RESUMO
A flock of 3-week-old broiler chickens fed with antibiotic-free commercial feed developed cyanotic combs, depression, extended abdomens, reddened abdominal skin, faeces-stained vents, and diarrhoea. By the end of week 6, mortality reached 19.3%, and important lesions seen were ascites, airsacculitis, swollen/congested kidneys, fibrinous perihepatitis, fibrinous pericarditis with or without hydropericardium, haemorrhagic enteritis-typhilitis and ballooned caeca. Salmonella typhmurium var Copenhagen and Escherichia coli were isolated from livers, hearts, intestines and caeca. Histomonas spp. were detected only in caeca. Thus, concurrent occurrence of salmonellosis, colibacillosis and histomoniasis was diagnosed.
RESUMO
The effectiveness of an oil adjuvant vaccine (OAV) incorporating locally isolated strains of Pasteurella haemolytica type 7 and Pasteurella multocida types A and D was compared with that of Carovax (Wellcome Laboratories) in imported cross-bred lambs. The criterion of efficacy was the ability of the vaccines to reduce the extent of pneumonic lesions in vaccinated as against unvaccinated control lambs. The OAV produced at this Institute significantly reduced the lung lesions at P less than 0.05 level compared with its control group when challenged with P. haemolytica alone. However, the vaccine was unsatisfactory against P. multocida or combined P. multocida P. haemolytica challenge. Carovax did not produce any significant reduction in the lung lesions caused by P. haemolytica and/or P. multocida.
