Do you find Dictyocaulus filaria in lungs of small ruminants. Which can be one of the causes. Rest it can be bacterial, will soon come back to you. please give me your email .
Retrospective Study of Disease Incidence and Type of Pneumonia in Nigerian Small Ruminants in Ibadan, Nigeria by Emikpe B.O, Jarikre T.A and Eyarefe O.D in Afr. J. Biomed. Res. Vol.16 (May 2013); 107 - 113. (link: http://www.bioline.org.br/pdf?md13014)
Histopathological study and pulmonary classification of bovine lesions by M. Belkhiri, M. Tlidjane, Y. Benhathat and T. Meziane in African Journal of Agricultural Research Vol. 4 (7), pp. 584-591, July 2009. (link: http://www.academicjournals.org/journal/AJAR/article-full-text-pdf/F94645134879)