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| Registros recuperados: 46 | |
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| KADOHIRA, Mutsuyo; TAJIMA, Motoshi; 門平, 睦代. |
| The Betsukai town office implemented bovine viral diarrhea virus (BVDV) preventive activities (i.e., vaccination and surveillance) in 2006. Using bulk tank milk screening followed by individual blood tests using a Reverse Transcription-Polymerase Chain Reaction (RT-PCR) method, persistent infection (PI) cattle were detected and eliminated from the population. Based on data for PI cattle detected between 2006 and 2007, we conducted a case control study to find risk factors associated with the presence of PI cattle. Significantly associated farm level factors for increasing risk of producing PI cattle include; 1) no recent purchase of cattle (between 2004 and 2007) and 2) no prevention of people/animals entering the premises. This study suggests that not... |
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Palavras-chave: Biosecurity; BVDV infection; Case control study; Hokkaido/Japan. |
| Ano: 2010 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4126 |
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| Kompas, Tom; Chu, Long. |
| We use a bang-bang optimal control model to derive a rule of thumb for an optimal management of invasive weeds, in terms of the marginal benefits and costs of various control actions. Instead of determining the size of infestation under an optimal surveillance measure, the rule specifies the types of land where an invasive weed should be first prevented from establishment, and under what conditions control should be initiated. The types of land are modeled via the heterogeneous vulnerability of land to the weed and likely infestation. This easy-to-use rule is applied to determine how hawkweed should be controlled in Australia, across three potential control strategies: containment, eradication and no action. We investigate this rule-of-thumb in both... |
| Tipo: Journal Article |
Palavras-chave: Stochastic optimal control; Biosecurity; Invasive weed management; Hawkweed; Crop Production/Industries. |
| Ano: 2010 |
URL: http://purl.umn.edu/95046 |
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| Hennessy, David A.. |
| We develop a dynamic capital valuation model in which each farm can take an action with farm-varying cost to increase the probability of not contracting a disease. In the presence of infection externalities, circumstances are identified under which multiple equilibria exist and where the one involving the most extensive set of action takers is socially optimal. It is suggested that costly capital markets are one factor in determining the extent of endemic disease in a region. The introduction of frictions, such as dealing with a cumbersome veterinary public health bureaucracy, can enhance social welfare by encouraging precautionary biosecurity actions. Some technical innovations can reduce social welfare. The model is also extended to study a voluntary... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Biosecurity; Continuous time; Multiple equilibria; Nash behavior; Reinfection; Livestock Production/Industries. |
| Ano: 2005 |
URL: http://purl.umn.edu/18330 |
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| Abougamos, Hoda; White, Benedict; Sadler, Rohan. |
| The export of grain from Western Australia depends upon a grain supply network that takes grain from farm to port through Cooperative Bulk Handling receival and storage sites. The ability of the network to deliver pest free grain to the port and onto ship depends upon the quality of grain delivered by farmers and the efficacy of phosphine based fumigation in controlling stored grain pests. Phosphine fumigation is critical to the grain supply network because it is the cheapest effective fumigant. In addition, it is also residue free. Unfortunately, over time, common stored-grain pests have evolved to develop resistance to phosphine and there is a risk that phosphine will become less effective and may need to be replaced with more expensive alternative... |
| Tipo: Presentation |
Palavras-chave: Principal-agent model; Supply contracts; Moral hazard; Stored grain; Biosecurity; Crop Production/Industries. |
| Ano: 2012 |
URL: http://purl.umn.edu/124216 |
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| Ott, Stephen L.. |
| The NAHMS Dairy '96 Study was designed to provide both participants and the industry with information on the nation's dairy animal population for education and research. This report contains demographic changes of the U.S. and world dairy industry from a historical perspective from data provided by the National Agricultural Statistics Service (NASS), Census of Agriculture, and Foreign Agriculture Service. Results of two NAHMS national studies overview changes in the U.S. dairy industry in the 5-year period of 1991 to 1996. The 1991 National Dairy Heifer Evaluation Project included herds of 30 or more milk cows and heifer-rearing operations in 28 states representing 83 percent of U.S. milk cows. NAHMS Dairy '96 described dairy production for operations... |
| Tipo: Report |
Palavras-chave: NAHMS; Dairy; Cattle; Demographics; Breed; Rolling herd average; Milk; Feed; Weaning; Vaccination; Morbidity; Mortality; Housing; Biosecurity; Livestock Production/Industries. |
| Ano: 1996 |
URL: http://purl.umn.edu/32741 |
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| Ott, Stephen L.. |
| The NAHMS Dairy '96 Study was designed to provide both participants and the industry with information on the nation's dairy animal population for education and research. The USDA's National Agricultural Statistics Service (NASS) collaborated with NAHMS to select a statistically valid sample yielding 2,542 producers. Included in the study were 20 states that represented 83.1 percent of the U.S. milk cows as of January 1, 1996. Veterinary Medical Officers (VMO's) and Animal Health Technicians (AHT's) collected data for Part III from 1,219 operations that had 30 or more milk cows on January 1, 1996, from February 20 through May 24, 1996. Contact for this paper: Steven Ott |
| Tipo: Report |
Palavras-chave: NAHMS; Dairy; Cattle; Health; Mastitis; Labor; Antibiotics; Biosecurity; Vaccination; Manure management; Livestock Production/Industries. |
| Ano: 1996 |
URL: http://purl.umn.edu/32752 |
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| Le Groumellec, Marc; Rigolet, Vincent; Panchayuthapani, Duraisamy; Vandeputte, Marc; Rao, Vemulapalli Manavendra. |
| The shrimp farming industry in the western Indian Ocean started with Aqualma’s project in 1989, and now several companies farm shrimp in the Mozambique Channel. Despite the remoteness of these projects and their high investment and operating costs, they compete in the global marketplace by efficiently producing high value quality products. To address sustainability and biosecurity issues, Aqualma developed domesticated specific pathogenfree (SPF) broodstock of Penaeus monodon from western Indian Ocean stocks, which have been its exclusive source of post-larvae since 2003. Specific molecular diagnostic tools have been developed for each endemic pathogen detected since 1996, and these are used for routine surveillance of Aqualma’s shrimp stocks along with... |
| Tipo: Text |
Palavras-chave: Shrimp; Madagascar; Domestication; Biosecurity; Certification. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00099/20980/18604.pdf |
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| Hennessy, David A.. |
| Concerns about biosecurity in the food system raise a variety of issues about how the system is presently organized, why it might be vulnerable, what one could reasonably do to better secure it, and the costs of doing so. After presenting some facts about US agriculture and food, this paper considers three economic aspects of the general problem. One is the global problem, or the way biosecurity measures can affect how countries relate to each other and the global consequences that result. Another is how to best manage the immediate aftermath of a realized threat in order to minimize damage. The third is how to seek to prevent realization of the threat. Some policy alternatives are also presented. |
| Tipo: Working or Discussion Paper |
Palavras-chave: Agro-terrorism; Animal disease; Biosecurity; Epidemic; Food system policy; Food Consumption/Nutrition/Food Safety. |
| Ano: 2007 |
URL: http://purl.umn.edu/9371 |
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| Hennessy, David A.. |
| Infectious livestock disease creates externalities for proximate animal production enterprises. The distribution of production scale within a region should influence and be influenced by these disease externalities. Taking the distribution of the unit costs of stocking an animal as primitive, we show that an increase in the variance of these unit costs reduces consumer surplus. The effect on producer surplus, total surplus, and animal concentration across feedlots depends on the demand elasticity. A subsidy to smaller herds can reduce social welfare and immiserize the farm sector by increasing the extent of disease. While Nash behavior involves excessive stocking, disease effects can be such that aggregate output declines relative to first-best. Disease... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Agricultural industrialization; Biosecurity; Inefficiency; Nash behavior; Overinvestment; Technology adoption; Livestock Production/Industries. |
| Ano: 2006 |
URL: http://purl.umn.edu/18623 |
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| Registros recuperados: 46 | |
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