Effect of vaccinating lambs against pneumonic pasteurellosis under New Zealand field conditions on their weight gain and pneumonic lung lesions at slaughter

The Veterinary Record
K A Goodwin-RayC Heuer

Abstract

In a field trial, 9174 lambs from seven commercial sheep flocks with a history of subclinical pneumonia were either vaccinated with Ovipast Plus (Intervet) or given a placebo by systematic random allocation; they were vaccinated twice at an interval of four to six weeks and grazed on pasture in the same paddocks. They were weighed at the first vaccination, 11 and 23 weeks later, and one to three days before they were slaughtered. The extent of the pneumonic lesions in their lungs was scored visually postmortem. A subset of pneumonic lung samples was examined bacteriologically and histopathologically. There were no statistically significant differences between the pneumonic lesions at slaughter or the mean average daily weight gains of the vaccinated and placebo-treated lambs between 11 and 23 weeks or between first vaccination and slaughter. The vaccinated lambs had a lower mean daily gain between first vaccination and 11 weeks. The extent of pneumonic lesions at slaughter was negatively correlated with the mean daily gain between first vaccination and slaughter. There were no significant differences between the frequency of isolation of Mannheimia (Pasteurella) haemolytica and Pasteurella trehalosi or the histopathological cla...Continue Reading

Citations

Dec 17, 2009·Animal Health Research Reviews·Anthony W Confer
Jun 10, 2008·New Zealand Veterinary Journal·K A Goodwin-RayN Cogger
May 9, 2012·Veterinary Medicine International·David S MillerCleon Kimberling
Mar 11, 2008·The Veterinary Record·Andrew Dowling

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