دراسة نسيجية لجلد الأغنام المحلية Ovis ovis

الملخص EN

The research was including histological study of the skin of local breed sheep (Awassi).

The study carried out by using ten adult healthy skin rams specimens were taken during Autumn season from (12) different anatomical regions involving (ventral and dorsal surfaces of ear, neck, middle of back, scrotum, anterior and posterior ends of tail, medial and lateral surfaces of thoracic and pelvic limbs and muzzle).The histological results revealed that the epidermis was thin in most anatomical regions and composed of four secondary layers arranged from the inner to the outer larger as: stratum basale, stratum spinosum, stratum granulosum and stratum corneum.

Results were found, presence of thick epidermis in muzzle and posterior end of the tail and it was characterized by presence of stratum lucidum beside the mentioned four layers.

The mean thickness of the epidermis reaches 250.30 um in the muzzle region while the epidermis of the ventral surface of the ear was the least and reaches 45.25 um.

In general, we observed that was a direct relation between the whole thickness of the epidermis and the thickness of the stratum corneum in all of the studied skin regions, the results revealed that the dermis of Awassi sheep composed of two essential layers: The superficial called papillary layer, and deep reticular layer.

The histometric results refers to that the highest mean thickness (2520.70) um of the dermis was observed in the posterior region of tail, and least thickness(570.20) um in the skin of the ventral surface of ear.

Two types of wool follicles in the dermis also noticed; the primary wool follicles, and the secondary wool follicles.