Abstract
This investigation was carried out on three categories of old birds including cage layers, game birds (ducks and pheasants) and free-range birds. During the study 137,918 carcasses were examined grossly at slaughterhouses and 2040 condemned carcasses underwent detailed post-mortem examination. A total of 419 of the condemned carcasses had nodular lesions. On histological examination of the nodular lesions, one case of bacterial granuloma in a free-range layer, two cases of parasitic granulomata in ducks, 337 cases of different types of tumours and 79 cases of miscellaneous lesions with a nodular appearance were diagnosed. Overall, there was a total condemnation rate of 1.5%. The prevalence of various types of nodular lesions was discussed.
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