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Plasma prolactin concentrations increased only towards the end of the breeding phase and were at their annual height during the summer. In photorefractory drakes removal of 90% of the testicular tissue not only increased plasma LH levels but induced complete spermatogenesis within 6 weeks. It seems that photorefractoriness in mallards is due to an increased sensitivity of the hypothalamo-hypophyseal system to the negative feedback action of testicular androgens.
- Author
- Carmelo Campuzano Luna
- Language
- EN