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Fineness and Variability of Corriedale Lamb Wool¹

Colorado Agricultural Experiment Station

Abstract

SINCE the wool grade requirement for the American Corriedale sheep as defined by Hultz (1940) is a three-eighths blood fleece (56's spinning count) the selection of lambs in the replacement flock for wool of that quality assumes some importance. Fitness and uniformity have long been recognized as among the important factors in fleece evaluation, for both breeding and commercial criteria.

Many workers have concerned themselves with the development of techniques and devices for measuring fineness and variability in wool. Barker (1931) described the work of early investigators in this field. During the past twenty-five years, Hill (1922), Burns (1925), Duerden and Bosman (1926), Roberts (1927), von Bergen (1932, 1935, 1936), Schwarz (1934), Hardy (1935), Hardy and Wolf (1939), Granstaff (1940), Phillips et al. (1940), Pohle (1940), and Wollner et al. (1944) have contributed to the literature dealing with the methods of measuring fiber fineness.

Gorman (1931) measured composite samples of Corriedale wool with a machinist's micrometer caliper and reported a mean thickness value of .000952 inch for the fibers measured.

¹ Colorado Agricultural Experiment Station Scientific Journal Series Article 281.

² Wool Technologist and Research Statistician, respectively, Colorado A & M College.