Abstract
Summary
DNA content of mammary glands of rats lactating 41 or 61 days was not significantly different from that of glands of rats lactating 21 days (10.56 mg and 10.94 mg vs 11.03 mg). RNA content of mammary glands of rats lactating 41 or 61 days was highly significantly less than that of glands of rats lactating 21 days (49.76 mg and 44.83 mg vs 75.06 mg). Similarly, body weight gains of foster litters were less than those of original litters.
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