Dairy Wise, A Whole-Farm Dairy Model
| Autor: | J.C. van Middelkoop, A. van den Pol-van Dasselaar, G. Holshof, J.G.A. Hemmer, R.L.G. Zom, M.H.A. de Haan, René Schils, J.A. de Boer, A.G. Evers |
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| Jazyk: | angličtina |
| Rok vydání: | 2007 |
| Předmět: |
Crops
Agricultural LR - Environment Silage de-marke LR - Milieu Fresh Water netherlands Agricultural engineering Gross margin nitrogen Eating chemistry.chemical_compound Nutrient Nitrate ammonia volatilization Pregnancy nitrate Genetics Animals Alterra - Centrum Bodem Wageningen Environmental Research Nitrates Agroforestry Crop yield Research Variance (land use) Soil Science Centre transition Models Theoretical Ammonia volatilization from urea greenhouse-gas emissions Dairying chemistry Greenhouse gas Environmental science systems Cattle Female Animal Science and Zoology grassland Wageningen Livestock Research management Food Science Onderzoek |
| Zdroj: | Journal of Dairy Science, 90(11), 5334-5346 Journal of Dairy Science 90 (2007) 11 |
| ISSN: | 0022-0302 |
| Popis: | A whole-farm dairy model was developed and evaluated. The DairyWise model is an empirical model that simulated technical, environmental, and financial processes on a dairy farm. The central component is the FeedSupply model that balanced the herd requirements, as generated by the DairyHerd model, and the supply of homegrown feeds, as generated by the crop models for grassland and corn silage. The output of the FeedSupply model was used as input for several technical, environmental, and economic submodels. The submodels simulated a range of farm aspects such as nitrogen and phosphorus cycling, nitrate leaching, ammonia emissions, greenhouse gas emissions, energy use, and a financial farm budget. The final output was a farm plan describing all material and nutrient flows and the consequences on the environment and economy. Evaluation of DairyWise was performed with 2 data sets consisting of 29 dairy farms. The evaluation showed that DairyWise was able to simulate gross margin, concentrate intake, nitrogen surplus, nitrate concentration in ground water, and crop yields. The variance accounted for ranged from 37 to 84%, and the mean differences between modeled and observed values varied between -5 to +3% per set of farms. We conclude that DairyWise is a powerful tool for integrated scenario development and evaluation for scientists, policy makers, extension workers, teachers and farmers. |
| Databáze: | OpenAIRE |
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