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Single Weight Versus a Three-Day-Average Weight for Swine

University of Illinois

Abstract

The deviation between the first-day weight and the three-day average increases as the size of the pig increases because the heavier pig usually has a higher average daily gain than the smaller pig.

Apparently the excitement created in handling the animal on the first day has considerable influence on the second-day weight, and this condition is reflected in the three-day average.

There is usually less variation in first-day weights than in the second or third or in the average of the three weights. Such being the case, errors are actually introduced into the results instead of ruling them out by using a three-day average.

Finally, statistical analysis of these data has failed to show any advantage in continuing the practice of obtaining a three-day-average weight rather than a single weight at the beginning and again at the end of a feeding experiment. The author recommends careful weighing on one day so as to avoid frequent errors in weighing and in reading scales, and the discontinuance of the practice of taking weights on more than one day.