Reproduction in the mammal presents special problems in nutrition. Not only must the requirements of the maternal organism be met, but the development of the fetus makes added demands on the supply of those substances from which the new tissue is formed. Whereas, at 28 weeks, the fetal content of calcium is approximately 5.4 Gm., at 40 weeks it has increased to almost 31 Gm. In spite of this storage of material, studies on various experimental animals and on man indicate that a positive balance of calcium, phosphorus and nitrogen is likely to be found during pregnancy. In other words, the usually observed augmented intake of food provides for the added demand of the fetus. After parturition, however, when vigorous flow of milk sets in, a considerable loss of certain essential materials in the milk occurs. This applies especially to calcium and phosphorus. The magnitude of this loss through the
NUTRITION AND MILK PRODUCTION. JAMA. 1932;98(23):1992. doi:10.1001/jama.1932.02730490038012
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