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dc.contributor.authorDoole, Graeme J.
dc.contributor.authorRomera, Alvaro J.
dc.contributor.authorAdler, Alfredo A.
dc.date.accessioned2012-10-09T03:31:06Z
dc.date.available2012-10-09T03:31:06Z
dc.date.issued2012-04
dc.identifier.citationDoole, G.J., Romera, A.J. & Adler, A.A. (2012). A mathematical optimisation model of a New Zealand dairy farm: The integrated dairy enterprise (IDEA) framework. (Department of Economics Working Paper Series, Number 01/12). Hamilton, New Zealand: University of Waikato.en_NZ
dc.identifier.urihttp://hdl.handle.net/10289/6699
dc.description.abstractOptimisation models are a key tool for the analysis of emerging policies, price sets, and technologies within grazing systems. A detailed nonlinear optimisation model of a New Zealand dairy farming system is described. The framework is notable for its rich portrayal of pasture and cow biology that add substantial descriptive power to standard approaches. Key processes incorporated in the model include: (1) pasture growth and digestibility that differ with residual pasture mass and rotation length, (2) pasture utilisation that varies by stocking rate, and (3) different levels of intake regulation. Model output is shown to closely match data from a more detailed simulation model (deviations between 0 and 5 per cent) and survey data (deviations between 1 and 11 per cent), providing confidence in its predictive capacity. Use of the model is demonstrated in an empirical application investigating the relative profitability of production systems involving different amounts of imported feed under price variation. The case study indicates superior profitability associated with the use of a moderate level of imported supplement, with Operating Profit ($NZ ha-1) of 934, 926, 1186, 1314, and 1093 when imported feed makes up 0, 5, 10, 20 and 30 per cent of the diet, respectively. Stocking rate and milk production per cow increase by 35 and 29 per cent, respectively, as the proportion of imported feed increases from 0 to 30 per cent of the diet. Pasture utilisation increases with stocking rate. Accordingly, pasture eaten and nitrogen fertiliser application increase by 20 and 213 per cent, respectively, as the proportion of imported feed increases from 0 to 30 per cent of the diet.en_NZ
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.publisherUniversity of Waikatoen_NZ
dc.relation.ispartofseriesDepartment of Economics Working Paper Series
dc.rights©2012 The Authorsen_NZ
dc.subjectdairy productionen_NZ
dc.subjectmathematical optimisationen_NZ
dc.subjectwhole-farm modelen_NZ
dc.titleA mathematical optimisation model of a New Zealand dairy farm: The integrated dairy enterprise (IDEA) frameworken_NZ
dc.typeWorking Paperen_NZ
uow.relation.series01/12
pubs.elements-id54563


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