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Am J Physiol Endocrinol Metab 238: E26-E31, 1980;
0193-1849/80 $5.00
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AJP - Endocrinology and Metabolism, Vol 238, Issue 1 26-E31, Copyright © 1980 by American Physiological Society

ARTICLES

Mammary gland function and development: effect of zinc deficiency in rat

P. B. Mutch and L. S. Hurley

The effect of dietary zinc deficiency during late pregnancy and lactation on the rat mammary gland was investigated by feeding female rats either a zinc-deficient diet (0.4 ppm Zn) or a zinc-sufficient diet (100 ppm Zn) ad libitum or restricted in amount. Zinc deficiency from day 0 of lactation specifically reduced the total RNA content of lactating mammary glands on day 14, but had no effect beyond that of food restriction on their total DNA content, Both RNA and DNA content of the mammary gland were decreased by reduced food intake. Zinc deficiency from day 14 of pregnancy to day 2 of lactation severely impaired parturition and prevented the normal rise in mammary gland RNA seen during lactogenesis in control animals. A shorter deficiency period, from day 18 of gestation, had no effect on mammary gland nucleic acids other than that due to inanition.


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