The objective of the investigations was to estimate the residual blood content in different pig organs and muscles in relation to the degree of bleeding. The residual blood content was evaluated by the measurement of the radioactivity of I¹³¹ isotope introduced intravitally before experimental bleeding. The following bleeding degrees were used: 100% i.e. a complete (maximal) bleeding, 50% and 0% i.e. a complete lack of bleeding. It was found that blood remained primarily in the internal organs of slaughtered animals: i.e.liver-12.9%, spleen -13.1%, lungs - 15.1%, heart - 7.4% and kidneys 15.7% of the tissue mass. The amount of residual blood increased significantly, especially in the internal organs in relation to the level of bleeding. A relatively small amount of blood, approximately 1.63% of the mass remained in muscles. The degree of bleeding significantly influenced the amount of blood remaining in particular muscles. In some muscles to a higher extent i.e. diaphragm - 2.23%, but in others less i. e. longissimus dorsi muscle - 1.12% blood remained. The residual blood in internal organs and muscles depended significantly on the degree of bleeding. With a complete lack of bleeding, the highest content of blood was noted in lungs 21.3%. In muscles the content of blood increased by 0.6% in the diaphragm and nearly by 0.05% in the longissimus dorsi muscle. The longissimus dorsi muscle constitute an exception because the content of residual blood in this muscle was not related to the degree of bleeding.
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