Objectives: Detection of infectious rate and observation of histopathological changes due to nymph of Linguatula serrata on liver and lungs of cattle, sheep and goat during different seasons of year.
Design: Slaughteral survey and preparation of histopathological sections from liver and lung.
Animals: In this study 420 cattle liver, 420 cattle lung, 480 sheep liver. 480 sheep lung. 480 goat liver and 480 goat lung (totally2760 sample) were examined.
Procedure: 2760 sample of liver and lung of cattle, sheep and goat were provided from different East Azarbaijan slaughterhouses during one year. Nymphs of linguatula serrata were obtained by digestion method. Also histopathological sections from infectious zone of liver and lung were prepared and stained by Haematoxillin & Eosin method and were
observed by light microscope.
Statistic analysis: Chi-Square method was used for detection relationship between infectatious rate of liver and lung within different seasons of year.
Results: No infective nymph was observed in liver and lung of cattle during this study .The nymph of linguatula srrata were observed in 98 (20/41%) sheep liver and 96(20%)sheep lung and 173(6/04%)goat liver and 170(35/41%) goat lung.
On sheep minimum infectious rate was observed during spring and maximum rate was observed during autumn. On goat minimum infectious rate was observed during winter and maximum rate was observed during autumn. Infectious rate variations in different season were significant (P<0/05). Histopathological studies appeared lymphocyte and macrophage cell infiltration into liver parenchyma, hemorrhage in Parenchyma of lungs, hyperemia, neutrophil and mononuclear cell infiltration into alveoli.
Conclusion: Results of this survey showed that there is
linguatula serrata infectious in East- Azarbaijan
slaughterhouses and variation between infectious rate of liver and lung of sheep and goat in different season was significant (P<0/05). J.Fac. Vet.Med.Univ.Tehran. 60,2:161-165,2005.
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