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The Influence of Location and Size of Sample in Predicting Whole-Fleece Clean Yields

United States Department of Agriculture

Abstract

THE amount of clean wool produced by individual sheep is of primary importance in breeding for greater wool production. Scouring whole fleeces requires considerable equipment, labor and time; hence laboratory techniques for scouring wool samples of 200–250 gms. were developed by Spencer et al. (igeS), Wilson (1928), Burns (1930), and Hardy (1934). Davis et al. (1938) and Schott et al. (1942) reported that smaller samples of wool (25–35 gms.) from the shoulder and side, respectively, gave accurate estimates of the clean yields of whole fleeces. Pohle, Wolf and Terrill (1943) and Pohle and Hazel (I944) investigated clean yield in 8 different parts of the fleece in an attempt to determine the most accurate sampling locations. Differences in average clean yields of the various parts~were clearly evident and locations along the topline (withers, back and rump) gave less accurate estimates of clean yield in whole fleeces than the remaining locations.

In the present study, half, fleeces were separated into a predetermined number of small samples in order to compare clean yield of the various samples with that of the intact half-fleece.

¹ U. S. Sheep Experiment Station and Western Sheep Breeding Laboratory, Dubois, Idaho.