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Exogenous pigments 2
Tattoo
Carotenoid pigments Lipochrome pigments, not lipofuscin pigments. Sources: β-carotene and fat soluble phyto-pigments Grossly , the pigments are normally found in the cells like adrenal cortex, corpus luteum, Kupffer and testicular cells and in plasma/serum and fat of horses and Jersey cattle. The fat is discoloured to yellow to orange-yellow. Holstein cattle, sheep, goat and cats store little or no carotenoids in which fat is white and serum is clear. In starvation fat atrophy, the adipocytes become dark yellowish brown due to concentration of carotenoids. Microscopically , pigments are not seen due to dissolution of pigments by alcohol and clearing agents (Fat soluble nature). Tetracyclines Deciduous teeth or developing teeth and bone may show yellow or brown deposits if the animals are treated with tetracycline antibiotics. Plumbism Plumbism is deposition of lead in the body in chronic poisoning. Sources : Ingestion of lead containing grains, water, fodder, lead containing batteries, lead water pipes, etc., The lead sulphide (PbS) formed by hydrogen sulphide (H2S) and lead imparts “blue line” in the gum, along the edges of teeth and gray colour to faeces. Hydrogen sulphide is derived from the putrefaction of food particles. Argyria
Asbestosis
Siderosis
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