J. Anim Sci.
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J. Anim Sci. 1986. 62:1279-1289.
© 1986 American Society of Animal Science
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An Immunological Approach for Prevention of Boar Odor in Pork1,2,

R. I. Brooks3, A. M. Pearson3, M. G. Hogberg4, J. J. Pestka3 and J. I. Gray3

Michigan State University, East Lansing 48824

Abstract

The objective of this study was to inhibit accumulation of the C19-{Delta}16-steroids responsible for boar odor in pork by actively immunizing young, growing boars with C19-{Delta}16-steroid-bovine serum albumin (BSA) conjugates. Thirty-two boars from eight separate litters were allotted into three different treatment groups. Group 1 consisted of 16 intact boars that were immunized on three occasions at average weights of 30, 55 and 75 kg with a 1:1 mixture of 5,16-androstadien-3β-ol-BSA and 4,16-androstadien-3-one-BSA to block production of C19-{Delta}16-steroids. Group 2 consisted of eight intact non-immunized boars (untreated controls), while Group 3 consisted of eight barrows castrated at 21 d of age. Immunization reduced (P<.05) mean (58%) and mode (79%) sensory scores for boar-odor intensity and reduced mean adipose-tissue concentrations of the C19-{Delta}16-steroids (63%). However, three of the immunized boars had adipose-tissue concentrations of 5{alpha}-androst-16-en-3-one (.98µg/g) and 5{alpha}-androst-16-en-3{alpha}-ol (.14 µ.g/g) that were comparable to those of the untreated control boars. Exclusion of the data from these three boars from statistical analysis reduced boar-odor intensity scores by 75% (mean) and 93% (mode) and adipose-tissue concentrations of C19-{Delta}16-steroids by 80%. Additional research is needed to determine the optimal age/weight, frequency and duration of the immunization scheme required to completely inhibit production of the C19-{Delta}16-steroids. The immunization procedure did not affect weight gain, efficiency of feed utilization, average backfat thickness or percent carcass muscle.

Footnotes

1 Michigan Agr. Exp. Sta. Journal Article No. 11657.

2 The financial support of the Natl. Pork Producers Council, Des Moines, IA is gratefully acknowledged.

3 Dept. of Food Sci. and Human Nutr.

4 Dept. of Anim. Sci.






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Copyright © 1986 by the American Society of Animal Science.