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Heterotopic calcification in swine.

F Gilka, A H Corner, E A Sugden

Veterinary Pathology

|March 1, 1978

Summary

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Pigs developed abnormal calcifications in heart and stomach tissues during nutritional studies. These lesions suggest potential chronic vitamin D3 toxicity, warranting further investigation into swine nutrition and health.

Area of Science:

Veterinary Pathology
Nutritional Science
Biochemistry

Background:

Nutritional studies in pigs can reveal unexpected pathological changes.
Heterotopic calcification is a pathological process affecting various tissues.
Understanding enzyme activity is crucial for diagnosing metabolic disorders.

Purpose of the Study:

To investigate the cause of heterotopic calcifications observed in pigs undergoing nutritional studies.
To characterize the histopathological and biochemical features of these calcifications.
To determine the potential role of vitamin D3 in the observed pathology.

Main Methods:

Histopathological examination (light and electron microscopy) of calcified tissues.
Assessment of alkaline and acid phosphatase activity at calcification sites and other tissues.

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Serum and bone analysis for calcium and magnesium levels.

Main Results:

Pigs exhibited calcifications in the left atrial endocardium and gastric submucosa.
Microscopy revealed edema, connective tissue changes, calcium deposition, and inflammation.
No significant alkaline phosphatase activity was found at calcification sites.
Increased acid phosphatase activity was localized to macrophages in inflamed areas.
Serum and bone calcium and magnesium levels remained within normal ranges.

Conclusions:

The observed calcifications and associated inflammatory responses suggest a possible link to hypervitaminosis D3.
The findings highlight the importance of monitoring vitamin D levels in swine nutrition to prevent pathological calcification.