Vaccination against swine enzootic pneumonia in field conditions: effect on clinical, pathological, zootechnical and economic parameters.
A field study was carried out to evaluate the effect of vaccination against swine enzootic pneumonia in different production systems (closed or one-site, and open, two- or three-site, systems). The percentage of mortality showed statistically significant differences (p < 0.001) in favour of vaccination in all the production systems examined. Zootechnical and economic parameters also reflected the benefits of vaccination, although only the feed conversion ratio showed statistically significant differences (p < 0.030). A macroscopic study of lungs at slaughter pointed to statistically significant differences (p < 0.001) in favour of vaccination in the one- and two-site production systems. The histopathological and immunocytochemical study showed complete concordance with the macroscopic diagnosis (p < 0.001). Such relationship confirms the suitability of macroscopic diagnosis in field conditions.
Pallarés
F J
FJ
U. D. Histología y Anatomía Patológica, Facultad de Veterinaria, Universidad de Murcia, Spain. pallares@um.es
Gómez
S
S
Ramis
G
G
Seva
J
J
Muñoz
A
A
D000003:Abattoirs; D000818:Animals; D000907:Antibodies, Bacterial / Q000097:blood; D001428:Bacterial Vaccines / Q000191:economics / Q000276:immunology; D005260:Female; D007150:Immunohistochemistry / Q000662:veterinary; D007273:Injections, Intramuscular / Q000662:veterinary; D008168:Lung / Q000473:pathology; D008297:Male; D011019:Pneumonia, Mycoplasma / Q000276:immunology / Q000517:prevention & control / Q000662:veterinary*; D013030:Spain; D013552:Swine; D013553:Swine Diseases / Q000276:immunology / Q000517:prevention & control*; D014611:Vaccination / Q000191:economics / Q000662:veterinary*; D015430:Weight Gain
D000907:Antibodies, Bacterial; D001428:Bacterial Vaccines