o) distribuídas em delineamento quadrado latino 5 x 5 para avalia o da substitui o da silagem de milho por cana-de-a úcar. Os animais foram canulados no rúmen e duodeno proximal, sendo alimentados com ra es contendo 50% de concentrado e 50% de volumoso na base seca. Os tratamentos consistiram na substitui o gradativa da silagem de milho por cana-de-a úcar picada (planta inteira) mais caro o de algod o, nas seguintes propor es: 100:0 (controle); 75:25; 50:50; 25:75 e 0:100, com base na MS da ra o. O consumo de matéria seca das vacas alimentadas com as ra es 100%, 75% e 50% de silagem de milho foi maior (P<0,05) do que o das vacas alimentadas com 25% e 0% de silagem de milho. A degradabilidade ruminal e a digestibilidade total da fibra em detergente neutro e fibra em detergente ácido n o diferiram (P>0,05) entre os tratamentos. A digestibilidade total da proteína bruta das ra es em que houve substitui o de silagem de milho por cana-de-a úcar mais caro o de algod o até o teor de 50% foi menor do que a das ra es com 75% e 100%
SUBSTITUI O DE SILAGEM DE MILHO POR CANA-DE-A úCAR E CARO O DE ALGOD O SOBRE O DESEMPENHO DE VACAS HOLANDESAS EM LACTA O
Alexandre Vaz Pires,Ivanete Susin,José Manuel Corrêa de Simas,Reinaldo Cunha de Oliveira Júnior
Ciência Animal Brasileira , 2010,
Abstract: Five multiparous Holstein cows averaging 526 kg of body weight and 85 days of lactation were assigned in a 5 x 5 latin square design for the evaluation of the replacement of corn silage by sugar cane and whole cottonseed. Cows were fed a 50:50 concentrate:forage diet (dry matter basis-DM). Treatments were defined by the replacement of corn silage by chopped sugar cane (whole plant) according to the following proportions: 100:0 (control), 75:25, 50:50, 25:75, 0:100, based on dry matter roughage. In each treatment, 0, 5, 10, 15, and 20% of whole cottonseed were added to the dietary DM, respectively. Dry matter intake (DMI) of cows fed 100, 75, and 50% corn silage diets was higher (P < 0.05) than the DMI of cows fed 25 and 0% corn silage. Milk production was higher (P < 0.05) for cows fed 100, 75 and 50% corn silage than for cows fed 25 or 0% corn silage. Milk fat concentration was higher (P < 0.05) for cows fed 50, 25 or 0% corn silage than for cows fed 100 or 75% corn silage. Milk protein concentration was not affected (P > 0.05) by inclusion of sugar cane and whole cottonseed. Corn silage can be replaced by sugar cane up to 50% of roughage level without negative effect on performance of dairy cows producing up to 18 kg milk/day.
Influence of brain death and associated trauma on solid organ histological characteristics
Simas, Rafael;Kogiso, Diogo Haruo;Correia, Cristiano de Jesus;Silva, Luiz Fernando Ferraz da;Silva, Isaac Azevedo;Cruz, José Walber Miranda Costa;Sannomiya, Paulina;Moreira, Luiz Felipe Pinho;
Acta Cirurgica Brasileira , 2012, DOI: 10.1590/S0102-86502012000700006
Abstract: purpose: to evaluate histopathological alterations triggered by brain death and associated trauma on different solid organs in rats. methods: male wistar rats (n=37) were anesthetized with isoflurane, intubated and mechanically ventilated. a trepanation was performed and a balloon catheter inserted into intracraninal cavity and rapidly inflated with saline to induce brain death. after induction, rats were monitored for 30, 180, and 360 min for hemodynamic parameters and exsanguinated from abdominal aorta. heart, lung, liver, and kidney were removed and fixed in paraffin to evaluation of histological alterations (h&e). sham-operated rats were trepanned only and used as control group. results: brain dead rats showed a hemodynamic instability with hypertensive episode in the first minute after the induction followed by hypotension for approximately 1 h. histological analyses showed that brain death induces vascular congestion in heart (p<0.05), and lung (p<0.05); lung alveolar edema (p=0.001), kidney tubular edema (p<0.05); and leukocyte infiltration in liver (p<0.05). conclusions: brain death induces hemodynamic instability associated with vascular changes in solid organs and compromises most severely the lungs. however, brain death associated trauma triggers important pathophysiological alterations in these organs.
Paradoxical effects of brain death and associated trauma on rat mesenteric microcirculation: an intravital microscopic study
Simas, Rafael;Sannomiya, Paulina;Cruz, José Walber M. C;Correia, Cristiano de Jesus;Zanoni, Fernando Luiz;Kase, Maurício;Menegat, Laura;Silva, Isaac Azevedo;Moreira, Luiz Felipe P;
Clinics , 2012, DOI: 10.6061/clinics/2012(01)11
Abstract: objective: experimental findings support clinical evidence that brain death impairs the viability of organs for transplantation, triggering hemodynamic, hormonal, and inflammatory responses. however, several of these events could be consequences of brain death-associated trauma. this study investigated microcirculatory alterations and systemic inflammatory markers in brain-dead rats and the influence of the associated trauma. method: brain death was induced using intracranial balloon inflation; sham-operated rats were trepanned only. after 30 or 180 min, the mesenteric microcirculation was observed using intravital microscopy. the expression of pselectin and icam-1 on the endothelium was evaluated using immunohistochemistry. the serum cytokine, chemokine, and corticosterone levels were quantified using enzyme-linked immunosorbent assays. white blood cell counts were also determined. results: brain death resulted in a decrease in the mesenteric perfusion to 30%, a 2.6-fold increase in the expression of icam-1 and leukocyte migration at the mesentery, a 70% reduction in the serum corticosterone level and pronounced leukopenia. similar increases in the cytokine and chemokine levels were seen in the both the experimental and control animals. conclusion: the data presented in this study suggest that brain death itself induces hypoperfusion in the mesenteric microcirculation that is associated with a pronounced reduction in the endogenous corticosterone level, thereby leading to increased local inflammation and organ dysfunction. these events are paradoxically associated with induced leukopenia after brain damage
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