Anatomical studies on the liver of adult Bakerwali and non- descript goats of Jammu region-A Comparative study
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Date
2021-03-04
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Sher-e-Kashmir University of Agricultural Sciences & Technology, Jammu (J&K)
Abstract
The study was conducted on 6 samples of liver and gall bladder of young (below 1 year), adult (2-3 years) and senile (4 years and above) Bakerwali and non-descript goats. Samples were subjected to gross morphology, biometry, histology, micrometry and histochemistry. Blood samples were collected from the same animals for determining various biochemical parameters and liver enzymes. Liver was almost rectangular, lobulated, reddish brown in colour. The liver of Bakerwali goat was more darker in colour. The gall bladder was a musculo-membranous pear-shaped sac having body and neck. Length of liver showed an increasing pattern with advancing age in both the breeds, although the Bakerwali goat had greater value in all age groups. The mean width was slightly less in non-descript goats at the level of UPOML.The mean values of thickness, weight, volume and shape index were slightly higher in non-descript goats irrespective of age groups. The length and width of gall bladder were higher in Bakerwali goats but thickness was more in non-descript goats. Histologically, the liver was covered by outer peritoneal layer and inner Glisson’s capsule. The capsule comprised of collagen, reticular fibres and smooth muscle cells in both the goats. The thickness of capsule was highest in adult group of non-descript goats. The capsule showed weak reaction for PAS, negative reaction for glycogen and weak reaction for lipids in both breeds of goats. Hepatic lobules, portal lobules and liver acinus were observed. Hepatic lobules were more easily recognized in Bakerwali goat as compared to non-descript goats where interlobular connective tissue was minimal. The number of liver lobules per field was significantly less in Bakerwali goats in all age groups (P≤0.05). Hepatocytes were polygonal epithelial cells with abundant eosinophilic, granular cytoplasm and centrally located round nuclei. Cytoplasm showed moderate reaction for PAS and glycogen and strong reaction for lipids in both breeds. Sinusoids were lined by endothelial and stellate marcophages (kupffer cells). Tunica mucosa of gall bladder was lined with simple columnar epithelium having mainly “light cells” with pale cytoplasm and few “dark cells” having dark and dense cytoplasm. The mean values of total protein, albumin, glucose and cholesterol were slightly less in non-descript goats as compared to Bakerwali goats and the mean values of ALP and GGT was significantly higher in Bakerwali goats. The mean values of LDH were higher in non-descript goat although statistically non-significant (P≤0.05).