Abstract
Bovine tuberculosis (bTB) caused by Mycobacterium bovis is one of the most important zoonotic disease that poses huge economic losses in livestock population worldwide. A cross sectional study was therefore designed to investigate its prevalence and efficacy of meat inspection procedures for its detection in slaughtered cattle at two abattoirs of Karachi. A total 2000 were examined during March 2015 to September 2016 in which 943 animals were found suspected for bTB and necropsied from which 1170 organ samples were collected. The data collected was analyzed using Chi-square test. Results of regular and complete examination revealed that 8.12% organ samples had positive lesions of tuberculosis. The highest frequency of lesions were observed in lungs and its associated lymphnodes (64%) i.e. mediastinal lymphnodes (27%), tracheobronchial lymphnodes (26%), lungs (11%) respectively. There was a significant difference (P < 0.05) in prevalence of bTB amongst sex of cattle. Females were found at high risk of bTB. It was concluded from the results that however bTB is highly prevalent in cattle and sensitivity of inspection protocols may influence reporting positive cases. Thus it is suggested that more advanced and sensitive methods should be used for screening of tuberculosis in cattle population. Keywords: Bovine tuberculosis; Meat inspection; Prevalence and Pathological lesions http://dx.doi.org/10.19045/bspab.2019.80134
Highlights
2000 were examined during March 2015 to September 2016 in which 943 animals were found suspected for bTB and necropsied from which 1170 organ samples were collected
Bovine tuberculosis is caused by Mycobacterium bovis
Following the procedure of preslaughter examination of animals and examination carcass and visceral organs the data were collected for presence of lesions of bTB to calculate the prevalence of tuberculosis in cattle
Summary
Distribution of bTB lesions in different organs of slaughter cattle is given in Amongst the organs examined for lesions of bTB, the highest number were recorded in mediastinal, 27.0 percent followed by tracheobronchial i.e. 26.0 percent 11.0 percent lungs, 9.0 percent medialretropharyngeal and mesenteric lymphnodes each, 5.0 percent liver and prefemoral lymphnode each and 4.0 percent mandibular and prescapular lymphnodes were having positive lesions of bTB (Plate 4). Frequency of tuberculosis lesions in different organs of cattle examined are shown in (Figure 2). The results indicated that frequency of lesion is highest in tracheobronchial lymph node 30.0% followed by mediastinal lymphnode i.e. 26.0%, lungs 11.0%, 9.0% mesenteric lymphnode, 8.0% medialretropharyngeal lymphnode, 6.0% prescapular lymphnode, 4.0% mandibular lymphnode and 3.0% each prefemoral and liver.
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