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Histopathology and Cytology of
Poultry Diseases By Ivan Dinev, DVM, PhD
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VITAMIN A DEFICIENCY
Fig. 1. Transverse cross-section of the oesophagus, hen. In some instances, miliary grey-whitish thick nodules, prominating over the surface of the buccal mucosa, the oesophagus and the crop, could be observed. They are result of the occurring hyperkeratinization (h) and metaplasia (m) of the glandular epithelium. H/E, Bar = 35 µm.
Fig. 2. Hypovitaminosis А, pigeon. Hyperkeratinization of follicles of B. Fabricii mucous coat. H/E, Bar = 35 µm.
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