Study of anatomical, histological and cytological characteristics of the thymus of lambs

Abstract

Thymus of lambs of the Ouled-Djellal breed from eastern Algeria, aged one to 10 months, were used to study the anatomical, histological and cytological characteristics of these organs. Modern techniques have been used to demonstrate the morphometric parameters and masses of the thymus at different ages, a regression of the morphometric and mass indexes has been visualized according to the age of the lambs. Staining techniques with Hematoxylin and eosin revealed the normal structure of the thymus with its tissue components. The thymus is bilobed. The lobe is surrounded by a thin capsule and subdivided into lobules separated by septae, the cortical and medullary areas were clearly visible, the interlobular blood vessels enter the lobule in all its aspects to continue its way as interlobular blood vessels. From the changes observed in the involution of the thymus according to the age of the animals which occur relatively late, the percentage of the surface found for the capsule was very variable, which increases from the first to the tenth month, the demarcation of the cortex and the medulla beginning during the second month of age of the animal. The interlobular connective tissue (ILC) presents sums, the maximum of which was found in the fourth month of age of the animal, while the minimum was found in the thymus of ninth month lambs Concerning the Hassal corpuscles, their sums are in high extension until the tenth month, rich in T lymphocytes, whose use of immunohistochemistry, the anti-CD 157+ antibody allowed us to visualize to locate them clearly, which invade and form most of the thymus cortex. In conclusion, the significant changes in thymus development in sheep of the Ouled-Djellal breed are similar to those of other species.

Spleen Indices of Mixed Breed Rabbits Fed Graded Levels of some Common Forages in the Coastal Savannah Ecological Zone of Ghana

“…The body weight and spleen weight of 1926 to 2341g and 1.00 to 1.50g respectively obtained for rabbits in the present study were higher than the corresponding weights of 1350g and 0.55g recorded for 20-week-old local Algerian rabbits [12]. However, the spleen indices of 0.05 to 0.07 obtained for rabbits in the pres-ent study were lower than the calculated spleen index of 0.11 for the rabbits in the study by [12], resulting largely from the higher spleen weights of the rabbits in the current study. The good health exhibited by the rabbits throughout the experimental period resulted from the ability of their spleens in protecting them from invading pathogens [13].…”