Authors: NURHAYAT GÜLMEZ, ŞAHİN ASLAN
Abstract: The present work was undertaken to show the histological structure and histometrically features of thymus and bursa of Fabricius of native geese. The general histologic structure of bursa of Fabricius was similar to the structure of many other birds stated in literature. By histometrical measurements, it was determined that the mean thickness of cortex and medulla of the lymphoid follicles in plicae were 89.06±3.23 ??and 196.8±3.08 ??respectively. The mean diameters of lympocytes in cortex were 4.54±0.08 ??while those of plasma cells were 6.36±0.33 ?. The mean diameters of lymphocytes in medulla were 4.49±0.08 ?, and that of plasma cells were 6.68±0.34 ?. In comparison of the diameters of lymphocytes in cortex with those of in medulla, it was seen that the statistical difference in both diameters was insignificant (p>0.01) while the diameters of the plasma cells were statistically significant (P<0.01). The general histologic structure of the thymus as the bursa of Fabricius was similar to other birds however there were also some differences. The number of lobes was found about 6-9 in right about 5-9 in left in geese. There was not any lobulation in the first cranial lobes. Plasma cells and myoid cells were located in cortex and medulla and myoid cells have diameters 13-33 ?. Hassal's corpuscles in the medulla had both vacuoles and laminated structures approximately at the same range. By histometrical measurements of thymus, the mean diameters of lymphocytes in cortex were 3.80±0.08 ??while those of plasma cells were 6.03±0.31 ?. The mean diameters of lymphocytes in medulla were 4.10±0.08 ?, and those of plasma cells were 5.83±0.31 ?. In comparison of the diameters of lymphocyters of lymphocytes in cortex with those of in medulla the statistical difference in both diameters was significant (P<0.01), but the difference in the diameters of plasma cells was statistically insignificant (P>0.01). In comparison of these two organs, the difference in both diameters of lympho cytes and plasma cells was statistically significant (P<0.01).
Keywords: Bursa of Fabricius, Thymus, Histology, Geese.
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