Clinical and Paraclinical Studies in Enzootic Pneumonia in Industrial Swine-Breeding of Bulgaria (original) (raw)
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Macedonian Veterinary Review, 2015
In the pig farm with signs of a respiratory disease complex and laboratory confirmed enzootic pneumonia, the prophylactic efficacy of the combination vaccine (M. hyo+PCV2), a single injection administered intramuscularly 21 days after birth, at a dose of 2 ml was tested. The clinical condition, pathological changes in the lungs and some epidemiological and economic results were reported. It was found that vaccinated pigs are in a better clinical condition in comparison with the control group. Morbidity in the rearing period was reduced from 16.3% in the control group to 6.0% in vaccinated pigs, and in the fattening period, respectively, from 30.6% in the control group to 10.0% in the vaccinated group. Pathological features in the lung characteristic for the enzootic pneumonia in the vaccinated pigs were reduced from 25.5%±7.24 to 4.0%±2.44, and PCVI - from 13.0%±4.66 to 0%. Vaccination of pigs has been received and a higher average daily gain in groups for rearing (0.624 kg) and for...
Journal of Comparative Pathology, 2010
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A National Plan for the Control and Eradication of Enzootic Pneumonia in Norwegian Swine Herds
Acta Veterinaria Scandinavica, 2003
We are often dealing with veterinary studies with very limited number of experimental units e.g. few animals. This might be due to complicated experiments, high cost for each animal, time demanding experiments, etc. All other things being equal, when the data set is small, it is difficult to demonstrate significant treatment effects. It is therefore of interest to improve the quality of data in order to demonstrate significant effects. On the other hand the choice of experimental design is also very important. Furthermore, the choice of analytical methods might also have some influence on whether or not an effect can be seen. Examples of small data sets will be given, illustrating the effect of high data quality. Different experimental designs will be discussed and the influence will be illustrated. Choosing exact methods for the statistical analysis, evaluating outliers or strange observations by influential statistics may improve the result as well.
Acta veterinaria, 2004
The efficacy of Respisure (Pfizer AH, USA), a vaccine against M. hyopneumoniae, was tested in pigs kept under good, moderate and poor housing conditions, respectively. The immune response, daily weight gain (DWG), lung lesions, and some parameters of meat important for production were examined. A total of 2.210 pigs from three different farms were used. One group of 1.105 piglets was vaccinated at the ages of 1 and 3 weeks. The second group of 1.105 piglets was used as a control. A total of 132 pigs were investigated in detail. ELISA (Enzyme-linked immunosorbent assay) showed that antibodies against M. hyopneumoniae were formed on day 28 after the second vaccination in all vaccinated pigs. In control groups on the farms with moderate and poor housing seroconversion to M. hyopneumoniae antibodies started at 49 and 91 days of age, respectively. Vaccination and housing conditions, taken separately, had significant effects on DWG and lean meat percentage (p <0.05). Vaccination was equally effective in all studied housing conditions (p = 0.93). Similarly, vaccination very significantly reduced lung lesions (p<0.0001). We conclude that Respisure is a highly effective vaccine against swine EP (enzootic pneumonia). We also conclude that it is equally effective in pigs kept under good and poor housing conditions.
Enzootic pneumonia: comparison of cough and lung lesions as predictors of weight gain in swine
Canadian journal of veterinary research = Revue canadienne de recherche vétérinaire, 1995
A prospective cohort study was undertaken in a commercial swine herd to determine the relationship between weight gain and the occurrence of enzootic pneumonia (EP). Estimates of the association between EP and weight gain were obtained from multiple linear regression models, using coughing episodes or slaughter checks as indicators of EP status. Models were estimated for pigs in 2 different age groups: roasters (n = 1084, sold at 32 to 50 kg) and market hogs (n = 1162, sold at 100 to 110 kg). The relationship between presence of lung lesions at slaughter and previous coughing episodes was also investigated. Throughout the study period, clinical evaluations were performed weekly, and coughing episodes recorded for each pig. Lungs were inspected at slaughter, and scores were expressed as the percentage of the lung with gross pneumonic lesions. Coughing and lung scores were significantly correlated, after adjusting for other covariates (R = 0.32 and 0.59, respectively, for market hogs ...
The Veterinary Journal, 2009
This paper explores the relationship between infectious and non-infectious herd factors with the occurrence of pneumonia at slaughter and productive parameters in fattening pigs on 39 fattening herds. A questionnaire was used to obtain environmental and management factors (non-infectious factors). Blood samples and lungs were obtained from 35 pigs in each herd at slaughter. Serological testing was performed for antibodies against three respiratory pathogens (infectious factors): porcine reproductive and respiratory syndrome virus (PRRSV), Mycoplasma hyopneumoniae (Mh) and Aujeszky's disease Virus-gE protein (ADV-gE). Lung lesion classifications were catarrhal-purulent bronchopneumonia (CPBP), pleuropneumonia (PLP) and pleuritis. A mean lesion value (MLV) was calculated for each lesion. ANOVA and logistic regression assessed statistical associations among MLV, average daily gain (ADG) and feed conversion ratio (FCR) (dependent variables) with infectious and non-infectious factors (independent variables). Mh vaccination was associated with a significant decrease in CPBP; high Mh seroprevalences was associated with an increased level of CPBP. FCR was negatively related with high seroprevalences for ADV-gE and Mh. No significant associations were seen for ADG.
Journal of Swine Health and Production, 2018
Histopathology and polymerase chain reaction were conducted on 81 lungs collected at slaughter from 13 swine farms free of porcine reproductive and respiratory syndrome virus and pseudorabies virus infection. Pasteurella multocida and Mycoplasma hyopneumoniae were the most common pathogens detected. Suppurative and catarrhal bronchopneumonia was present in 59 (72.8%) cases.
Animals
Although the prevalence of respiratory diseases in slaughter pigs ranges from 19% to 74% and continues to be an important concern for swine herds worldwide, only a few studies have investigated the relationship between respiratory disease and pork quality. The general aim of this study was to investigate associations between the prevalence and severity of enzootic pneumonia-like lesions in Polish slaughter pigs on different carcass and meat-quality characteristics at the animal and herd levels. The average prevalence of bronchopneumonic lungs with different degrees of lesions was 94.57%. The majority of lesions indicated the acute stage of enzootic pneumonia. Our results indicate a statistically significant interaction between the mean weight of carcasses depending on the extent of the lesions (p = 0.04) at the animal level. The correlation between meatiness and severity of lung lesions was r = −0.25 (p = 0.00). The correlation between the extent of lung lesions and pH45 value was r...
PloS one, 2015
Enzootic pneumonia (EP) caused by Mycoplasma hyopneumoniae has a significant economic impact on domestic pig production. A control program carried out from 1999 to 2003 successfully reduced disease occurrence in domestic pigs in Switzerland, but recurrent outbreaks suggested a potential role of free-ranging wild boar (Sus scrofa) as a source of re-infection. Since little is known on the epidemiology of EP in wild boar populations, our aims were: (1) to estimate the prevalence of M. hyopneumoniae infections in wild boar in Switzerland; (2) to identify risk factors for infection in wild boar; and (3) to assess whether infection in wild boar is associated with the same gross and microscopic lesions typical of EP in domestic pigs. Nasal swabs, bronchial swabs and lung samples were collected from 978 wild boar from five study areas in Switzerland between October 2011 and May 2013. Swabs were analyzed by qualitative real time PCR and a histopathological study was conducted on lung tissues...
Current Swine Respiratory Diseases Morphology in Intensive Swine Production in Serbia
Acta Veterinaria, 2020
Swine respiratory diseases represent one of the most frequent health issues in pig production worldwide. Despite the great progress that has been made in the field of diagnostics, control and prophylaxis, respiratory diseases still remain the most challenging health problem in modern commercial pig production. The list of infectious agents that cause respiratory diseases in swine is extensive and includes both, bacterial and viral pathogens. In Serbia, more than fifteen years after the introduction of modern vaccines, the list of bacterial pathogens related to swine respiratory infections still include Mycoplasma hyopneumoniae, Actinobacillus pleuropneumoniae, Haemophilus parasuis and Pasteurella multocida. On the other hand, most commonly involved viral pathogens are Porcine Reproductive and Respiratory Syndrome Virus, Swine influenza virus, Porcine circovirus type 2 and Pseudorabies virus. The morphological features of pneumonia where several agents are involved, depend on the pre...