Author(s): Mohammed S. Al-Khalifa
Article publication date: 1989-04-01
Vol. 7 No. 1 (yearly), pp. 145-154.
148
Keywords
ovarian oocytes, sheep and goat ticks, eggs
Abstract
The development of ovarian oocytes of the sheep and goat tick Hyalomma arabica Pegram, Hoostraal and Wassef 1982, has been investigated by the light and electron microscope. Such studies revealed that the egg development could arbitrarily be divided into previtellogenic and vitellogenic stages distinguishable under the light microscope. The ultrastructural changes during egg development are described. Profiles of endoplasmic reticulum and Golgi complex are active in yolk synthesis. AS vitellogenesis proceeds, yolk precursors are incorporated into the egg by micro pinocytosis at the egg surface. Thus, in H. arabica, yolk materials appear to be derived from both intra- and extra-oocytic sources. The mitochondria and lipids are abundant. Other cytoplasmic components are illustrated