Productivity And Grazing Capacity Of Five Typical Natural Rangelands For Yaks In The Alpine Region Of China,
2023
Zhengzhou College of Animal Husbandry, China
Productivity And Grazing Capacity Of Five Typical Natural Rangelands For Yaks In The Alpine Region Of China, Xuebing Yan, Yuxia Guo, Z. He, W. Kun
IGC Proceedings (1997-2023)
The Qinghai-Tibet plateau has greatly aroused the interest of scientists as an uncommon rangeland resource of great agro-ecological importance. Yak (Bos grunniens) is a unique, vulnerable ungulate. The objective of this experiment was to evaluate the productivity and feed value of five natural rangelands.
An Examination Of The Diurnal Variability In Nitrous Oxide Emissions,
2023
Teagasc, Ireland
An Examination Of The Diurnal Variability In Nitrous Oxide Emissions, B. P. Hyde, A. F. Fanning, M. Ryan, O. T. Carton
IGC Proceedings (1997-2023)
It is generally assumed in field experiments, that the measurement of nitrous oxide (N2O) using enclosed chambers for a period of 1 hour can be used to provide an estimate of daily emission rates. In the majority of studies, emission measurements are conducted between 0900 and 1300 h. However, clearly defined diurnal cycles in N2O emission rates have been observed from both agricultural and forest soils in temperate regions as a consequence of diurnal fluctuations in temperature (Blackmer et al., 1982; Ball et al., 1999; Baggs et al., 2002). The objective of this …
Fluxes Of Co2 And N2O From Soils Of A Grazed Pasture In Ireland,
2023
University of Dublin, Ireland
Fluxes Of Co2 And N2O From Soils Of A Grazed Pasture In Ireland, S. Kumar, M. Abdalla, P. Ambus, A. Mccourt, J. Clifton-Brown, J. Burke, M. Jones, M. L. Willliams
IGC Proceedings (1997-2023)
As part of a European research program on greenhouse gas flux measurements from agricultural systems, a three year study of both CO2 and N2O fluxes from grassland soils has been established in Ireland. Results presented in this paper represent a preliminary exercise in the modelling of soil respiration.
Net Ecosystem Productivity Of A Grassland In Comparison With An Arable And A Forest Ecosystem,
2023
University College Dublin, Ireland
Net Ecosystem Productivity Of A Grassland In Comparison With An Arable And A Forest Ecosystem, Phillip A. Davis, K. Black, J. Clifton-Brown, G. Lanigan, J. Burke, A. Fortune, M. B. Jones, B. Osborne
IGC Proceedings (1997-2023)
Grassland, arable farming and forests are the major land use categories in Ireland and it is, therefore, important to know the carbon-source/sink strengths of these land use types. Forest ecosystems are also an important and fast growing land use category in Ireland. Here we present a comparison of the net ecosystem productivity (NEP) of these three land use categories (grass land, arable and forest) from three sites.
Sources And Sinks Of Greenhouse Gases From European Grasslands And Mitigation Options: The ‘Greengrass’ Project,
2023
INRA, France
Sources And Sinks Of Greenhouse Gases From European Grasslands And Mitigation Options: The ‘Greengrass’ Project, Jean-François Soussana, V. Allard, P. Ambus, C. Amman, P. Berbigier, C. Campbell, P. Cellier, E. Ceschia, P. Ciais, J. Clifton-Brown, S. Czóbel, R. Domingues, T. De Groot, R. Falcimagne, C. Flechard, J. Fuhrer, G. Gaborit, L. Horváth, A. Hensen, M. B. Jones, S. Jones, G. Kasper, K. Klumpp, P. Laville, C. Martin, C. Milford, Z. Nagy, A. Neftel, E. Nemitz, J. E. Olesen, A. Patterson, K. Pilegaard, A. Raschi, R. Rees, U. Skiba, P. Stefani, S. Salètes, P. Smith, M. A. Sutton, Z. Tuba, A. Van Amstel, A. Van Den Pol-Van Dasselaar, N. Viovy, N. Vuichard, M. Wattenbach, T. Wedinger
IGC Proceedings (1997-2023)
Adapting the management of grasslands may be used to enhance carbon sequestration into soil, but could also increase N2O and CH4 emissions. In support of the European post-Kyoto policy, the European 'GreenGrass' project (EC FP5, EVK2-CT2001-00105) has three main objectives: i) to reduce the large uncertainties concerning the estimates of CO2, N2O and CH4 fluxes to and from grassland plots under different climatic conditions and assess their global warming potential, ii) to measure net greenhouse gas (GHG) fluxes for different management which reflect potential mitigation options, iii) to construct a model of …
Production And Plant Density Of Sulla Grazed By Sheep At Three Growth Stages,
2023
Massey University, New Zealand
Production And Plant Density Of Sulla Grazed By Sheep At Three Growth Stages, H. Krishna, Peter D. Kemp
IGC Proceedings (1997-2023)
Sulla is one of the few temperate forage legumes that contain enough condensed tannins to improve the efficiency with which livestock use protein (Marshall et al. 1979). However, it usually is productive only for approximately 14 months in New Zealand, and little is known of its response to grazing. This paper reports on the production and persistence of Sulla cv. Necton, when using growth stage as the criterion for time of grazing by sheep in a maritime, temperate environment.
Sward Composition, Forage Yield, And Grazing Effects In Kura Clover And Grass Mixtures,
2023
South Dakota State University
Sward Composition, Forage Yield, And Grazing Effects In Kura Clover And Grass Mixtures, Peter Jeranyama, Richard Leep, Tim Dietz, D. Min
IGC Proceedings (1997-2023)
Rotational stocking on mixed pastures of cool season grasses (C3) and kura clover (Trifolium ambiguum Bieb.) can be a sustainable way to reduce cattle feed costs. Kura clover is a long-lived rhizomatous perennial legume of good forage quality under grazing. However, the suitability of diverse grass species in binary mixtures with kura clover has not been reported extensively. This experiment aimed to evaluate sward composition, forage dry matter yield, and post-grazing residue in mixed kura clover and C3 grass pastures.
Metabolic Profiling Of Heathland Plants In The Diet Of Sheep,
2023
Institute of Grassland and Environmental Research, UK
Metabolic Profiling Of Heathland Plants In The Diet Of Sheep, Gordon G. Allison, Mariecia D. Fraser, J. M. Moorby, J. Kopka, A. Erban, Vince J. Theobald
IGC Proceedings (1997-2023)
Little is known about how plant biochemistry influences the grazing behaviour of animals grazing heterogeneous vegetation communities. Furthermore, most biochemical profiles of grassland species are restricted to major nutritional characteristics. Recent developments in analytical techniques have made possible the detailed analysis of minor components, which can potentially affect animal feeding preferences, performance and health. Gas chromatography/time of flight mass spectroscopy (GC/TOF-MS) coupled with automated library annotation is ideally suited to the acquisition of detailed metabolite profiles of plant extracts (Wagner et al., 2003) and can be applied to other matrices such as blood and faeces. In this study GC/TOF-MS …
Grazing Behaviour And Selection Of Browse Species By Cattle, Sheep And Goats On Natural Pasture In The Sahelian Zone Of Burkina Faso,
2023
INERA, Burkina Faso
Grazing Behaviour And Selection Of Browse Species By Cattle, Sheep And Goats On Natural Pasture In The Sahelian Zone Of Burkina Faso, H. O. Sanon, C. Zoungrana-Kabore, I. Ledin
IGC Proceedings (1997-2023)
Pastures in semi-arid countries, are subject to seasonal variability. Browse species that are less dependent on rainfall, are highly valued. Goats are browsers, while cattle and sheep are grazers. However, faced with a scarcity of feed resources, especially in the late dry season, all animal species fall back on browse species. The objective of this study was to estimate feeding behaviour and browse species utilisation by cattle, sheep and goats on natural pasture in different seasons, and concurrently appreciate the indigenous knowledge on browse species in the study area.
Seasonal Variation Of Taproot Biomass And N Content Of Lucerne Crops Under Contrasting Grazing Frequencies,
2023
Lincoln University, New Zealand
Seasonal Variation Of Taproot Biomass And N Content Of Lucerne Crops Under Contrasting Grazing Frequencies, E. I. Teixeira, D. J. Moot, H. E. Brown, M. Mickelbart
IGC Proceedings (1997-2023)
Taproot nitrogen reserves (TN, kg N/ha) a function of N concentration within taproots (N%) and taproot biomass (TBM) are a major determinant of lucerne (Medicago sativa L.) growth rates after defoliation and in early-spring (Avice et al., 1997b). Several studies have shown that N% changes with seasons (Cunninghan & Volenec, 1998) and defoliation frequencies (Avice et al., 1997a). However the seasonal pattern of TBM deserves further investigation as the dynamics of root reserves is a weak point in lucerne simulation models (Confalonieri & Bechini, 2004). The objective of this experiment was to assess the seasonal variation in …
Herbage Accumulation And Vegetation Structure In Tanzâniagrass (Panicum Maximum, Jacq. Cv Tanzania) Pasture Submitted To Regime Of Intermittent Stocking,
2023
Instituto de Zootecnia, Brazil
Herbage Accumulation And Vegetation Structure In Tanzâniagrass (Panicum Maximum, Jacq. Cv Tanzania) Pasture Submitted To Regime Of Intermittent Stocking, Ana C. Ruggieri, Carlos A. M. Gomide, Estella R. Janusckiewicz, E. D. Contato, R. A. Reis
IGC Proceedings (1997-2023)
Knowledge of pasture structure characteristics such as height, tillering density, leaf area index (LAI) and herbage mass (HM), together with growth rates and forage accumulation, can become important tools to indicate improvements to the production system. This experiment evaluated the structural and productive characteristics and persistence of a Tanzaniagrass pasture.
Dormant-Season Carbon Fluxes In Humid-Temperate Pastures,
2023
U.S. Department of Agriculture
Dormant-Season Carbon Fluxes In Humid-Temperate Pastures, Howard Skinner
IGC Proceedings (1997-2023)
Human induced increases in atmospheric CO2 through the burning of fossil fuels and deforestation are considered to be a primary cause of rising global temperatures. However, carbon sequestration by terrestrial ecosystems has reduced the rate of CO2 accumulation in the atmosphere. Because of their vast size, grazing lands have the potential to sequester significant quantities of carbon, slowing the increase in atmospheric CO2 and reducing the risk of global warming. Although C uptake during the growing season can be substantial, losses following defoliation and drought, and during the winter months can significantly reduce annual sequestration, frequently turning …
Impact Of Climate Change On Potential Distribution And Relative Abundance Of The Migratory Grasshopper (Orthoptera: Acrididae) In The Prairie Ecosystem Of Canada,
2023
Agriculture and Agri-Food Canada, Canada
Impact Of Climate Change On Potential Distribution And Relative Abundance Of The Migratory Grasshopper (Orthoptera: Acrididae) In The Prairie Ecosystem Of Canada, Owen Olfert, R. Weiss
IGC Proceedings (1997-2023)
Climate is the dominant force determining the distribution and abundance of most insect pest species. There has been considerable concern in recent years about climatic warming caused by human activities and the affects of these changes on agriculture in North America. Warming conditions may affect insect populations by altering timing of emergence, increased growth and development rates, shorter generation times and reduced overwintering mortality (McCarthy et al. 2001). Given that the magnitude of predicted temperature change associated with global warming is beyond the historical experience of modern agriculture computer models are one method by which researchers can study the possible …
The Effect Of Legume/Grass Pasture On Soil Organic Carbon,
2023
The Lithuanian Institute of Agriculture, Lithuania
The Effect Of Legume/Grass Pasture On Soil Organic Carbon, Z. Kadziuliene, Alvyra Slepetiene
IGC Proceedings (1997-2023)
Soil organic carbon content is an important integral indicator of soil fertility. The extent at which the soil can sequestrate carbon depends on the nature of agricultural production, land use and soil type (Follet, 2001). More than two thirds of the annual grassland biomass production is allocated to below ground structures and deep humus layers are common in grassland (Körner, 2002). Grasslands differ markedly in species composition, utilisation purpose, fertilisation and this can significantly change their effect on soil organic content (Hassink & Neeteson, 1991). The objective of study was to estimate changes in the soil organic carbon content and …
A Systems Approach To Managing Greenhouse Gases On New Zealand Sheep And Beef Farms,
2023
AgResearch Grasslands, New Zealand
A Systems Approach To Managing Greenhouse Gases On New Zealand Sheep And Beef Farms, M. G. Lambert, H. Clark
IGC Proceedings (1997-2023)
Agriculture contributes more than 50% of New Zealand's greenhouse gas (GHG) emissions, mainly through release of methane (CH4) and nitrous oxide (N2O) from pastoral farms. Decisions on implementation of mitigation strategies will be made by individual farmers, who seek also to maintain financial performance in the face of declining terms of trade for commodities, hence leading to pressure to further intensify production. New Zealand (NZ) sheep & beef farms are typically hill country properties with a mixture of steep and easier topography, and year-round grazing of mainly permanent pastures. Specific GHG mitigation technologies will be difficult …
Methane Emissions Of Dairy Cows In Irish Spring-Calving, Grass Based Production Systems,
2023
University College Dublin, Ireland
Methane Emissions Of Dairy Cows In Irish Spring-Calving, Grass Based Production Systems, Frank O'Mara, D. K. Lovett
IGC Proceedings (1997-2023)
Countries which sign up to the Kyoto Protocol on greenhouse gas emissions are required to return annual inventories of greenhouse gas emissions, including methane emissions from farm livestock. Countries with large agricultural emissions are encouraged to derive specific emission factors (annual production of methane per animal in a specified animal class) for their livestock populations, rather than relying on default emission factors provided by IPCC (1996). In this paper, we describe how an emission rate of methane from enteric fermentation for spring-calving dairy cows in Irish production systems has been derived.
Nitrogen Leaching From A Timothy Sward Following Application Of Anaerobically Digested Cattle Slurry In Japan,
2023
Rakuno Gakuen University, Japan
Nitrogen Leaching From A Timothy Sward Following Application Of Anaerobically Digested Cattle Slurry In Japan, T. Matsunaka, T. Sawamoto, H. Ishmura, K. Takakura, A. Takekawa
IGC Proceedings (1997-2023)
The objective of this study was to quantitatively evaluate nitrogen (N) leaching from a Phleum pratense pasture following application of anaerobically digested cattle slurry by monitoring N uptake by the grass, NH3 volatilisation, N2O emission, and NO3 leaching in a lysimeter trial.
Rainfall And Grazing Impacts On The Population Dynamics Of Bothriochloa Ewartiana In Tropical Australia,
2023
Department of Primary Industries and Fisheries, Australia
Rainfall And Grazing Impacts On The Population Dynamics Of Bothriochloa Ewartiana In Tropical Australia, David M. Orr, Peter J. O'Reagain
IGC Proceedings (1997-2023)
Bothriochloa ewartiana (desert bluegrass) is a palatable, native perennial (C4) grass of considerable importance to the northern Australian grazing industry. However, little is known of the interaction between grazing pressure and the highly variable rainfall found in this area, on its population dynamics. This paper reports interim results (1998-2004) from a long-term study, in which its population dynamics were examined under 3 grazing strategies.
Root And Vigor Response Of Big Bluestem To Summer Grazing Strategies,
2023
University of Nebraska‐Lincoln
Root And Vigor Response Of Big Bluestem To Summer Grazing Strategies, E. M. Mousel, W. H. Schacht, L. E. Moser, C. W. Zanner
IGC Proceedings (1997-2023)
Warm-season grasses e.g., big bluestem (Andropogon gerardii Vitman) are great potential sources of summer forage in eastern Nebraska. Frequent, intensive defoliation can reduce root mass and limit root distribution. Quantifying root structure response to multiple defoliation events in a grazing situation is critical to develop management plans for these types of grasses. This experiment aimed to quantify the cumulative effects of timing and frequency of grazing on root structure and organic reserve estimates in big bluestem pastures.
Effect Of Grazing Management On Herbage Accumulation Of Lucerne-Orchard Grass Sward,
2023
Colegio de Postgraduados, México
Effect Of Grazing Management On Herbage Accumulation Of Lucerne-Orchard Grass Sward, A. Hernández Garay, José L. Zaragoza Ramírez, J. Pérez-Pérez, S. González-Muñoz, J. Herrera-Haro, G. F. Osnaya, Pedro A. Martínez-Hernández, Adrián R. Quero-Carrillo, J. F. Enriquez-Quiroz
IGC Proceedings (1997-2023)
Throughout most of México, lucerne (Medicago sativa) is the primary forage legume used in the dairy industry. Unfortunately, lucerne does not grow in late autumn and winter due to adverse weather. Recent studies with lucerne have suggested that the inclusion of a companion grass will invariably increase the seasonal distribution and total annual yield of swards (Laidlaw & Teuber, 2001). However the management of mixed swards containing lucerne is difficult as a grazing frequency or intensity which suits one species may be detrimental to the other. Changes in balance between grass and legume, especially in grazed swards, have …
