Effects of Immunization Against Gonadotrophins on Male Reproductive Functions

Wickings, E. Jean; Nieschlag, Eberhard

doi:10.1016/b978-0-408-10865-2.50028-1

Cited by 3 publications

(1 citation statement)

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“…Interruption of either LHRH or LH action by active production of antibodies against these hormones inhibits function of the testes (Schanbacher 1984;Wickings and Nieschlag, 1984), thus producing castration-like effects.…”

Section: Introductionmentioning

confidence: 99%

Effect of Active Immunization against LHRH or LH in Boars: Reproductive Consequences and Performance Traits

Falvo

Chandrashekar

Arthur

et al. 1986

Journal of Animal Science

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Forty crossbred boars were equally divided into eight groups at birth. Four groups were immunized (200 ~g/boar) at 12 wk of age against either luteinizing hormone-releasing hormone (LHRH) conjugated to human serum globulin (LHRH-hSG) in complete Freund's adjuvant (CFA), LHRH-hSG in muramyldipeptide adjuvant (PEP), procine luteinizing hormone (LH) conjugated to hSG (pLH-hSG) in CFA or ovine LH (oLH) in CFA. Equal doses of boosters were given in either PEP or incomplete Freund's adjuvant (IFA) at 16 and 18 wk of age. Two groups of boars were immunized with either hSG + CFA or hSG + PEP (adjuvant controls). Two groups were castrated either at the time of weaning (castrate weaning) or at 16 wk when immunized boars were given their first booster injections (castrate booster). All pigs were slaughtered at 24 wk of age. Serum levels of LH and testosterone (T), LHRH or LH antibody titers, as well as testicular and accessory sex gland weights and histology were determined. By wk 16, LHRH antibody titers began to rise in those boars immunized against LHRH-hSG. Luteinizing hormone-releasing hormone antibody titers on wk 18, 20 and 22 were greater than those at wk 16. By 22 wk of age, LHRH-hSG boars had non-detectable plasma LH and T and reduced weights of testes and acessory sex glands. Boars immunized against oLH did not respond to treatment, whereas pLH-hSG boars showed a reduction in serum T levels and accessory sex gland weights. Immunization had no effect on average daily gain, hot carcass weights or loin eye area. Animals immunized against LHRH in CFA had increased lOth rib fat (P<.05) when compared with the castrated controls, adjuvant controls and the pLH-immunized boars. The incidence of boar taint was reduced (P<.05) in the LHRH-hSG and pLH-treated boars. We conclude that LHRH imrnunoneutralization resulted in castration-like carcass effects in boars but had no effect on performance characteristics, with the possible exception of backfat thickness. These data demonstrate for the first time that active immunization against LHRH is both feasible and practical as an alternative to surgical castration in boars.

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Section: Introductionmentioning

confidence: 99%