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Variation in Determinations of Digestive Capacity of Sheep¹

The Pennsylvania State College

Abstract

In a study of variation in determinations of digestive capacity of sheep, 22 yearling Merino wethers were used as subjects in a digestion experiment with clover-timothy hay as the only feed.

The standard deviation of the values determined for digestibility of the nutrients of the hay were reasonably low except with reference to lignin as determined by difference.

A table is presented giving the standard errors and the minimum difference required between determinations with one to ten sheep for odds of significance of 19 to 1.

While the number of sheep required per experimental treatment depends on the permissible variability of results, it is concluded that five sheep per treatment are a sufficient number for usual purposes if the experimental technic is efficient, and if the sheep have been successfully treated on account of parasites of the alimentary tract.

¹ Authorized for publication on February 3, 1945 as paper no. 1272 in the Journal Series of the Pennsylvania Agricultural Experiment Station.