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Mineral Balance Studies with the Baby Pig: Effects of Dietary Vitamin D₂ Level upon Calcium, Phosphorus and Magnesium Balance^1,2,

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.