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| Registros recuperados: 174 | |
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| Molina Benavides,Raúl Andrés; Sánchez Guerrero,Hugo; Atzori,Alberto Stanislao. |
| Abstract Thermal environment is recognized to be one the most important ecological factor to determine domestic animal growth, development and productivity for direct and indirect effects on its physiology and behavior. Despite having specific and individual adaptation, is very common, within seasonal or diurnal temperature variations, animals deal with situations outside their thermal comfort zone. Due to heat stress, dairy cows reduce milk production and fertility, and therefore, had achieved an increasing in metabolic disorders incidence, causing low revenues to farm in short and medium periods. Due to world climate change more impact of the meteorological variables on animal responses is expected for the future. This study aimed to describe and... |
| Tipo: Journal article |
Palavras-chave: Climate change; Grazing; Livestock production systems; Milk production; System dynamics; Temperature. |
| Ano: 2018 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122018000100059 |
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| Gul,B; Islam,M; Ahmad,S; Gul,S. |
| Spatial and temporal patterns of aboveground biomass and nutritive value of rangeland species with respect to the influence of grazing and soil moisture were investigated. The research was conducted during two years at the Tomagh Research Station, near Sanjawi, Ziarat District, Balochistan, Pakistan. This area is protected from grazing since 1998; however, some of the area is open for grazing. Tree sites were selected for research purposes: a protected plain, a protected hilly, and an unprotected plain grazed area. Sampling was carried out during the spring, summer and autumn seasons. Results revealed that soil moisture was greater at the protected than unprotected sites. The aboveground plant biomass was 66% to 76% lower at unprotected than protected... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Rangeland; Biomass production; Season; Semiarid; Grazing; Grass. |
| Ano: 2016 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572016000100013 |
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| FAGUNDES, J.L.; FONSECA, D.M. da; GOMIDE, J.A.; NASCIMENTO JUNIOR, D. do; VITOR, C.M.T.; MORAIS, R.V. de; MISTURA, C.; REIS, G. da C.; MARTUSCELLO, J.A.. |
| A dinâmica de crescimento de plantas forrageiras tem sido foco de estudo nos últimos anos, visando aprimorar o conhecimento do processo de produção de forragem em pastagens. O objetivo deste trabalho foi avaliar o acúmulo de forragem em pastos de Brachiaria decumbens Stapf. adubados com nitrogênio e submetidos a uma mesma intensidade de pastejo. Os tratamentos consistiram de 75, 150, 225 e 300 kg ha-1 ano-1 de N, aplicados antes do início das avaliações experimentais, as quais foram realizadas durante as estações de verão, outono, inverno e primavera de 2002. O delineamento experimental utilizado foi o de blocos completos casualizados com duas repetições. O capim-braquiária apresentou incremento de produção de matéria seca proporcional às doses de... |
| Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Adubação nitrogenada; Capim-braquiária; Eficiência de utilização de nitrogênio; Forragem; Pastejo; Nitrogen fertilization; Brachiaria grass; Nitrogen use efficiency; Forage; Grazing. |
| Ano: 2005 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/113974 |
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| Chretiennot-dinet, Marie-josèphe; Vaulot, Daniel; Galois, Robert; Spano, Anna-maria; Robert, Rene. |
| The ingestion of 8 algal species by oyster larvae (Crassostrea gigas Thunberg, 1793) was measured by flow cytometry (FCM). In a preliminary experiment, cell size (estimated by light scatter) and chlorophyll fluorescence of 30 algal species were evaluated to select those species which could be mixed together and still be easily discriminated by FCM. Grazing experiments were carried out over 48 h with 6 and 15-day old larvae fed on 3 algal mixtures, each containing 3 different algal species. The concentration of each species was estimated at 0, 6, 12, 24 and 48 h by FCM. Grazing pressure on a given algal species was dependent upon the age of the larvae, the time of the day and the composition of the mixture. Grazing rates of older larvae were about twice... |
| Tipo: Text |
Palavras-chave: Oyster larvae; Crassostrea gigas; Grazing; Algae; Selective feeding; Flow cytometry. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/00090/20164/17817.pdf |
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| THIAGO, L. R. L. de S.; SILVA, J. M. da.. |
| Para ser competitiva, a bovinocultura de conta tropical precisa explorar melhor o pasto, corrigindo suas possíveis deficiências nutricionais com um suplemento, o que deve ser feito com muito critério e dentro de uma meta de produção bem estabelecida. Isto porque nos trópicos, ao contrário dos países de clima temperado, é possível manter os bovinos em pastejo durante todo o ano , maximizando o conceito de "boi fotossintético". Os elementos que compõem esse sistema são a energia solar (luz e calor), a planta forrageira, componente sinstetizados das substâncias orgânicas (via fotossíntese), os bovinos, componente transformador da matéria vegetal em carne (via fermentação ruminal), o solo, componente sustentador e fornecedor de elementos nutritivos, a umidade,... |
| Tipo: Comunicado Técnico (INFOTECA-E) |
Palavras-chave: Bovino de corte; Nutrição animal; Suplementação em pasto; Suplemento mineral; Pastejo; Beef cattle; Animal nutrition; Supplements; Mineral nutrients; Grazing. |
| Ano: 2004 |
URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/326137 |
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| Pascal, P.y.; Dupuy, C; Mallet, C; Richard, P; Niquil, N. |
| The fate of benthic bacterial biomass in benthic food webs is a topic of major importance but poorly described. This paper describes an alternative method for evaluation of bacterial grazing rate by meiofauna and macrofauna using bacteria pre-enriched with stable isotopes. Natural bacteria from the sediment of an intertidal mudflat were cultured in a liquid medium enriched with 15NH4Cl. Cultured bacteria contained 2.9% of 15N and were enriched sufficiently to be used as tracers during grazing experiments. Cultured bacteria presented a biovolume (0.21 μm3) and a percentage of actively respiring bacteria (10%) similar to those found in natural communities. The number of Operational Taxon Units found in cultures fluctuated between 56 and 75% of that... |
| Tipo: Text |
Palavras-chave: Tracer; Stable isotope; Sediment; Grazing; Bacteria. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-4296.pdf |
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| Pascal, P.y.; Dupuy, C; Richard, P; Niquil, N. |
| The majority of sediment dweller foraminifera are deposit feeders. They use their pseudopodia to gather sediment with associated algae, organic detritus and bacteria. Uptake of bacteria by foraminifera have been observed but rarely quantified. We measured uptake of bacteria by the common foraminifera Ammonia tepida using 15N pre-enriched bacteria as tracers. In intertidal flats, seasonal, tidal and circadian cycles induce strong variations in environmental parameters. Grazing experiments were performed in order to measure effects of abiotic (temperature, salinity and irradiance) and biotic (bacterial and algal abundances) factors on uptake rates of bacteria. In mean conditions, A. tepida grazed 78 pgC ind-1 h-1 during the first eight hours of incubation,... |
| Tipo: Text |
Palavras-chave: Trophoecology; Prey abundance; Mudflat; Grazing; Foraminifera; Environmental factor; Bacteria. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-4298.pdf |
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| Pascal, P.y.; Dupuy, C; Richard, P; Rzeznik-orignac, J; Niquil, Nathalie. |
| The fate of the benthic bacterial biomass is a topic of major importance in understanding how softbottom environments function. Because of their high abundance, production and nutritional value, benthic bacteria may constitute an important food resource for benthic fauna. The trophic role of bacteria for a nematode community on the Brouage mudflat (Marennes-Ole´ron-France), dominated by three species: Chromadora macrolaima (64% of the abundance), Daptonema oxycerca (15%) and Ptycholaimellus jacobi (8%), was determined in grazing experiments using 15N pre-enriched bacteria. On intertidal flats, seasonal, tidal and circadian cycles induce strong variations in environmental conditions. Grazing experiments were performed in order to measure the effects of... |
| Tipo: Text |
Palavras-chave: Mudflat; Environmental factor; Grazing; Bacteria; Nematode. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-4295.pdf |
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| LOPES, M. N.; CÂNDIDO, M. J. D.; POMPEU, R. C. F. F.; SILVA, R. G. da; CARVALHO, T. C. F. de; SOMBRA, W. A.; MORAIS NETO, L. B. de; PEIXOTO, M. J. A.. |
| Abstract: This study evaluated the biomass flow of massai grass in regrowth subjected to different nitrogen levels (control - no fertilization; 400; 800; and 1200 N kg ha-1year-1) and under rotational stocking with sheep, in a completely randomized design with repeated measures over time. The leaf elongation rate increased with increasing nitrogen levels (N) and the fourth grazing cycle presented a lower value compared with the others. The stem elongation rate responded linearly with increasing levels of N, but it was not influenced by grazing cycles. The senescence rate of leaves remaining before grazing and after grazing were not influenced by the nitrogen fertilization or amended with successive grazing cycles. The phyllochron was influenced only by the... |
| Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Panicum infestum; Fluxo de biomassa; Capim massai; Nitrogen fertilization; Ovino; Fixação de nitrogênio; Morfogênese; Panicum maximum; Pastejo; Fertilizante nitrogenado; Sheep; Morphogenesis; Grazing. |
| Ano: 2013 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/955879 |
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| CUTRIM JÚNIOR, J. A. A.; CAVALCANTE, A. C. R.; CÂNDIDO, M. J. D.; SILVA, G. L.; OLIVEIRA, L. E. V.; VASCONCELOS, E. C. G.; MESQUITA, T. M. O.. |
| Biomass flow characteristics and forage accumulation were evaluated in Bermudagrass (Tifton 85) pasture managed under intermittent stocking with different management strategies. The management levels utilized were conventional (10 cm residual height and unfertilized), light (20 cm residual height and unfertilized), moderate (20 cm residual height with fertilization of 300 kg N/ha.year) and intensive (10 cm residual height with fertilization of 600 kg N/ha.year). A randomized design was used with repeated measurements over time, in two periods of the year, with four replicates. There was significant effect of management × period of the year on the leaf elongation rate (LER). The management levels under fertilization (0.59 and 0.60 cm/tiller.day for the... |
| Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Panicum infestum; Nitrogen fertilizers; Acúmulo de forragem; Adubação nitrogenada; Fluxo de biomassa; Biomass; Capim massai; Capim-tifton 85; Cynodon spp; Morfogênese; Fertilizante nitrogenado; Pastejo rotativo; Caprino; Cabra leiteira; Morphogenesis; Grazing; Goats; Grassland management; Rotational grazing. |
| Ano: 2013 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/956441 |
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| Registros recuperados: 174 | |
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