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Male rats were passively immunized at Day 5 of age with LH-RH antiserum. Their response to LH-RH at 100 days of age was examined. Serum FSH and LH concentrations increased more than in control rats, although basal plasma levels were similar. The pituitary content of LH, but not FSH, was significantly increased, and hypothalamic content of LH-RH was similar in both groups. The testes and seminal vesicles were smaller in experimental animals than in controls. It is suggested that transient blockade of LH-RH secretion during the neonatal period produces abnormalities in pituitary-testicular functon in the adult rat.

Response of adult male rats to LH-RH after neonatal immunization with antiserum to LH-RH