Influence of Lactose and Glucose on Magnesium-28 Retention in the Chick

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Abstract
The utilization of orally or intraperitoneally administered 28Mg was studied in chicks fed diets containing 300 ppm magnesium and either glucose or lactose (25% of diet) plus glucose as carbohydrate sources. No significant influence of the dietary carbohydrate was observed on the retention of orally or intraperitoneally administered 28Mg in the whole chick. Radioactivity in the blood at the initial withdrawal and in the femur at the termination of the experiments, however, indicated an increased concentration of 28Mg in these tissues for chicks fed lactose in their diets. These differences were statistically significant only for chicks receiving the isotope by oral administration. The radioactivity in the blood and femur of chicks given intraperitoneal injections of 28Mg was not significantly altered by the source of carbohydrate, although these values were higher for birds fed lactose in their diets. Lactose, in addition to its influence on increased feed consumption and hemoconcentration which were previously reported, appears also to exert a stimulatory influence on magnesium absorption in the chick.