Gross and Histopathological Study on Pneumonic Lungs of Small Ruminants Slaughtered at Different Restaurants and Modjo Export Abattoirs, Ethiopia
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2020-06
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Abstract
Cross sectional study designed to attain the objectives to characterize gross and microscopic lesions in pneumonic lung of small ruminants was conducted from October, 2019 to May, 2020. Totally 155 lungs (sheep = 86) and (goats = 69) were examined from export abattoirs and different restaurants in Modjo town during the study period. Out of which 107 (69.03%); 60 (69.8%) and 47 (68.12%) in sheep and goats, respectively, had displayed different types of pneumonia. Suppurative bronchopneumonia (45%) was the most frequent followed by interistitial pneumonia (21.5%), fibrinous bronchopneumonia (10.3%), granulomatous pneumonia (9.35%), verminous pneumonia (6.54%) aspiration pneumonia (4.67%) and embolic pneumonia (2.8%). Bronchopneumonia, both suppurative and fibrinous were grossly characterized by lungs consolidation commonly on the cranioventral area, however; fibrineous type was characterized by typical fibrin deposits while the suppurative type was characterized by suppurative exudates. The common microscopic characteristics were fibrin strands in fibrinous bronchopneumonia and massive neutrophils in suppurative bronchopneumonia. Interistitial pneumonia was typically identified grossly by prints of coastal ribs at the surface of lung and its rubbery texture on palpation and by proliferation of smooth muscle and slightly presence of edema in the alveolar interistitium microscopically. The gross appearance of verminous pneumonia was similar to interistitial pneumonia however, the cut surface reveal parasites both grossly and microscopically. The granulomatous pneumonia was recognized by the presence of nodules grossly and cellular granulomatous rim, a zone of layers consists of various inflammatory cells and few fibrosis in outer layer microscopically. Immunohistochemistry results revealed that the alveolar and peribronchiolar surface infiltrated macrophages were expressed CD45 and CD68 immunopositive reaction. Aerobic bacterias commonly Staphylococcus aureus, Streptococcus spp., Escherchia coli and Pasteurella spp. were isolated; and parasites commonly Dictyocaulus filarial, Mulleries capillaris and Protostrongylus rufescens were identified from pneumonic lung tissues. It could be concluded that pneumonia was one of the problem of small ruminants at abattoirs. Large number of aerobic bacterias and parasites were identified. Although no doubts that the parasites isolated were the causes of pneumonia from which they isolated, and
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it was exactly while the animals were at the field for the bacterias isolated causal relationship should be done at the field.
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Abattoirs, Ethiopia, Gross and histopathological lesions, mmunohistochemistry, Pneumonia, Restaurants, Sheep and goats