Abstract
Under the same hormonal conditions, mammary gland growth in adult female rats is more pronounced than in males. Since there are no differences in the glandular development of both sexes, either at birth or at 30 days of life, it is assumed that male rats react less sensitively than female rats in response to a hormonal stimulus with regard to mammary gland growth. It is presumed that androgen influence during the differentiation stage is responsible for the fixation of a decreased sensitivity of the positive feedback-mechanism between estrogens and prolactin secretion in males. Thus changes in sensitivity would be the reason for mammary gland growth in males being smaller than in females under the same hormonal conditions.
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