ABSTRACT: The ultrastructural examination of the testicular interstitial tissue of Egyptian
dromedary camel was performed to observe the seasonal changes. The activity of the
interstitial tissue increased largely in spring. This was indicated by the large number
of mature Leydig cells and two to three layers of myofibroblasts around the basal
laminae of the seminiferous tubules with large blood vessels in the interstitial tissue.
The testicular activity was moderate in winter as indicated by the lower number of
immature Leydig cells. The lowest activity was in summer when Leydig cells became
inactive with pyknotic nuclei. The cells of interstitial tissue lost their junctions with
each other, leaving large intercellular spaces and myofibroblasts transformed to
fibrocytes. The testicular activity began again to increase in autumn. The testicular
activity of camel, however, did not stop in any season of the year, because even in
non-breeding seasons a part of the interstitial tissue of the testis was active
Pak Vet J. 01/2012; 32(1-32(1)):65-69.