Resumo

COLAS CHAVEZ, M; MERINO GARCIA, N; ESPINOSA, Ivette  e  RELOVA, Damarys. Heterotopic hematopoiesis in ossified rings of the trachea of laying hens affected by the chronic respiratory syndrome. Rev Salud Anim. [online]. 2012, vol.34, n.3, pp. 192-195. ISSN 0253-570X.

In a randomized study carried out in Cuba in laying hens and their replacements affected by the chronic respiratory syndrome (CRS), tracheas of 65 hens, 48 replacement and 30 without apparent clinical changes, were sampled. The samples were processed by conventional histology. As an unexpected finding the ossification of the hyaline cartilage of the trachea (OHCT) and the presence of bone marrow in the ossified nuclei were observed. This was confirmed by Giemsa staining where myeloblastics and erytroblastics cells could be identify. Taking into consideration the relationship between the respiratory failure and the OHCT with heterotopic hematopoiesis in both categories, the following hypothetical mechanisms can be established : birds could establish an adaptation from Hb to the chronic hypoxia to the hematopoiesis formation in the OHCT, as a compensatory mechanism against the chronic hypoxia caused by the respiratory failure, besides existing a close relationship between osteoblasts (OHCT) and the heterotopic hematopoiesis.

Palavras-chave : bone marrow; ossification; laying hens; trachea; CRS.

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