Effects of perinatal gonadal secretions on parameters of receptivity and weight gain in hamsters.

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Abstract
Influence of ovarian and testicular secretions on lordosis was examined in 64 female hamsters ovariectomized when 1 or 43 days old and in 80 males castrated when 1, 3, 5, or 43 days old. The first of eight weekly 10-min mating tests was initiated at 57 or 113 days. Receptivity was not different among female groups except for higher initial scores for those with ovaries through puberty. Initial and maximum receptivity in males was inversely proportional to castration age. Rate of decrease from maximum appeared higher in males castrated at Days 3 and 5 than at Day 1. Age of initial test was significant for males; older animals had lower initial and maximum receptivity scores. Gonadal secretions decreased weights in both sexes.

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