食肉用動物組織中各種重金属含有量に関する研究
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概要
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The lean meat, heart, lung, liver, kidney cortex, kidney medulla, small intestine, and spleen from 20 cattle, 20 sheep, 20 swine, and 20 horses were examined for zinc, copper, manganese, nickel, chromium cadmium, lead, and arsenic. The fodders for cattle, swine, horses were also examined for zinc, copper, manganese and cadmium. This was done to discover the usual heavy metal values of edible animals with a view to determining whether age, breed, management, or feeding have any effect on the distribution of the metals in the animals, and to study the contribution by meat to the heavy metal uptake of man through food. The following results were obtained:<BR>1) Large amounts of most metals were found in the storage organs, liver and kidney.<BR>2) The cadmium contents in all the tissues of horses were 15-70 times as high as cattle, swine and sheep.<BR>3) In horses the observed ratios (metal contents in tissue/metal contents in fodder for each animal) of metal were definitely higher; the bovine livers having copper ratios of 9.5, and the livers and kidneys of horses having cadmium ratios of 26.5 and 277, i.e., 10-50 times as high as in other animals.<BR>4) The cadmium concentrations in the majority of tissues showed a tendency to increase with advancing age. Breed differences in the manganese concentration were noticed in cattle and horses.<BR>5) The mean lead and arsenic concentrations in all samples were less than 0.1μg/g wet weight, and lead levels in the liver and kidney of all animals were lower than in European animals.<BR>6) The meats were fit for human consumption with the exception of the liver and kidney of horses.
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