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| Neal, Mark; Fulkerson, William; Levy, Gil; Wastney, Meryl; Thorrold, Bruce S.; Palliser, Chris; Beukes, Pierre; Folkers, Chris. |
| Introducing a stocking rate restriction is one possible course of action for regulators to improve water quality where it is affected by nitrate pollution. To determine the impact of a stocking rate restriction on a range of New Zealand dairy farms, a whole-farm model was optimised with and without a maximum stocking rate of 2.5 cows per hectare. Three farm systems, which differ by their level of feed-related capital, were examined for the changes to the optimal stocking rate and optimal level of animal milk production genetics when utility was maximised. The whole-farm model was optimised through the use of an evolutionary algorithm called differential evolution. The introduction of a stocking rate restriction would have a very large impact on the... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Environmental regulation; Dairy farms; Whole-farm model; Evolutionary algorithm; Environmental Economics and Policy; Livestock Production/Industries; Q12; Q52; C61. |
| Ano: 2006 |
URL: http://purl.umn.edu/25620 |
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| Wilcock, Robert J.; Monaghan, Ross M.; Thorrold, Bruce S.; Meredith, Adrian S.; Betteridge, Keith; Duncan, Maurice J.. |
| Monitoring of five dairy farming catchment streams in New Zealand shows they have high concentrations of N and P forms and faecal indicator bacteria. Suspended solids (SS) concentrations are sometimes high because of poor riparian management. Trend analysis and specific yields of N, P and SS for two streams that have been monitored for five years indicates that little change has occurred in water quality. However, improved water quality has been detected in the trends for two streams that have been monitored for 10 years, as a result of reductions in point sources and improved stock management (less intensive grazing and better stream bank fencing) that have taken place over the longer period. Surveys of farm management practices have been conducted at... |
| Tipo: Journal Article |
Palavras-chave: Resource /Energy Economics and Policy. |
| Ano: 2007 |
URL: http://purl.umn.edu/48067 |
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| Harris, Simon; Doak, Murray; Ford, Stuart; Bywater, Tony; Bright, John; Thorrold, Bruce S.. |
| The understanding of how allocation decisions can maximise the economic returns to the community from water for irrigation has received little attention, but is a significant issue for regional councils, those interested in water allocation policy development, and for irrigated farmers. There is a tradeoff between the amount of irrigated area and the reliability with which it can be undertaken. Overseas studies have generated a curve with optimum levels of allocation which maximise the economic return to the community from the resource. The study on which this paper is based used a single case study to model the individual and regional economic outcomes for four scenarios of water allocation, using daily time step simulation models of the hydrological,... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Irrigation; Reliability; Regional economic impacts; Agribusiness; Agricultural and Food Policy; Agricultural Finance; Community/Rural/Urban Development; Environmental Economics and Policy; Farm Management; Financial Economics; Institutional and Behavioral Economics; Land Economics/Use; Resource /Energy Economics and Policy. |
| Ano: 2005 |
URL: http://purl.umn.edu/98516 |
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