A stochastic partial-budget analysis of an experimental Pasteurella haemolytica feedlot vaccine trial

Gummow, Bruce, and Mapham, Patrick H. (2000) A stochastic partial-budget analysis of an experimental Pasteurella haemolytica feedlot vaccine trial. Preventive Medicine, 43 (1). pp. 29-42.

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Abstract

A field trial compared a modified Pasteurella haemolytica biotype A serotype 1 leukotoxin vaccine to a commercial vaccine during March–July 1995 in a Natal Midlands, South African, feedlot. Weaners/long weaners purchased by the feedlot were allocated systematically into test vaccine and control vaccine groups of 1241 and 1240 head, respectively, and fed in groups of approximately 200 head. Morbidity and mortality were monitored until the animals were marketed. Details of pleuritis and pneumonia at veterinary meat inspection were recorded for 409 test-vaccinated and 424 control-vaccinated cattle. An increase in morbidity but not mortality risk of respiratory disease was shown between test (13.8% morbidity) and control (11.4% morbidity) groups. Cattle with a processing weight <245 kg were 1.4 times more likely to develop respiratory diseases than cattle with a processing weight ≥245 kg. Cattle bought on auction were 1.6 times more likely to develop respiratory disease than cattle bought at private sales.

A partial farm budget incorporating Latin Hypercube sampling of uncertain variables was done to obtain the distribution of possible financial outcomes if the test vaccine were used. Impact (sensitivity) analyses indicated that median weight of carcass cut away had the greatest impact on the profit margin. The partial farm budget highlighted the importance of reducing sub-clinical lesions in a feedlot.

Item ID: 18684
Item Type: Article (Refereed Research - C1)
Keywords: cattle-microbiological diseases; feedlot; vaccination; pasteurella haemolytica
ISSN: 1096-0260
Date Deposited: 30 May 2012 22:29
FoR Codes: 07 AGRICULTURAL AND VETERINARY SCIENCES > 0707 Veterinary Sciences > 070704 Veterinary Epidemiology @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970107 Expanding Knowledge in the Agricultural and Veterinary Sciences @ 100%
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