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Comparison of Methods of Measuring Crimp in Grease Wool Staples¹

U.S. Department of Agriculture, Beltsville, Md. 20705

Abstract

Information was obtained on measurement of crimp in grease wool staples, using duplicate samples from two locks from three regions on Merino and Shropshire sheep. The study was designed to obtain information on lock differences and operator differences, and to compare three methods of measuring crimp.The number of crimps per centimeter was obtained by three methods: (1) placing a ruler alongside the staple and counting the crimps; (2) projecting and drawing the crimps, with subsequent measurement of width and depth and calculation of number of crimps per centimeter and width/depth ratio; and (3) projecting and measuring the crimps with a crimp scale to obtain width/depth ratio and number of crimps per centimeter.

Analyses of the results obtained by all three methods for the two breeds indicated that the different methods were fairly consistent in ranking regions on the sheep, levels on the lock and sheep for width/depth ratio and number of crimps per centimeter. To measure width/depth ratio of crimp, more than one location, level and subsample should be used for individual sheep.

¹ The authors wish to acknowledge the help of B. F. Gadsden, Jr., who carried out the bulk of the experimental measurements, and Ruel L. Wilson for assistance in the final analyses of the data.

² Animal Science Research Division, A.R.S., Beltsville, Maryland 2O7O5.

³ Formerly Biometrician, Livestock Research Staff, B.S.S., A.R.S., Beltsville, Maryland. Present address, Department of Dairy Science, Ohio State University, Columbus 43210.