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| Weldegebriel, Habtu T.; Gunn, George J.; Stott, Alistair W.. |
| In this paper, we evaluated the welfare effects of a hypothetical programme of Johne's disease eradication from the Scottish dairy herd on different stakeholders in the domestic milk market. We undertook the evaluation using a Markov-Chain simulation and applying an economic welfare analysis which takes into consideration the effects of an eradication programme on product price, on output quantity, on cost and on milk yield for given levels of supply and demand elasticities. We found that, following the eradication of the disease, milk yield per cow increased for all herd sizes in Scotland whereas price and unit cost of milk production fell. Consequently, milk consumers gained around £14.3 million in discounted economic surplus and producers with infected... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Johne's; Eradication programme; Economic welfare effects; Economic surplus; I180. |
| Ano: 2008 |
URL: http://purl.umn.edu/36872 |
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| Stott, Alistair W.; Gunn, George J.; Varo Barbudo, Antonio. |
| A survey of the management of reproduction on 66 Scottish suckler herds calving in spring 2003 was analysed using multiple regression. The predicted mean value of suckled calves produced was £237/cow (SE 1.8). The regression coefficients of the predictors was 0.74 (0.05), 15 (3.9) and 248 (16.5) for date of first calving, average number of 21-day calving periods (calving spread) and proportion of cows barren respectively. Improving each predictor by 1 SD had the combined potential to improve predicted calf value by £64/cow, over 80% of the current typical gross margin for this type of enterprise. Bull care had a significant influence on calving spread and number of biosecurity measures taken had a positive influence on the proportion of cows barren.... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Beef cow; Fertility; Economics; Management; Livestock Production/Industries. |
| Ano: 2008 |
URL: http://purl.umn.edu/36871 |
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| Stott, Alistair W.; Brulisauer, Franz; Fraser, Fiona; Gunn, George J.. |
| A methodology is described to establish the relative financial benefit of farm animal disease prevention (biosecurity). This methodology is demonstrated using the example of bovine viral diarrhoea virus (BVDV) incursion on beef suckler farms in Scotland. A random sample of 276 herds was taken and a proportion of young stock on each farm tested for previous exposure to BVDV. There was evidence that 0.4 of herds had been exposed over one year prior to sampling. All herds completed a questionnaire about their biosecurity practices. The influence of these practices on relative risk of BVDV was subjected to a Chi squared test and practices ranked accordingly. Most important risk factors were animal buying in strategy, farm size and a single farm boundary. The... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Livestock Production/Industries; Biosecurity; BVD; Economic Impact. |
| Ano: 2009 |
URL: http://purl.umn.edu/51077 |
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| Stott, Alistair W.; Milne, Catherine E.; Gunn, George J.. |
| An epidemiological model is described that closely mimicked results of a published serological study of natural transmission of Maedi-Visna virus in a low ground flock of sheep. We adjusted parameters in the model from this baseline to explore the possible implications for the control of Maedi-Visna virus in typical British flocks. On closed hill farms, low probability of effective contact was most critical for control. In open low ground flocks, purchasing accredited replacements eliminated disease spread, otherwise flock size was the most important factor governing flock prevalence. Results highlighted the need for more epidemiological information about Maedi-Visna, particularly whether hill farms act as a hidden reservoir of virus or reduce the impact... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Livestock Production/Industries; Maedi-Visna; Model; Markov Chain; Sheep; Control. |
| Ano: 2009 |
URL: http://purl.umn.edu/61102 |
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