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Influence of Diethylstilbestrol Implantation on Growth and Carcass Characteristics of Boars¹

Ohio Agricultural Experiment Station, Wooster

Abstract

In seven trials the effectiveness of implanting boars with diethylstilbestrol (DES) was studied as a method for overcoming or delaying the development of the odor or flavor commonly associated with boar meat and for retaining or further improving the desirable performance and muscling characteristics of the boar.

Feedlot performance as well as carcass and organoleptic characteristics of marketweight (205–215 lb.) barrows, boars and boars implanted with either 48 mg. DES at 155 lb. liveweight or 96 mg. at 145, 155 or 165 lb. were compared.

The rate of gain of boars implanted with 96 mg. of DES at a liveweight of 155 lb. was significantly faster than that of unimplanted controls and barrows, and treatment also resulted in an improvement in efficiency of feed conversion.

Barrows were significantly shorter and fatter than control boars, or boars implanted at 155 lb. with either 48 or 96 mg. DES. This difference was reflected in a significant decrease in the yield of lean cuts in barrows as a percent of carcass weight. Implantation of boars at a liveweight of 155 or 165 lb. did not significantly alter the desirable lean muscling characteristics of the boar carcass, although implantation of 145 lb. with 96 mg. DES did increase fat deposition and decrease the lean cut yield.

Area of longissimus dorsi muscle was not influenced by implantation of 96 mg. DES at 155 lb., while the deposition of intramuscular fat in this muscle was significantly increased and color of the muscle was more uniform. Sex odor and flavor in 1Oth-rib loin chops were significantly reduced and in no case were the carcasses from boars implanted with this level of DES condemned because of odor or flavor score. There was a non-significant residue of DES in the loin tissue from implanted boars.

¹ Published with the approval of the Associate Director as Journal Article No. 59–63.

² The assistance of C. R. Weaver, Station statistician, is gratefully acknowledged.