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Journal of Dairy Science Vol. 40 No. 9 1174-1180
© 1957 by American Dairy Science Association ®
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Variations of Scores among Different Characteristics of Holstein Cows for Herd-Type Classification1

C. J. Wilcox, K. O. Pfau and J. W. Bartlett

New Jersey Agricultural Experiment Station, Sussex

ABSTRACT

This investigation compared the different points on the score-card for classifying Holsteins over a five-year period and determined the uniformity with which they were rated by different inspectors. With over-all ratings, 26.16% of the total variation was due to variations among inspectors and the percentage was greater for all other characteristics. Average correlation between over-all ratings was +.69. General appearance, rump, and body capacity were more uniformly rated than the mammary system, dairy character, and feet and legs. Consistency of ratings varied widely for the different characteristics. Editor.

In herd-type classification work, not all characteristics of the animals, as listed on the simplified score-card, can be judged, evaluated, and scored with the same efficiency and consistency. The object of this investigation, therefore, was to identify and compare the different characteristics according to the degree of uniformity and efficacy with which they could be rated under practical conditions.

A number of studies in the past have shed some light on the subject.

FOOTNOTES

1 Paper of the Journal Series, New Jersey Agricultural Experiment Station, Rutgers University, the State University of New Jersey, Department of Dairy Industry, New Brunswick. This study is a part of a joint project in progress between the Holstein-Friesian Association of America and the New Jersey Agricultural Experiment Station.






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Copyright © 1957 by the American Dairy Science Association ®.