Abstract
In order to evaluate the role of mitochondrial calcium uptake in intestinal calcium absorption, the effect of adaptation to dietary calcium deficiency on the in vitro uptake of calcium by isolated duodenal mitochondria was studied. Experiments were performed utilizing 28-day-old cockerels which had received a diet adequate in vitamin D3 and phosphate and containing either 0.08% or 1.20% calcium. Mitochondrial 45Ca uptake from chicks deprived of dietary calcium was not significantly different from controls. These results suggest that increased calcium uptake by intestinal mitochondria is not crucial for adaptation to a low calcium diet.
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