Influence for Distribution in Broiler Carcass of Minerals in the Feed
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概要
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Distribution of arsenic (As), fluorine (F), cadmium (Cd), lead (Pb), mercury (Hg) and copper (Cu) in the muscle, skin, liver, heart, kidney and feather of meat-type cnicks was determined after feeding experimental diets containing various levels of salts of these elements to one-day-old chicks for 8 weeks.Sensitivity limit of determination of As, F, Cd, Pd, Hg and Cu was 0.1, 1.0, 0.01, 0.1, 0.01 and 0.1ppm, respectively. Content of As, F, Cd, Pb and Cu in the basal diet mainly composed of yellow corn, soybean meal, fish meal and alfalfa meal was 0.1, 120, 0.06, 0.4 and 8.7ppm, respectively. Mercury was not detected in the diet.With the supplementation of As at the level of 7.9ppm or less, small amount of less than 0.36ppm was determined in the edible parts.Content of Cd and Cu in the edible parts of the chicks was proportional to the level in the diet. The highest value of Cd, i. e., 2.36ppm, was observed in the kidney and that of Cu, i. e., 5.62ppm, was observed in the liver of the chicks fed the diets with supplementation of the highest level of these elements, respectively.Only small amount of mercury, less than 0.02ppm, was found in the muscle, heart, gizzard and skin of the chicks fed the diet containg 0.49ppm or less of supplemented Hg.Content of Hg in the liver was slightly higer, being less than 0.06ppm. Content of Hg in the kidney seemed to be proportional to dietary Hg level, and to reach plateau at the dietary level higher than 0.13ppm.Content of the elements except Cd and Hg in the feather was much higher than that in the edible parts of the chiks. The highest level of As. F. Pb and Cu was 3.14, 24.6, 0.2 and 8.34ppm, respectively, in the feather of the chicks fed the diets containing high level of the elements. The highest level of Cd and Hg in the feather was 0.13 and 0.04ppm, respectively.
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