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Effects of Malnutrition in Early Life on Subsequent Growth and Reproduction of Rats¹

Department of Agricultural Biochemistry, Institute of Agriculture, University of Minnesota, St. Paul

1. Rats whose early growth had been severely inhibited by malnutrition during infancy were realimented after weaning by ad libitum feeding of a ration which supports good growth.

2. The weight increment of stunted young rats during the first 6 weeks of realimentation was about 80% of that attained by animals of the same strain whose early growth had not been retarded.

3. During the second 6-week period of realimentation, the growth of male rats was severely retarded.

4. Many of the male rats reached a subnormal stationary weight and were apparently permanently stunted as a result of malnutrition during the first 4 weeks of life.

5. Male rats whose early growth had been restricted for 20 weeks made only an incomplete recovery during realimentation.

6. After realimentation female rats whose growth had been retarded during infancy showed no impairment in their reproductive performance. The survival and preweaning growth of their young was normal.

Manuscript received 18 October 1954.