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Single Weight Versus a Three-Day Average Weight for Sheep

University of Illinois

Abstract

Environment seems to play an important role in determining the three-day Average weight of sheep.

In these data there is no significant difference between the lot weights obtained on the first day and those obtained from the three-day averages.

The standard error of the mean is not invariably reduced by taking the mean of three daily weights. The greatest reduction for these data was .1 pound.

In this test the extra work involved in weighing on three consecutive days did not result in increased accuracy and therefore did not produce the results for which it was intended.

There seems to be no justification for continuing the practice of weighing an experimental animal on three consecutive days. One weighing, in which the scales are accurately read, usually will more nearly represent the actual weight of an animal than will the average of three weights taken at twenty four-hour intervals.