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Whole-Body Counting: A Study of the Count Repeatability and the Relationship between Weight and Adjusted Count¹

Oklahoma State University, Stillwater 74078

Abstract

Ninety-six steers representing two biological types (48 Hereford and 48 Charolais crossbred) were evaluated at four different weights to determine the relationships between live weight and adjusted count. Repeatability estimates between two separate counts (unadjusted) for the 227-, 317-, 408- and 499-kg weight groups were .96, .92, .94 and .97, respectively. A phantom system was used to remove variations in counting efficiency attributed to self-absorption and background depression. Analysis of variance indicated significant breed and weight groups effects (P<.01) for both adjusted count and fat-free lean. Crossbred steers had higher adjusted counts (1,191, 1,436, 1,642 and 1,822) at each of the four respective weights than did Hereford steers (1,010, 1,234, 1,493 and 1,650). A similar trend was noted for fat-free lean. Orthogonal polynomial comparison suggested that the response curve between weight and count was essentially linear, with linearity accounting for 99.4% of the weight group sum of squares.

¹ Journal Article 3363 of the Oklahoma Agr. Exp. Sta.

² Present address: Dept. of Anim. Sci. and Range Sci., New Mexico State Univ., Las Cruces 88003.

³ Dept. of Anim. Sci.