Histomorphological developmental study of Liver and Gall bladder in local Awassi sheep

Abstract

ackground and Objective: Study the morphological, histochemical, histomorphometric and developmental statement of liver during
different stages of ages (prenatal and postnatal). Also study of comparative morphological and histological structure associated with
development of liver and gall bladder in local awasi sheep. Materials and methods: The study is performed on fifteen sheep fetuses,
provinces for prenatal study and twenty animals in different ages for postnatal study. All fetuses are weighing by using sensitive balance
and their crown-rump length (CRL) was measured by verniae calipers(Gall et al., 1994). (first trimester of gestation, and second trimester
of gestation) according to the gestational age, which is determined depending on the crown rump length (CRL) using of following formula
"( Y=2.74X+30.15)" "where 'Y'" is developmental "age of fetus" in days and 'X' is the "crown-rump length in cm. Results: at (50-55) days
of gestation the liver of sheep fetuses was a largest organ pinkish to reddish in color at the this stage , Histologically: present study revealed
that liver composed of thick capsule consists of collagen and reticular fiber . Current study appear that parynachyma of liver composed of
the hepatoblasts appear with large , basophilic rounded nuclei and very tightly. at (70-75) days of gestation the liver of sheep fetuses was
a largest organ in the body and smaller in size than the previous stage , reddish to brown in color at the color. Histologically: revealed thin
capsule contain collagen fibers . The fibers were also present continuously in portal area and were extending into liver parenchyma while
reticular fibers was present in the interlobular connective tissue and mesenchymal cells were present in the stroma. Conclusion: In case of
local awassi sheep fetuses at the first and second trimester the liver located at all the entire sub-diaphragmatic region , where its spans
larger area of the abdominal cavity and well developed histimorphologically at prenatal stage.