Abstract
Adult albino rats with regular estrous cycles were exposed to continuous auditory stimuli (2,000 cycles per second; 100 ± 10 decibels on weighting C) for up to 150 days. Of the total of 74 rats, 31 (41.9 per cent) developed persistent vaginal estrus, as defined by a minimum of 10 consecutive days of fully cornified estrous smears, the highest incidence (66.6 per cent) being seen after 150 days of auditory stimuli. With increasing duration of auditory stress in persistent-estrus rats, there was an increase in the relative weights of the uteri and a decrease of the adrenals and ovaries, but no significant changes in the weights of the anterior pituitary glands were evident. In the ovaries of sound-exposed rats with irregular estrous smears, different types of follicles or many corpora lutea were present. With the development of persistent estrus subsequently, only polycystic follicles but no corpora lutea were found. It is postulated that certain auditory stimuli may be deleterious to the neuroendocrine mechanism of reproduction in the mammals.
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