Week of 22-Sep-2017
What is the likely cause of this lesion seen in >10% of lungs in slaughter pigs each week from a breeder feeder farm?
The incised lesion shown is typical of a long standing infection with Actinobacillus pleuropneumoniae (App) infection in the diaphragmatic lobes of the lung. Pleural tags will be evident above the lesion.10% prevalence in weekly batches suggests enzootic disease within the herd and it is likely that it will be acting to limit performance and be part of a wider respiratory picture. Pleurisy levels at slaughter will also tend to be high with implications for trimming and carcass rejection.
Pasturella and Trueperella are both capable of producing abscessation in lungs but are typically secondary pathogens causing wet abcesses with lower prevalence. They are not typically associated with overlying localised pleurisy.
These dry lesions can surprisingly often yield cultures of App confirming the diagnosis.
Control of such disease at a herd level is best achieved by vaccination of young growing pigs either with a polyvalent commercial vaccine or using an autogenous vaccine derived from one or more isolates from the affected pigs.
Long term use of antibiotics to control chronic App infection on farm is no longer regarded as an acceptable option.
Week of 20-Sep-2018
Some gilts and sows have died suddenly during the last few months with no apparent clinical signs of disease. There is haemoperitoneum and splecnomegalia at post-mortem examination. What is the cause of mortality?
Week of 14-Sep-2018
Some finishing pigs are found with swelling of the tails with blood. What is the cause of it?
Week of 31-Aug-2018
A lactating sow is found with widespread raised rhomboid lesions on the skin. What is the most likely cause of this lesion?
Week of 24-Aug-2018
Dead pigs with cyanotic ears and lower and distal parts of the body are found in one room of a flat deck accommodation. Some pigs are alive but dope. What is the cause of this condition?
Week of 17-Aug-2018
A sow is reluctant to walk. At inspection of the foot, a claw is warm, painful and there is a crack. What is this lesion?
Week of 10-Aug-2018
An increase of “humpy-back” pigs from 6 to 8 weeks of age was detected in this unit afecting up to 5% of the feeding herd with irrelevance of the sex. What is the cause of this lesion?