Subclinical pneumonia in lambs |
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Authors: | DC Thurley BW Boyes DH Davies MF Wilkins E O'Connell S Humphreys |
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Institution: | Wallaceville Animal Research Centre, Research Division , Ministry of Agriculture and Fisheries , Private Bag, Upper Hutt, New Zealand |
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Abstract: | Groups of lambs were either slaughtered at weekly intervals between November and June, or regularly sampled over this period. The number of isolations of Pasteurella haemolytica and Mycoplasma sp. from the lungs increased during the later part of two seasons, as did the incidence of lesions typical of enzootic pneumonia. P. haemolytica was frequently isolated after February from nasal swabs in spite of the presence of serum antibody titres against this organism. Serum antibody titre to two adenoviruses were found to fall to a low level, one in January, the other in May, and then to rise again. Virus isolations were made at the time the homologous antibody titres were lowest. |
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