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| Registros recuperados: 11 | |
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| Valarini,Pedro José; Frighetto,Rosa Toyoko Shiraishi; Schiavinato,Ricardo José; Campanhola,Clayton; Sena,Marcelo Martins de; Balbinot,Leoberto; Poppi,Ronei Jesus. |
| A análise integrada de indicadores edafobiológicos ligados ao manejo do solo constitui uma ferramenta importante para estimar níveis de sustentabilidade do agroecossistema, detectando-se pontos críticos para a devida correção de manejo. Essa ferramenta foi empregada na avaliação de sistemas de produção orgânica e convencional de tomate, em cultivo protegido e a campo aberto, no estado de São Paulo. Tomaram-se como referência solos de mata nativa e/ou pastagem natural, dependendo do local de estudo. Em Serra Negra, o solo sob sistema orgânico apresentou maior capacidade de campo e teor de argila dispersa mais baixo, indicativos da estabilidade dos agregados. No sistema convencional observou-se uma elevada condutividade elétrica, evidenciando a alta... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Qualidade do solo; Análise de componentes principais; Sustentabilidade; Agroecossistema. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362007000100012 |
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| Possenti,Rosana Aparecida; Franzolin,Raul; Schammas,Eliana Aparecida; Demarchi,João José Assumpção de Abreu; Frighetto,Rosa Toyoko Shiraishi; Lima,Magda Aparecida de. |
| Este trabalho foi realizado com o objetivo de avaliar os efeitos do uso de leucena e levedura em dietas para bovinos sobre o metabolismo ruminal, incluindo o pH e as produções de ácido graxos voláteis (AGV), amônia e gás metano. Quatro bovinos machos com 800 kg e fistulados no rúmen foram mantidos em quadrado latino 4 × 4, em arranjo fatorial 2 × 2, composto de dois níveis de leucena (20 e 50% MS) e feno de capim coast-cross na presença ou ausência de levedura. Não houve influência das dietas nos valores médios de pH (média 6,82) e nas concentrações de amônia no rúmen, que variaram de 18 a 21 mg/100 mL. Houve interação entre níveis de leucena e levedura na concentração total de AGV. As dietas não diferiram quanto à concentração de ácido acético, mas os... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ácidos graxos voláteis; Gases ruminais; Levedura; Metabolismo ruminal. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982008000800025 |
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| Lima,Ana Rebeca Castro; Fernandes,Marcia Helena Machado da Rocha; Teixeira,Izabelle Auxiliadora Molina de Almeida; Frighetto,Rosa Toyoko Shiraishi; Bompadre,Thiago Francisco Ventoso; Biagioli,Bruno; Meister,Naomi Cristina; Resende,Kléber Tomás de. |
| ABSTRACT This study was carried out to to evaluate how feed restriction and different forage:concentrate ratios affect digestibility, methane emission (using the SF6 technique), and energy utilization of Anglo-Nubian goats. Fifteen (15) dry and non-pregnant Anglo Nubian goats, averaging 30±2.9 kg body weight, were used. The experiment was divided into two trials, the first of which was designed to study the effects of feed restriction (0% or ad libitum; 15% of feed restriction or equivalent to 85% of ad libitum intake; and 40% of feed restriction or equivalent to 60% of ad libitum intake) and the second, to study the effects of forage:concentrate (F:C) ratios (75:25, 54:46, and 25:75) in the diet. The sulfur hexafluoride (SF6) tracer gas method was used to... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Greenhouse gases; Ruminants; SF6. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982016001200781 |
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| Canesin,Roberta Carrilho; Berchielli,Telma Teresinha; Messana,Juliana Duarte; Baldi,Fernando; Pires,Alexandre Vaz; Frighetto,Rosa Toyoko Shiraishi; Fiorentini,Giovani; Reis,Ricardo Andrade. |
| The objective of this study was to evaluate the characteristics of ruminal fermentation and enteric methane production in beef cattle subjected to different supplementation frequencies while grazing on Brachiaria brizanthacv. Marandu pastures. Nine cattle (325±65.7 kg BW) fitted with ruminal and duodenal cannulas were used in the ruminal fermentation study, and 12 cattle (399±32.6 kg BW) were used in the enteric methane production study. The treatments included supplementation once daily, supplementation once daily except Saturdays and Sundays, or supplementation on alternate days. The supplementation was equivalent to 10 g kg−1 BW day−1 for all treatments. The design employed was completely randomized with three treatments and three replications. When all... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bacterial N synthesis; N-alkane; Nutrient intake; Ruminal methane; Tropical pasture; Volatile fatty acids. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982014001100590 |
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| Frota,Marcílio Nilton Lopes da; Carneiro,Maria Socorro de Souza; Pereira,Elzânia Sales; Berndt,Alexandre; Frighetto,Rosa Toyoko Shiraishi; Sakamoto,Leandro Sannomiya; Moreira Filho,Miguel Arcanjo; Cutrim Júnior,José Antônio Alves; Carvalho,Geraldo Magela Côrtes. |
| Abstract: The objective of this work was to evaluate the quality of pasture and enteric methane (CH4) emission of Curraleiro Pé-duro x Nellore cattle in a pasture of Megathyrsus maximus 'Mombaça', both in full sun and in a consortium with babassu palms (Attalea spp.) in the Amazonian biome. The experimental design was completely randomized, with six steers per system, and the evaluations were done during the dry period (2015) and rainy period (2016). In comparison to forage in the full sun system, forage in the silvopastoral system showed, in the dry period, higher levels of crude protein, ether extract, total digestible nutrient, and in vitro digestible organic matter, and lower levels of dry matter, neutral detergent fiber, and total carbohydrate (TCHO).... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: CH4; Curraleiro Pé-duro; Greenhouse gases; Livestock farming; Nellore. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017001101099 |
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| Primavesi,Odo; Frighetto,Rosa Toyoko Shiraishi; Pedreira,Márcio dos Santos; Lima,Magda Aparecida de; Berchielli,Telma Teresinha; Barbosa,Pedro Franklin. |
| O objetivo deste trabalho foi quantificar a taxa de emissão de metano (CH4) pela técnica do gás traçador, hexafluoreto de enxofre (SF6), em bovinos leiteiros a pasto em condições tropicais brasileiras. As medições foram realizadas na estação das chuvas, com adequada oferta de forragem, em animais da raça Holandesa e Mestiça Leiteira Brasileira em pastagem de capim-tobiatã (Panicum maximum Jacq. cv. Tobiatã) adubada, com vacas em lactação, vacas secas e novilhas, e em pastagem de capim-braquiária (Brachiaria decumbens Stapf.) não adubada com novilhas. As concentrações de CH4 e SF6 foram determinadas por cromatografia gasosa. A emissão de CH4 pelas vacas em lactação foi de 13,8 a 16,8 g/hora, pelas vacas secas de 11,6 a 12,3 g/hora, pelas novilhas em... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Traçador interno; Hexafluoreto de enxofre; Metano ruminal; Gás de efeito estufa. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2004000300011 |
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| Lima,Magda Aparecida de; Vieira,Rosana Faria; Frighetto,Rosa Toyoko Shiraishi; Luiz,Alfredo José Barreto; Villela,Omar Vieira. |
| ABSTRACT: Local greenhouse gas flow measurement studies have been encouraged at a global level as a subsidy for national and state inventories. This study aimed to evaluate the seasonal methane emission during the 2008/2009 harvest, from an irrigated rice plantation, under pre-germinated system, in the municipality of Tremembé, State of São Paulo, using the static chamber technique and gas chromatography. The study showed high seasonal emission of methane (CH4) for the studied area, probably due to the long flooding period. It was estimated the CH4 emission factor (6.51 kg CH4 ha-1 dia-1), the partial global warming potential (pGWP, 27.2 Mg CO2eq growing season-1 ha-1) and the yield-scaled pGWP (YpGWP, 3.9 kg CO2eq kg-1 grain). |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Flooded rice; Pre-germinated system; Methane. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019001100201 |
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| Pedreira,Márcio dos Santos; Oliveira,Simone Gisele de; Primavesi,Odo; Lima,Magda Aparecida de; Frighetto,Rosa Toyoko Shiraishi; Berchielli,Telma Teresinha. |
| Using sorghum silage, the effect of roughage/concentrate ratios was evaluated on nutrient intake, digestibility, ruminal parameters and methane production by beef cattle. Three treatments (0, 30 and 60% of concentrate in DM of the diet) were distributed in three Latin squares, with nine animals and three periods. Dry matter intake increased as the grain concentration in diet increased; pH showed opposite behavior. Methane emissions were lower for animals fed the diet exclusively with sorghum silage as compared with those fed 30% of concentrate, but was similar to that of animals receiving 60% of concentrate. Losses of ingested gross energy as methane were reduced by 33% when grain concentration was increased in the diet. Concentrations of propionic and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Global greenhouse gases; Nutritional value; Rumen fermentation; SF6. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013000800009 |
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| Carvalho,Isabela Pena Carvalho de; Fiorentini,Giovani; Berndt,Alexandre; Castagnino,Pablo de Souza; Messana,Juliana Duarte; Frighetto,Rosa Toyoko Shiraishi; Reis,Ricardo Andrade; Berchielli,Telma Teresinha. |
| ABSTRACT The objective of this study was to evaluate the effect of lipid sources on voluntary intake, digestibility, performance, and CH4 emission of Nellore steers grazing Brachiaria brizantha cv. Xaraés forage in the dry season. Forty-five Nellore steers with average weight of 442±34 kg were alloted into one of the five treatments: without additional fat; with palm oil; with linseed oil; with protected fat; and with whole soybeans. The supplements were provided daily and quantities were adjusted to 1% of body weight and diets were formulated in accordance with the Cornell Net Carbohydrate and Protein System. The experimental design was completely randomized with five treatments and two replications. There were no effects on dry matter, organic matter,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Linseed oil; Palm oil; Protected fat; Supplementation; Whole soybeans. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982016001200760 |
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| Mercadante,Maria Eugênia Zerlotti; Caliman,Ana Paula de Melo; Canesin,Roberta Carrilho; Bonilha,Sarah Figueiredo Martins; Berndt,Alexandre; Frighetto,Rosa Toyoko Shiraishi; Magnani,Elaine; Branco,Renata Helena. |
| Feed intake and average daily gain (ADG) in Nellore cattle were determined to calculate residual feed intake in two performance tests: first during the growth phase (RFIgrowth) and then during a measurement of the methane emission phase (RFImet). During the RFIgrowth test, 62 males and 56 females were classified as low-, medium-, and high-RFI. Enteric methane emission was measured in 46 animals; 23 males used for RFImet measurement plus 23 females (22 low-RFIgrowth and 24 high-RFIgrowth). Diet consisted of Brachiaria brizantha cv. Marandu hay (445 g/kg DM) and concentrate (555 g/kg DM). During the RFIgrowth and RFImet phases, DMI was lower in the animals with low RFI, with no difference in ADG. Residual feed intake was -0.359 and 0.367 kg DM/d for low- and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Beef cattle; Enteric methane production; Feed efficiency; Performance; Sulfur hexafluoride. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982015000700255 |
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| Costa,Falberni de Souza; Bayer,Cimélio; Lima,Magda Aparecida de; Frighetto,Rosa Toyoko Shiraishi; Macedo,Vera Regina Mussoi; Marcolin,Elio. |
| O metano (CH4 ) apresenta um potencial de aquecimento 23 a 32 vezes maior do que o dióxido de C e a sua emissão diária em lavouras de arroz varia com a temperatura do solo e da água, e o metabolismo das plantas. O objetivo deste estudo foi determinar o horário apropriado à coleta de amostras de ar para quantificar a emissão média diária de CH4, informação fundamental para estudos visando a derivação de índices regionais de emissão desse gás. Três campanhas de monitoramento da emissão de CH4, com coletas em intervalos de 3h, foram realizadas nos estágios de emissão da panícula (campanha 1) e de maturação de grãos (campanhas 2 e 3) do arroz sob diferentes sistemas de cultivo (convencional e plantio direto) na safra 2002/2003, na Estação Experimental do... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sistemas de cultivo; Energia de ativação; Metanogênese. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782008000700041 |
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| Registros recuperados: 11 | |
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