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Search Results: 1 - 10 of 33413 matches for " Ricardo Andrade Reis "
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Impacts of limestone and nitrogen top dressing application on the potassium content in the soil profile and marandu-grass leaf concentration
Balieiro Neto, Geraldo;Reis, Ricardo Andrade;Ruggieri, Ana Cláudia;
Revista Brasileira de Zootecnia , 2009, DOI: 10.1590/S1516-35982009000700002
Abstract: the objective of this experiment was to evaluate the effects of nitrogen doses (0, 100, 200, 300, and 400 kg ha-1 year-1), with or without dolomitic lime covering application, on the potassium (k) soil content at depths varying form 0 to 5, 5 to 10, and 10 to 20 cm, and the potassium concentration in the plant. the experiment was carried out in a rhodic ferralsol with a slightly rolling relief, in a 5 × 2 factorial arrangement, in a complete randomized block design, with four replications. nitrogenated fertilization caused a linear increase in the potassium concentration in the plant and also in the mineral content in the 0-5 cm soil layer. an effect of competitive inhibition occurred between the potassium and calcium absorption, and potassium and magnesium absorption. although a significant fraction of potassium returned to the soil surface layer through the forage residue due to the increase in dry matter production caused by nitrogenated fertilization, the increase in the potassium concentration in the plant due to the doses of nitrogen demonstrated the importance of considering the potassium supply to the plant, when the forage mass is intensified through nitrogenated fertilization.
Chemical and microbiological changes and aerobic stability of marandu grass silages after silo opening
Bernardes, Thiago Fernandes;Reis, Ricardo Andrade;Amaral, Rafael Camargo do;
Revista Brasileira de Zootecnia , 2009, DOI: 10.1590/S1516-35982009000100001
Abstract: this trial had the objective of characterizing the microbial population and evaluating the aerobic stability of marandu grass silages with pelleted citrus pulp (pcp). the collected forage was submitted to the following treatments: silage of marandu grass; silage of marandu grass + 50 g/kg pcp and silage of marandu grass + 100 g/kg pcp on natural matter basis. metal cylindrical containers with 80 cm of height and 50 cm of diameter were used as silos during assays of microbiological dynamics and chemical changes of silages in anaerobiosis. evaluations were performed on days 0, 2, 4 and 6 after silos were opened. the aerobic stability was evaluated by change in temperature, using approximately three kilograms of silage inside styrofoam boxes that were placed inside a climatic chamber. a completely randomized experimental design and split plot arrangement were used in the two assays, with five replications. treatments were the plots and time was the subplots. bacillus and enterobacteria were present on the marandu grass silages with 0 g/kg pcp, which also showed ph increase throughout the feedout phase. yeast was detected on the silages that were added with pcp. a trend of increasing temperature with extension of the aeration time was observed mainly in the silages containing 100 g/kg pcp. isolated yeast strains showed lactate assimilation. silages were found to be unstable due to the silo opening, both by bacterial or yeast development, which reduced the nutritional value.
Fermentative and microbiological profile of marandu-grass ensiled with citrus pulp pellets
Bernardes, Thiago Fernandes;Reis, Ricardo Andrade;Moreira, Andréia Luciane;
Scientia Agricola , 2005, DOI: 10.1590/S0103-90162005000300003
Abstract: high-wet roughages with low content of soluble carbohydrates, such as tropical grasses, should be inappropriate for producing silages of adequate quality. this study aimed to evaluate the fermentative and microbiological profiles of marandu-grass ensilaged with pelleted citric pulp (pcp). brachiaria brizantha (hochst ex. a. rich) stapf cv. marandu with 58 days of vegetative growth was harvested for producing experimental silages in pvc silos provided with bünsen valves and density capacity of 900 kg m-3. treatments were three pcp levels (0, 50 and 100 g kg-1 of fresh forage) and seven times (1, 4, 7, 14, 21, 28 and 56 days) after sealing. pcp inclusion increased soluble carbohydrate concentrations by 15 to 20% and reduced ph (5.3 to 4.2) and n-nh3 levels of experimental silages. an increase of the population size of the enterobacterium (mean of 3 cfu g-1) was observed only at the first day of fermentation, small growth (mean 0.5 of cfu g-1) of clostridium and the dominance of homo in relation to hetero-fermentative bacteria. citric pulp addition during marandu-grass ensilage was benefic, its utilization being recommended, especially when associated with economical advantages.
Fermentative and microbiological profile of marandu-grass ensiled with citrus pulp pellets
Bernardes Thiago Fernandes,Reis Ricardo Andrade,Moreira Andréia Luciane
Scientia Agricola , 2005,
Abstract: High-wet roughages with low content of soluble carbohydrates, such as tropical grasses, should be inappropriate for producing silages of adequate quality. This study aimed to evaluate the fermentative and microbiological profiles of Marandu-grass ensilaged with pelleted citric pulp (PCP). Brachiaria brizantha (Hochst ex. A. Rich) Stapf cv. Marandu with 58 days of vegetative growth was harvested for producing experimental silages in PVC silos provided with Bünsen valves and density capacity of 900 kg m-3. Treatments were three PCP levels (0, 50 and 100 g kg-1 of fresh forage) and seven times (1, 4, 7, 14, 21, 28 and 56 days) after sealing. PCP inclusion increased soluble carbohydrate concentrations by 15 to 20% and reduced pH (5.3 to 4.2) and N-NH3 levels of experimental silages. An increase of the population size of the enterobacterium (mean of 3 CFU g-1) was observed only at the first day of fermentation, small growth (mean 0.5 of CFU g-1) of clostridium and the dominance of homo in relation to hetero-fermentative bacteria. Citric pulp addition during Marandu-grass ensilage was benefic, its utilization being recommended, especially when associated with economical advantages.
Desempenho de bovinos de corte mantidos em pastagem de capim-marandu submetidos a diferentes estratégias de suplementa??o no período das águas e da seca
Canesin, Roberta Carrilho;Berchielli, Telma Teresinha;Andrade, Pedro de;Reis, Ricardo Andrade;
Revista Brasileira de Zootecnia , 2007, DOI: 10.1590/S1516-35982007000200019
Abstract: the objective of this study was to evaluate weight gain of beef steers grazing brachiaria brizantha cv. marandu and receiving one out of three different supplementation strategies during the rainy season of 2003 and the dry and rainy seasons of 2004. twenty-four crossbreed steers averaging 230 kg of initial body weight were assigned to one of the following supplementation strategies: daily supplementation (ds), supplementation in alternated days (ad), or supplementation from monday to friday (mf) in a completely randomized design (8 replicates/treatment). animals were individually weighted with no fasting every 28 days. there were no differences in weight gain among the different supplementation strategies averaging 0.76, 0.74, and 0.71 kg/day during the rainy season of 2003; 0.61, 0.62, and 0.57 kg/day during the dry season of 2004; and 0.57, 0.54, and 0.51 kg/day during the rainy season of 2004, respectively, for ds, ad and mf treatments. it can be concluded that reducing supplementation frequency may decrease feeding and labor costs with no negative impact on animal performance.
Qualidade do Feno de Brachiaria decumbens Stapf. Submetido ao Tratamento com Am nia Anidra ou Uréia
Fernandes Leonardo de Oliveira,Reis Ricardo Andrade,Rodrigues Luis Roberto de Andrade,Ledic Ivan Luz
Revista Brasileira de Zootecnia , 2002,
Abstract: O experimento foi conduzido na fazenda Pedr es, no município de Uberaba-MG, para avaliar a qualidade do feno de Brachiaria decumbens enfardado após a queda de sementes. Os fenos foram submetidos aos seguintes tratamentos: feno n o tratado, feno tratado com am nia anidra (3,0% NH3 na MS), feno tratado com uréia (5,0% na MS). A composi o química, a digestibilidade dos fenos e o desempenho de novilhos foram avaliados usando um delineamento em blocos completos casualisados com três tratamentos e seis repeti es. A amoniza o utilizando NH3 ou uréia aumentou o conteúdo de proteína bruta e a DIVMS. O tratamento com NH3 reduziu os conteúdos de FDN e FDA, e a aplica o de uréia reduziu os conteúdos de hemicelulose e lignina. A amoniza o n o afetou os valores de nitrogênio insolúvel em detergente neutro e nitrogênio insolúvel em detergente ácido. Novilhos recebendo feno de brachiaria e farelo de soja (1,08 kg/dia de MS), feno tratado com am nia e milho gr o (1,14 kg/dia de MS) e feno tratado com uréia e milho gr o (1,14 kg/dia de MS) apresentaram consumo de MS de 1,97; 2,23 e 1,90% do peso vivo e ganhos de peso de 0,60; 0,53 e 0,37 kg/dia, e convers o alimentar 10,8; 12,8 e 16,9 kg MS/kg de ganho de peso, respectivamente.
Suplementa o de bovinos mantidos em pasto diferido de Brachiaria brizantha (cv. Marandu): parametros ruminais e degradabilidade = Supplementation of cattle kept in Brachiaria brizantha (cv. Marandu) pasture: ruminal parameters and degradability
Jo?o Ricardo Alves Pereira,Ricardo Andrade Reis,Telma Teresinha Berchielli,Liandra Maria Abaker Bertipaglia
Acta Scientiarum : Animal Sciences , 2008,
Abstract: O trabalho teve o objetivo de determinar o efeito de suplementos concentrados energético (milho) e proteico (glutenose e farelo de soja) com diferentes degradabilidades da proteína, fornecidos em dois níveis (0,5 e 1,5 kg animal-1 dia-1), sobre os parametrosruminais e degradabilidade dos nutrientes. Empregou-se o delineamento em blocos casualizados, em esquema de parcelas subdivididas, com três repeti es. A suplementa o n o afetou a degradabilidade potencial e efetiva, taxa de degrada o da MS e FDN da forragem. Em rela o à MS, o farelo de soja apresentou maior degradabilidade potencial queo milho e glutenose, e maior taxa de degrada o que a glutenose. Na fra o PB, menores degradabilidade potencial e efetiva foram verificadas na glutenose, e o farelo de soja apresentou maior taxa de degrada o que os demais. Os animais que receberam os diferentes suplementos n o diferiram da testemunha na concentra o de N-NH3 norúmen. No entanto, aqueles suplementados com farelo de soja apresentaram valores superiores, apresentando picos às 8 e 20h. Conclui-se que a suplementa o, nos níveis usados, n o proporcionou altera es na degradabilidade das fra es da forragem e, por outrolado, as fontes de proteína utilizadas distinguiram entre si na degradabilidade potencial e efetiva da MS e da PB dos suplementos. The trial was conduced with the objective of determining the effect of energy (corn) and protein (glutenose and soybean meal) supplements, with different protein degradability levels, supplied in two levels (0.5 and 1.5 kg animal-1 day-1), on ruminal parameters and nutrient degradability. A randomized blocks design in split-plot scheme was used, with three replications. Supplementation didnot affect potential and effective degradability and degradation rate of forage DM and NDF. Regarding DM, soybean meal presented higher potential degradability than corn and glutenose. Soybean meal supplementation produced a higher degradation rate compared tothe glutenose. However, on the CP fraction, the lowest potential and effective degradability were observed when the steers received glutenose. Soybean meal utilization resulted in highest protein degradation rate compared to the others. The steers controls and thosereceiving different supplementation showed similar ruminal N-NH3 values. However, the animals that received soybean meal showed higher N-NH3 values compared to the others, especially at 8am and 8pm. It is concluded that the supplementation, in the levels used, didnot affect forage fractions, and the protein source used was different on potential and effective
Composi??o química e digestibilidade de fenos tratados com am?nia anidra ou uréia
Reis, Ricardo Andrade;Rodrigues, Luis Roberto de Andrade;Pereira, Jo?o Ricardo Alves;Ruggieri, Ana Cláudia;
Revista Brasileira de Zootecnia , 2001, DOI: 10.1590/S1516-35982001000300009
Abstract: the experiment was conducted to evaluate the changes on the chemical composition and in vitro dry matter digestibility (ivdmd) of the brachiaria decumbens stapf, brachiaria brizantha (hochst ex. a. rich) stapf, jaragua (hyparrhenia rufa ness stapf) hays, harvested following the seed ripening stage and treated with anhydrous ammonia (3.0% dm) or urea (5.4% dm). the data showed that anhydrous ammonia and urea decreased ndf and hemicellulose contents with the same efficiency. the treatments did not change adf, cellulose, and lignin contents. it was observed an increase in the nitrogen as compounds, tn and adin due to the ammoniation. the adin/tn ratio was reduced due to the ammoniation. the ivdmd increased due to the changes observed in the chemical composition of the fiber, and the increase of the readily digestible nitrogen of the hays.
Avalia o de fontes de am nia para o tratamento de fenos de gramíneas tropicais. 1. Constituintes da parede celular, poder tamp o e atividade ureática
Reis Ricardo Andrade,Rodrigues Luis Roberto de Andrade,Resende Kléber Tomás de,Pereira Jo?o Ricardo Alves
Revista Brasileira de Zootecnia , 2001,
Abstract: Avaliaram-se as altera es da fra o fibrosa e as características químicas dos fenos de braquiária decumbens (Brachiaria decumbnes Stapf) e jaraguá (Hyparrhenia rufa Ness Stapf) n o-tratados, tratados com uréia (U-5,4% da MS), uréia (UL-5,4% da MS) mais labe-labe (Lablab purpureus L. Sweet, cv. Highworth-3,0% da MS) ou am nia anidra (NH3 -3,0% da MS). O tratamento químico com uréia ou NH3 aumentou o pH e a digestibilidade in vitro verdadeira dos fenos. A amoniza o n o alterou os teores de fibra em detergente ácido e celulose, mas diminuiu os de fibra em detergente neutro, hemicelulose e lignina. O uso do labe-labe como fonte adicional de urease n o aumentou a eficiência da uréia no tratamento dos volumosos. As avalia es do conteúdo de umidade, do poder tamp o e da atividade ureática s o técnicas que podem auxiliar na previs o das respostas dos volumosos à amoniza o com o uso de uréia.
Avalia o de fontes de am nia para o tratamento de fenos de gramíneas tropicais. 2. Compostos nitrogenados
Reis Ricardo Andrade,Rodrigues Luis Roberto de Andrade,Resende Kléber Tomás de,Pereira Jo?o Ricardo Alves
Revista Brasileira de Zootecnia , 2001,
Abstract: Este estudo foi desenvolvido para se avaliarem as altera es nos conteúdos de compostos nitrogenados dos fenos de braquiária decumbens (Brachiaria decumbnes Stapf) e jaraguá (Hyparrhenia rufa Ness Stapf) n o-tratados, tratados com uréia (U - 5,4% da MS), uréia (UL - 5,4% da MS) mais labe-labe (Lablab purpureus L. Sweet, cv. Highworth-3,0% da MS) ou am nia anidra (NH3 -3,0% da MS). A aplica o de am nia anidra ou de uréia aumentou os teores de N total, N insolúvel em detergente neutro, N insolúvel em detergente ácido, N n o-protéico e N amoniacal. A amoniza o diminuiu as rela es N insolúvel em detergente neutro/N total e N insolúvel em detergente ácido/N total e aumentou as rela es N n o-protéico/N total, N amoniacal/N total e os teores de PB. O N aplicado foi retido, principalmente, nas formas de NNP e N amoniacal.
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