J. Anim Sci.
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J. Anim Sci. 1954. 13:229-233.
© 1954 American Society of Animal Science
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A Meter for Studying Quantitative Wool Differences among Sheep1

Wm. D. McFadden and P. E. Neale2

New Mexico Agricultural Experiment Station

Abstract

An appraisal of wool density is necessary to improve predictions of shearing ability for individual sheep both for selection of individuals and estimation of shrinkage. For this purpose, a density meter has been developed to show differences in amount of covering between individual animals.

Working with a group of sheep at the New Mexico Agricultural Experiment Station, two operators made independent observations with the new device. Individual sheep were measured on two separate occasions by both operators to test the repeatability of the instrument.

Each operator measured highly significant differences between sheep, with negligible differences between observations, thus indicating high repeatability for the instrument. Differences were noted between operator readings, but percentage computations of components of variance showed these differences to be smaller than between sheep variance.

Sampling of individual areas showed little to choose among hip, side, or shoulder measurements. Because of the ease of locating a specific area on the hip, this spot for measurement is preferred.

Simple correlation and partial regression coefficients showed that there was a highly significant relationship between density machine readings and clean wool production.

Footnotes

1 Journal Series No. 81, New Mexico Agricultural Experiment Station, State College, New Mexico.

2 Assistant in Agricultural Economics and Animal Husbandman, New Mexico Agricultural Experiment Station, respectively.






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Copyright © 1954 by the American Society of Animal Science.