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Journal of Animal Science, Vol 76, Issue 7 1760-1766, Copyright © 1998 by American Society of Animal Science

JOURNAL ARTICLE

Testis function, carcass traits, and aggressive behavior of beef bulls actively immunized against gonadotropin-releasing hormone

C. C. Huxsoll, E. O. Price and T. E. Adams
Department of Animal Science, University of California, Davis 95616, USA.

We assessed testis function, aggressive behavior, and carcass traits in beef bulls actively immunized against GnRH at 1, 4, or 6 mo of age. In addition, we examined the effect of combining immunization with insertion of estrogen-containing implants (Synovex C) at 1 mo of age. Unimmunized bulls and steers were included as control animals. All immunized calves received a secondary immunization at 12 mo of age. Anti-GnRH titer was evident at slaughter in all immunized animals. Neither age at primary immunization nor implant status affected (P > .05) anti-GnRH titer at slaughter. Immunization, but not implant status, reduced (P < .05) serum concentration of testosterone and testis weight at slaughter. The final live weight and feedlot gain of immunized and unimmunized bulls were comparable (P > .05). In contrast, aggressive behavior was reduced (P < .05) and carcass quality was improved (P < .05) by immunization. These data suggest that active immunization against GnRH is a practical, noninvasive alternative to physical castration in the management of bull calves.


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Copyright © 1998 by the American Society of Animal Science.