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Development and Application of Ultrasonic Methods for Measuring Fat Thickness and Rib-Eye Area in Cattle and Hogs¹

Cornell University,^,4 Ithaca, New York

Abstract

An ultrasonic technique was developed and used to produce cross-sectional outlines of the rib-eye and associated fat at the 13 th rib of cattle and hogs. The procedure varied with development of technique and instrumentation from individual recording and plotting of reflected signals from numerous probings to a mechanized scan with one resulting photographic display. Since the procedure and data varied for different groups the data were treated in eight groups containing a total of 327 cattle and one group of 42 hogs.

Correlation coefficients for ultrasonic and carcass fat thickness measurements were lower in most cases than those reported by other workers since the 1.0 me. frequency was used to obtain greater penetration. Comparison of ultrasonic rib-eye areas with carcass rib-eye areas gave significant but low correlation coefficients. These relationships were higher for hogs than for cattle.

Comparison of repeated ultrasonic measurements indicated a significant repeatability of the method. Limited data suggest that the positional variation of rib-eye area and fat thickness between the 12 th and 13 th ribs, changes of shape and size of the rib-eye due to slaughtering, hanging and variability in pressure of the transducer against the hide during probing, are probable factors accounting for low relationships between ultrasonic and carcass measurements. The results of these investigations warrant additional refinement of the described technique in order to increase resolution and simplify evaluation of the results.

¹ The authors acknowledge Sperry Products, Inc., Danbury, Conn, and Branson Instruments, Inc., Stamford, Conn, for providing the ultrasonic equipment used in these studies. Special acknowledgment is due to the Beef Cattle Research Foundation, Inc., administered by the American Hereford Association, Kansas City, Missouri, Oscar Mayer and Co., Madison, Wis. and Armour and Co., Chicago, 111. who gave financial support for this research; Mr. Harold Kramer, General Electric Advanced Electronic Center, Ithaca, N. Y., for advice and construction of a portion of the equipment and the Ohio State University, Kansas State University, Texas A. & M. College and Cornell University, Animal Husbandry Depts. for providing animals and for cooperation in obtaining much of the data.

² Present Address: Animal Sci. Dept., Purdue University, Lafayette, Ind.

³ Present address: Institute für Tierzucht, Universität Göttingen, Germany.

⁴ Department of Animal Husbandry.

This article has been cited by other articles:

				F. R. B. Ribeiro, L. O. Tedeschi, J. R. Stouffer, and G. E. Carstens Technical note: A novel technique to assess internal body fat of cattle by using real-time ultrasound J Anim Sci, March 1, 2008; 86(3): 763 - 767. [Abstract] [Full Text] [PDF]

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