RAT COLONY TESTING BY ZUCKER'S WEIGHT-AGE RELATION

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Abstract
A visual test of the "normality" of any rat colony may be obtained without appreciable expenditure of time and almost no numerical calculation by the use of Zucker''s observation that a plot on semi-log paper of log body wt. after weaning against the reciprocal of age should give a straight line. This was found to be true for 11 colonies, but not true for 1 colony in which a diet adequate for adult but inadequate for younger rats may have been given. This log-reciprocal relation is an easily applied index to test the operation of unsuspected variables and may be used as a measure of secular change in a colony.

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