Male social status, physiology, and ability to block pregnancies in female house mice (Mus musculus)

摘要: 1. Dominant and subordinate male house mice (Mus musculus) were examined for differences in ability to induce a pregnancy block (Bruce effect) recently inseminated female conspecifics. 2. A became behaviorally dominant or by one two daily 15-min agonistic encounters with other 5 months. Social status was monitored the outcome of fighting, urine-marking patterns, animals' urine increase uterine weights prepubertal females. Clear found all these parameters during experiments. When killed, males had larger testes, preputials, seminal vesicles. Adrenal glands significantly heavier subordinates. 3. Subordinates blocked pregnancies as effectively both dominants control no previous social experience.