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Departments of Animal Husbandry and Biochemistry, Michigan State University, East Lansing, Michigan
Calcium, phosphorus and magnesium balance studies were conducted with baby pigs receiving a purified casein-glucose diet containing levels of vitamin D2 of zero, 100, 500 and 1000 IU/kg. Pigs receiving no dietary vitamin D2 excreted an excessive amount of fecal Ca, P and Mg but a reduced amount of urinary Ca and Mg. Retention of Ca, P and Mg was greatly reduced in vitamin D2-deficient pigs. A dietary vitamin D2 level of 100 IU/kg produced a normal Ca, P and Mg balance which was not increased by higher levels of dietary vitamin D2. Increasing dietary Mg in one trial increased Mg retention in pigs receiving vitamin D2 but did not affect Ca and P balance.
2 Presented in part before the meeting of the American Institute of Nutrition, April, 1963 (Federation Proc., 22: 491, 1963, abstract).
Manuscript received 18 September 1964.
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