Abstract
Weanling rats were maintained for either 8 or 11 weeks on purified diets containing normal (0.0047%) and high (0.424%) zinc concentrations. These levels of zinc were associated with either normal (0.56%) or low (0.03%) calcium in the diet. The zinc content of the femora and of the incisor dentine and enamel was determined polarographically and the ash content of the femora and dentine was also measured. Both calcium deficiency and excessive intake of zinc significantly increased the concentration of zinc in bone and dentine while a similar trend was observed in enamel. The high zinc diets depressed the ash content of bone and raised that of dentine, this effect being more significant at the normal level of dietary calcium.
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