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Registros recuperados: 136
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Aboveground biomass and concentration of nutrients in semiarid rangeland plant species: Influence of grazing and soil moisture 85
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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Agriculture and livestock impacts on river floodplain wetlands: a study case from the lower Uruguay river 51
Bena,María Julia; Sirolli,Horacio; Kalesnik,Fabio.
Even though wetlands are very valuable environments, they suffer heavy exploitation and transformation processes that affect their biodiversity. The main goal of this study was to characterize the herbaceous plant communities associated with the southern Uruguay River flood plain. We focused on lowlands of two farms, one of which is surrounded by an embankment to prevent flooding. A random stratified sampling was performed in 72 plots. To detect distribution patterns and plant species associations we performed a Detrended Correspondence Analysis (DCA) and a Two-Way indicator species analysis (TWINSPAN). We could identify six groups of plots whose ordination patterns are related to the flooding preferences of dominant species. Herbaceous plant groups that...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Uruguay river; Dyking; Grazing; Herbaceous communities; Floodable lowlands.
Ano: 2016 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-23722016000200010
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Analysis of larval oyster grazing by flow cytometry 5
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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Aspectos práticos para suplementação de bovinos em pastejo. 14
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: Folhetos Palavras-chave: Bovino de corte; Suplementação em pasto; Supplements; Mineral nutrients; Pastejo; Nutrição Animal; Suplemento Mineral; Animal nutrition; Grazing; Beef cattle.
Ano: 2004 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/326137
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Avaliação de cinco gramíneas tropicais em solo de cerrado, sob condições de pastejo. 14
NUNES, S. G.; VIEIRA, J. M.; SOUZA, J. M. de.
Este trabalho foi desenvolvido e teve como objetivo investigar o comportamento de diferentes gramíneas forrageiras, implantadas em solos de cerrado, através do desempenho de novilhos.
Tipo: Folhetos Palavras-chave: Avaliação; Capim Kazungula; Condição; Evaluation; Forrageira; Gramineas; Gramíneas tropicais; Pasture; Plantas gramíneas forrageiras-Avaliação-Cerrados; Regiao tropical; Savanna; Tropical grassland; Bovino; Brachiaria Decumbens; Cerrado; Capim Pangola; Capim Jaraguá; Capim Colonião; Digitaria Decumbens; Hyparrhenia Rufa; Gramínea Tropical; Gramínea; Melhoramento; Pastagem; Pastejo; Nutrição Animal; Panicum Maximum; Produção; Solo; Setaria Anceps; Forage; Grazing; Grasses; Soil.
Ano: 1979 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1036161
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Avaliacao de gramineas e leguminosas forrageiras sob pastejo em duas regioes fisiograficas do Estado de Minas Gerais. 14
BOTREL, M. de A.; NOVELLY, P. E..
Tipo: Folhetos Palavras-chave: Planta graminea; Avaliacao; Minas Gerais; Grass; Leguminosa; Pastejo; Brazil; Grazing.
Ano: 1985 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/581768
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Bacterivory by benthic organisms in sediment : Quantification using 15N-enriched bacteria 5
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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Bacterivory in the common foraminifer Ammonia tepida: Isotope tracer experiment and the controlling factors 5
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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Bacterivory of a mudflat nematode community under different environmental conditions 5
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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Behavior of grazing European wild boar (Sus scrofa) in a semi-extensive production system 118
Hodgkinson,Suzanne M; Matus,Felipe; Lopez,Ignacio F.
In the semi-extensive farming systems that are used to raise European wild boar in countries such as Chile, the behavior of the animals in paddocks has not been studied and is important for managing the system. The objective of the present study was to determine the proportion of time that grazing wild boar spent on different activities and the distribution of these activities during the day. The study was conducted in paddocks containing Cynodon dactylon, Lolium perenne and Poa pratensis. A total of 35 purebred European wild boars with a liveweight (average + SEM) of 37.4 + 1.11 kg with noserings were used in the study. The animals were in the paddocks from 08:30 h until 16:30 h, after which they had free access to a commercial diet for one hour and were...
Tipo: Journal article Palavras-chave: Behavior observations; Behavior patterns; European wild boar; Grazing.
Ano: 2013 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202013000100017
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Behavior pattern of beef heifers supplemented with different energy sources on oat and ryegrass pasture 96
Pizzuti,Luiz Angelo Damian; Alves Filho,Dari Celestino; Brondani,Ivan Luiz; Pacheco,Paulo Santana; Freitas,Leandro da Silva; Segabinazzi,Luciane Rumpel; Callegaro,Álisson Marian; Teixeira,Odilene de Souza.
The objective of this study was to evaluate behavior patterns of heifers grazing on black oat (Avena strigosa Schreb.) and ryegrass (Lolium multiflorum Lam.), fed supplementation with brown rice meal and/or protected fat. A total of 28 Charolais × Nellore crossbred heifers at average initial age of 18 months and with initial live weight of 274.9±4.97 kg were used in the experiment. Animals were kept in oat + ryegrass pastures and distributed in the following treatments: no supplementation; Megalac (MEG): protected fat supplementation; supplementation with brown rice meal (BRM); and supplementation with BRM + MEG. The neutral detergent fiber (NDF) intake of pasture either in kg or in percentage of live weight was not changed by supply of supplement, but...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Feeding stations; Grazing; Idle; Neutral detergent fiber; Number of bites; Rumination.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000800017
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Behavioral aspects of Santa Inês sheep kept in pasture in a tropical rainforest climate 65
Manno,Maria Cristina; Rodrigues,Luiz Fernando de Souza; Lima,Kedson Raul de Souza; Carvalhal,Monique Valéria de Lima; Rodrigues Filho,Silas Santiago; Costa,Gleyce Lopes da; Monteiro,Ailime Nayara Gomes; Barreto,Andrea do Nascimento.
ABSTRACT: This study aimed to evaluate behavioral aspects of Santa Inês sheep in pasture in humid tropical climate. In order to do so, nine Santa Inês sheep were kept on pasture, exposed to the climate directly, without shade, for 24 days, with 12 alternate days in each period (dry and raining) in 2015. The behavioral parameters evaluated were: food consumption, standing idleness, lying idle and rumination. Observations occurred from 08:00 A.M. to 05:55 P.M. The experimental was a completely randomized design (CRD) with two treatments (rainy season and dry period), nine replications, one animal per experimental unit. To understand the correlations of the behavioral parameters with the climatic variables, Pearson’s correlation was performed. Approximate...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Dry season; Raining season; Grazing.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019000100651
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Bloques multinutricionales con follaje de árboles como suplemento alimenticio de ovinos. 32
Martínez Martínez, Ricardo.
Se evaluó la factibilidad técnica y financiera de incorporar follaje de árboles forrajeros en bloques multinutricionales (BMN) para suplementar ovinos en pastoreo. Se elaboraron bloques de 2.5 kg con follaje de Guazuma ulmifolia Lam., Leucaena lanceolata S. Watson, Acacia cochliacantha Humb. & Bonpl. Willd y Brosimum alicastrum Swartz, que se ofrecieron como suplemento a ovinos pelibuey durante el pastoreo. Se evaluó el costo de la manufactura y las características físico-químicas de los BMN, así como la preferencia, el consumo y la ganancia de peso de los animales durante la suplementación. Los bloques alcanzaron 4 kg cm-2 de dureza a los 7 días de su elaboración y contenían en promedio 23.5 % PC, 25 % FDN, 17.5 % FAD y más de 63 % DIVMS, con costo de...
Palavras-chave: Bloques multinutricionales; Suplementación; Arboles forrajeros; Ovinos; Pastoreo; Feed block; Supplementation; Fodder trees; Sheep; Grazing; Maestría; Agroecosistemas Tropicales.
Ano: 2010 URL: http://hdl.handle.net/10521/212
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Bloques multinutricionales con follaje de árboles como suplemento alimenticio de ovinos. 32
Martínez Martínez, Ricardo.
Se evaluó la factibilidad técnica y financiera de incorporar follaje de árboles forrajeros en bloques multinutricionales (BMN) para suplementar ovinos en pastoreo. Se elaboraron bloques de 2.5 kg con follaje de Guazuma ulmifolia Lam., Leucaena lanceolata S. Watson, Acacia cochliacantha Humb. & Bonpl. Willd y Brosimum alicastrum Swartz, que se ofrecieron como suplemento a ovinos pelibuey durante el pastoreo. Se evaluó el costo de la manufactura y las características físico-químicas de los BMN, así como la preferencia, el consumo y la ganancia de peso de los animales durante la suplementación. Los bloques alcanzaron 4 kg cm-2 de dureza a los 7 días de su elaboración y contenían en promedio 23.5 % PC, 25 % FDN, 17.5 % FAD y más de 63 % DIVMS, con costo de...
Palavras-chave: Bloques multinutricionales; Suplementación; Arboles forrajeros; Ovinos; Pastoreo; Feed block; Supplementation; Fodder trees; Sheep; Grazing; Maestría; Agroecosistemas Tropicales.
Ano: 2010 URL: http://hdl.handle.net/10521/212
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Body composition and deposition efficiency of protein and energy in grazing young bulls 2
Valente, Eriton Egidio Lisboa; Universidade Estadual do Oeste do Paraná; Paulino, Mário Fonseca; Universidade Federal de Viçosa; Marcondes, Marcos Inácio; Universidade Federal de Viçosa; Dias, Isabela Fernanda Teixeira; Universidade Federal de Viçosa.
The effects of supplementation with different protein: carbohydrate ratios on body composition, carcass characteristics and protein and energy deposition efficiency of young were assessed. Twenty-four Nellorecalves (132.5 ± 5.5 kgand 90-150 days of age) were kept on pasture for a 430 day experimental period. The treatments were: Control = mineral mixture only; HPHC = high-protein and high-carbohydrate supplement; HPLC = high-protein and low-carbohydrate supplement; LPHC = low-protein and high-carbohydrate supplement; LPLC = low-protein and low-carbohydrate supplement. Four animals at begning and 20 animal at end of experiment were slaughtered to evaluate the carcass composition. Control bulls had the lowest (p < 0.05) intake of ME (9.8 Mcal day-1)...
Tipo: Info:eu-repo/semantics/article Palavras-chave: 5.04.03.00-1 associative effects; Beef cattle; Calf; Grazing; Multiple supplement; Production.
Ano: 2014 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/21345
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BRS Mandobi amendoim forrageiro: leguminosa forrageira para intensificação sustentável da pecuária a pasto. 14
BRS Mandobi é uma cultivar de amendoim forrageiro (Arachis pintoi) propagada por sementes. É uma leguminosa forrageira herbácea, perene e estolonífera. Possui de 20 cm a 35 cm de altura, apresenta excelente capacidade de consorciação com gramíneas, elevado vigor e alta produtividade de matéria seca. É bem consumida pelo gado, melhorando a qualidade da dieta animal, devido ao seu elevado teor de proteína e alta digestibilidade. É indicada tanto para formação de pastos novos em consórcio com gramíneas, quanto para plantio em pastos já estabelecidos. A taxa de semeadura recomendada é de 12 kg de sementes puras viáveis por hectare; em pastos já estabelecidos, recomenda-se o plantio em faixas.
Tipo: Folders Palavras-chave: Amendoim forrageiro; Forage peanut; Cacahuetes forrajeros; Nutrición animal; Prácticas de cultivo vegetal; Pastagem; Leguminosa Forrageira; Nutrição Animal; Pratica Cultural; Grazing; Forage legumes; Animal nutrition; Plant cultural practices.
Ano: 2019 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1115762
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Calculations of results in grazing experiments using the counting method 27
Tackx, M.L.M.; Van de Vrie, E.M..
Different formulae used in the literature for calculation of ingestion rates are reviewed. Their applicability is discussed in relation to two criteria: the occurrence of saturation of the feeding and/or growth of the food particles. It is shown by simulations that the differences in results obtained by calculating ingestion following a linear or an exponential model are restricted to a few percent. Calculation of ingestion rates by substantial over- or underestimation depending on the growth constant of the food particles and the grazing time.The formula I = Vk(C<sub>zt</sub>C<sub>zo</sub>e<sup>kt</sup>)/N(I-e<sup>kt</sup>) is proposed for the calculation of ingestion rates under saturated circumstances.It...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Food intake; Food intake; Grazing; Ingestion; Mathematical analysis; Measuring devices; Phytoplankton; Zooplankton.
Ano: 1985 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3212
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Canopy structure and forage nutritive value of elephantgrass subjected to different stocking rate and N fertilization in the “Mata Seca” ecoregion of Pernambuco 96
Dourado,Diego Loiola; Dubeux Junior,José Carlos Batista; Mello,Alexandre Carneiro Leão de; Santos,Mércia Virginia Ferreira dos; Lira,Mário de Andrade; Freitas,Erinaldo Viana de; Apolinário,Valéria Xavier de Oliveira; Santos,Erick Rodrigo da Silva.
ABSTRACT The objective was to evaluate the effect of three stocking rates (2, 3.9, and 5.8 animal units ha−1) and three fertilization levels (0, 150, and 300 kg N ha−1 yr−1) on herbage mass and nutritive value of elephantgrass (Pennisetum purpureum Schum.) cv. IRI-381. The experiment was conducted from May to August of 2009 and 2010 in Itambé, PE, Brazil, during the rainy season. Treatments were allocated in a split-plot arrangement in a completely randomized block design. The variables measured included leaf mass (pre- and post-grazing), botanical composition, soil cover, leaf area index, light interception, leaf angle, and concentrations of dry matter, organic matter, N, and in vitro digestible dry matter. When fertilized with 300 kg N ha−1 yr−1, leaf...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Grazing; Livestock; Nitrogen; Pasture; Pennisetum purpureum.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982019000100400
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Características estruturais de pastos de Brachiaria decumbens diferidos por 140 dias e estratégias de adubação nitrogenada - doi: 10.4025/actascianimsci.v33i4.10212 2
Teixeira, Fábio Andrade; UESB; Bonomo, Paulo; UESB; Pires, Aureliano José Vieira; UESB; Silva, Fabiano Ferreira; UESB; Martins, Giselle Caroline Fernandes; UESB; Cardoso, Elisângela Oliveira; UESB.
O objetivo deste trabalho foi avaliar as características estruturais de pastos de Brachiaria decumbens diferidos por 140 dias, visando determinar a estratégia mais adequada de adubação nitrogenada. Foram estudadas quatro estratégias de adubação no início e no final do verão (0-0, 100-0, 50-50, 0-100 kg ha-1 de N), respectivamente, com quatro repetições. Para avaliação das densidades volumétricas, a forragem foi colhida em três estratos: estrato A- acima de 40 cm; B- 20-40 cm; e C- 0-20 cm do solo. O índice de tombamento foi menor (p < 0,05) para a estratégia de adubação com 100 kg ha-1 de N aplicados no final do verão. No estrato B foram observadas maiores (p < 0,05) densidades de forragem total, de lâmina foliar e de colmo verde para estratégia de...
Tipo: Pesquisa de campo Palavras-chave: Forragicultura e pastagens acamamento; Densidade; Diferimento; Pastagem; Perfilho; Ureia falling; Density; Deferment; Grazing; Tiller; Urea.
Ano: 2011 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/10212
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CHAPA, BEEF COW/CALF HEALTH AND PRODUCTIVITY AUDIT, PART IV: BEEF COW/CALF BREEDING MANAGEMENT 31
Dargatz, David.
As part of the National Animal Health Monitoring System (NAHMS ), USDA:APHIS:Veterinary Services conducted a national study of beef production, the Beef Cow/Calf Health and Productivity Audit (CHAPA). This study was designed to provide both participants and the industry with information on cow/calf health, productivity, and management practices. The National Agricultural Statistics Service (NASS) collaborated with USDA:APHIS:VS to select a producer sample that was statistically designed to provide inferences about the nation's cow/calf population. Data for Part IV: Beef Cow/Calf Breeding Management were collected by federal and state veterinary officers (VMO's) in 18 of the largest cow/calf producing states between July 1 and July 30, 1993. These 18 states...
Tipo: Report Palavras-chave: NAHMS; Epidemiology; Beef cattle; Calves; Breeding; Mortality; Grazing; Trichomonas fetus; Vaccination; Deworming; Palpation; Livestock Production/Industries.
Ano: 1994 URL: http://purl.umn.edu/32753
Registros recuperados: 136
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