Abstract
After prepuberal male rats underwent either medial preoptic area (MPOA) lesions or sham surgeries, they were housed in all-male groups (SOC-X and SOC-S treatments) or isolation (ISO-X and ISO-S treatments). In the first mating test, SOC-X rats mounted and intromitted more than ISO-X, but not SOC-S, rats. In this and across mating tests, SOC-X did not differ from SOC-S rats in the proportion ejaculating; however, fewer ISO-X than ISO-S rats ejaculated. In the first ejaculatory test, MPOA-lesioned rats ejaculated less and had shorter PEIs than shams. No consistent effects on testes or seminal vesicles (SVs) were observed.
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