Document Detail

A spreadsheet model for developing field indicators and grazing management tools to meet environmental and production targets for dairy farms.
MedLine Citation:
PMID:  16684587     Owner:  NLM     Status:  MEDLINE    
Changes in livestock farm structure, such as increasing land area per animal, as well as developments in national and European agricultural policies may lead to changes in grazing and fertilizer management practices for environmental or economic reasons. To facilitate choices and the learning of new practices at the farm level, such as the amount of land to allocate for grazing or of fertilizer to apply, we propose to combine a simplified grass growth and N model with two sward indicators. One assesses the sward nitrogen status to evaluate animal excreted N; the other assesses the standing herbage mass to characterize the grazing management. Following a description of the model (first part), we use it as a research tool for highlighting grazing management (second part). First we analyze how stocking rate, N excreted, grazing and N use efficiency varied according to management (i.e., the time between two grazing events), sward (N status, leaf lifespan) and weather characteristics. Next we use it for determining field indicator thresholds at key periods that allow agricultural and environmental aims to be met; these thresholds being intended to give guidance to meet farmers' objectives. In the last part, we illustrate how to combine model and field indicators for planning and monitoring a management strategy suitable for the management of risks.
M Duru; J E Bergez; L Delaby; E Justes; J P Theau; J Viégas
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Publication Detail:
Type:  Journal Article     Date:  2006-05-08
Journal Detail:
Title:  Journal of environmental management     Volume:  82     ISSN:  0301-4797     ISO Abbreviation:  J. Environ. Manage.     Publication Date:  2007 Jan 
Date Detail:
Created Date:  2006-11-27     Completed Date:  2007-03-09     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401664     Medline TA:  J Environ Manage     Country:  England    
Other Details:
Languages:  eng     Pagination:  207-20     Citation Subset:  IM    
UMR INRA-ENSAT ARCHE, Chemin de Borde Rouge, BP27, 31326 Castanet Tolosan, France.
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MeSH Terms
Animal Feed
Animals, Domestic
Conservation of Natural Resources*
Environmental Monitoring* / methods
Models, Theoretical*
Nitrogen / chemistry
Reg. No./Substance:
0/Fertilizers; 7727-37-9/Nitrogen

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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