Growth ... : a measure of good nutrition : rats are used for nutrition studies because they will eat the same foods we do and quickly show the effect of good and bad diets ...
Nutrition chart, no. 1
United States. Bureau of Human Nutrition and Home Economics.
Washington, D.C, Bureau of Human Nutrition and Home Economics, U.S. Department of Agriculture, 1946
"U.S. Government Printing Office: 1946--713108."
Show pictures of white rats of different ages and how they look when they reach a certain age.
Animal models in research
Rats as laboratory animals
Graphic no. 929
Find in a local library