J. Anim Sci.
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J. Anim Sci. 1967. 26:1319-1324.
© 1967 American Society of Animal Science
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Periodic Measurement of Growth and Carcass Development following Diethylstilbestrol Implantation of Boars

R. F. Plimpton, Jr.2, V. R. Cahill, H. S. Teague, A. P. Grifo, Jr. and L. E. Kunkle3

The Ohio State University,4, Columbus and Ohio Agricultural Research and Development Center,, Wooster

Abstract

The performance and carcass composition of barrows, boars and boars implanted with 96 mg. of diethylstilbestrol (DES) was measured from a liveweight of 70.4 to 136.1 kg. Carcass characteristics were related to treatment, age, time of slaughter and carcass weight.

Implantation of boars with 96 mg. of DES at a liveweight of 70.4 kg. increased rate of gain and rate of lean and primal cut deposition. Compared to control boars, the rate of deposition of lean cuts was increased for 10 of the 12 weeks following implantation which coincided with the time during which DES exerted control over sex odor.

All boars, regardless of treatment, had carcasses that were significantly longer and leaner and yielded a higher percent lean and primal cuts than littermate barrows of the same weights. A trend for increased area of l. dorsi muscle due to DES treatment of boars was noted. The yield of edible portion and bone of the regular hams from both control and implanted boars was significantly higher and the percent of fat significantly less than in barrows.

Measures of growth, such as carcass length and I. dorsi muscle, were increased in a linear manner with increasing age and carcass weight, while differences in carcass composition were most directly related to changes in carcass weight.

Equations for the linear regression of backfat thickness and weight at slaughter from 70.4 kg. to 136.1 kg. were Y=0.62+0.0039X for control boars, and Y=O.26+O.OO55X for implanted boars.

Footnotes

2 Data in this paper were taken from a dissertation submitted to the Graduate School of the Ohio State University in partial fulfillment of the requirements for the Ph.D. degree.

3 The assistance of C. R. Weaver, Center Statistician is gratefully acknowledged.

]4 The Ohio State University Meat Laboratory,Department of Animal Science.






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Copyright © 1967 by the American Society of Animal Science.