Individual return to Leydig cell function after GnRH-immunization of boars.

Abstract:

:Immunization of boars against GnRH inhibits synthesis of testicular anabolic steroids and the sex odour androstenone. Time between second vaccination and return of Leydig cell function is unknown. Six catheterized boars received the second dose (Improvac) at 26 weeks of age (day 0). Titre, LH, testicular steroids, and IGF-I were determined in blood until testosterone exceeded 0.5 ng/mL again in all boars. At week 10 the titre was low again. Return of testicular function was preceded by increased pulsatile secretion of LH but onset of steroid synthesis was delayed and highly variable (10-24 weeks) and was not related to the initial antibody titre. A major reason for delayed onset of Leydig cell function apparently is a variable refractoriness against LH.

journal_name

Vaccine

journal_title

Vaccine

authors

Claus R,Rottner S,Rueckert C

doi

10.1016/j.vaccine.2008.05.085

subject

Has Abstract

pub_date

2008-08-18 00:00:00

pages

4571-8

issue

35

eissn

0264-410X

issn

1873-2518

pii

S0264-410X(08)00710-X

journal_volume

26

pub_type

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