. Bulletin of the Department of Agriculture. Agriculture; Agriculture. UNITED STATES DEPARTMENT OF AGRICULTURE ^^m§- BULLETIN No. 1100 ^ jdh^% Washington, D. C. September, 1922 A METHOD OF DETERMINING IN WOOL. GREASE AND DIRT By D. A. Spencer, Senior Animal Husbandman in Sheep and Goat Investigations, J. I. Hardy/ Sheep Husbandman, and Mary J. Brandon, Scientific Assistant in Sheep and Goat Investigations, Animal Husbandry Division, Bureau of Animal Industry. CONTENTS. Page. Object of this investigation 1 Method of obtaining data 1 Experimental work 2 Index figures for grease and dir
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. UNITED STATES DEPARTMENT OF AGRICULTURE ^^m§- BULLETIN No. 1100 ^ jdh^% Washington, D. C. September, 1922 A METHOD OF DETERMINING IN WOOL. GREASE AND DIRT By D. A. Spencer, Senior Animal Husbandman in Sheep and Goat Investigations, J. I. Hardy/ Sheep Husbandman, and Mary J. Brandon, Scientific Assistant in Sheep and Goat Investigations, Animal Husbandry Division, Bureau of Animal Industry. CONTENTS. Page. Object of this investigation 1 Method of obtaining data 1 Experimental work 2 Index figures for grease and dirt 2 Basis of the index figures 5 Conditioning for weighing 6 Experimental work.—Continued. Determining weight of grease , Determining weight of dirt Weekly working schedule E xplanation of wool-scouring data slieet, Summary Page. 11 15 15 19 20 OBJECT OF THIS INVESTIGATION. The object of the wool-scouring investigation, here discussed is to afford a fair basis for comparing the grease and dirt indices of va- rious wools, the indices to be used to divide wools into groups for the study of other qualities affected by or associated with grease and dirt contents, such as length of fiber, fineness, density of fleece, spin- ning quality, strength, and weight of clean wool per fleece. Data obtained are to be used in planning the mating of the sheep that grow the fleeces studied for the purpose of fleece improvement in the qualities mentioned. METHOD OF OBTAINING DATA. Sheep-breeding investigations conducted by the Bureau of Ani- mal Industry, United States Department of Agriculture, involve extensive studies in fleece improvement. Individual fleeces of about 2,000 sheep are studied each year, and the problem of obtaining data on the net yield of clean wool from each fleece has prompted the development of a method of single-fleece determination that would yield dependable results without necessitating the complete 1 Moisture experiments reported in this bulletin were conducted by J.
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