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Mineral and trace element content of cattle hair as an indicator of supply calcium, magnesium, phosphorus, potassium, sodium, iron, zinc, manganese, copper, molybdenium and cobalt. 4



Mineral and trace element content of cattle hair as an indicator of supply calcium, magnesium, phosphorus, potassium, sodium, iron, zinc, manganese, copper, molybdenium and cobalt. 4



Arch Tierernahr 16(2/3): 199-213



Until the 140th day of age the average daily uptake of Fe in experimental calves was 104 mg and 59 mg, respectively. No differences were observed in the Fe content of the liver, kidney and spleen of these calves. With a low Fe supply the proportion of Fe in muscles, hair, bones and blood was reduced. Daily doses of 2.2 mg Cu per calf resulted in Cu deficiency signs (gnawing disease) and decreased weight gains after the calves had reached the age of 70 days. Until 140 days of age 7.7 mg per calf/day were sufficient to meet the Cu requirements. The low Cu diet reduced the Cu supply in the liver to an average value of 17.6 ppm. Variations in the Cu uptake were best indicated by the percentage of Cu contained in the liver. Similarly, significant differences in the Cu content were observed in the kidneys, the blood and the hair, in the order stated. No such differences were found in other parts of the body. Daily amounts of 8.5 mg Mn were insufficient to meet the Mn requirements of calves. 36 mg Mn were found to be an adequate amount. In Mn deficient calves convulsive twitching of the tongue was observed from about the 110th day of age onwards. At this stage a walking disability of the calves was beginning to appear. Swellings on the tarsal joints of the forefeet were observed accompanied by muscular tremor and stiffness of the forelimbs. The degree of Mn supply is best indicated by the Mn content of the hair, incompletely indicated by the amount of Mn found in the bones, the kidney and the liver, and not indicated in the blood, spleen and muscles.

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