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Effects of castration on serum LH and FSH concentrations in male guinea-pigs

The gonadotrophic hormones LH and FSH of guinea-pigs have complete specific cross-reaction with the corresponding rat hormones (Croix & Franchimont, 1975) in heterologous systems of radioimmunological measurement comprising ovine anti-LH or anti-FSH sera (Niswender, Midgley, Monroe & Reichert, 1968; Hendrick, Legros & Franchimont, 1971). We have used these systems to show a dissociation of the discharge of FSH and LH during the oestrous cycle, particularly at the time of ovulation when the LH peak occurs well before that of FSH (Croix & Franchimont, 1975), and during the postnatal period (Croix, 1976). The present study was an investigation of the effect of castrating guinea-pigs on the variations in serum concentrations of FSH and LH.