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Monogamous social organization is characterized by selective affiliation with a partner, high levels of paternal behaviour and, in many species, intense aggression towards strangers for defence of territory, nest and mate. Although much has been written about the evolutionary causes of monogamy, little is known about the proximate mechanisms for pair(More)
Prairie voles (Microtus ochrogaster) are monogamous mammals that form male-female pair bonds. Partner preference formation, one component of the pair bond in prairie voles, occurs following male-female cohabitation and is facilitated by mating. The peptide hormone oxytocin is released during physical contact and particularly following vaginal stimulation.(More)
Electrolytic lesions of the paraventricular nucleus (PVN) of the hypothalamus were found to disrupt the initiation but not the maintenance of maternal behavior in primiparous Sprague-Dawley rats. Following lesions performed on Day 15 of gestation, measures of maternal behavior (grouping, crouching, and nest building), pup retrieval, and pup weight gain were(More)
Rat pups, when socially isolated, emit ultrasonic vocalizations which are believed to indicate distress. This study investigated the effect of intracerebroventricular (ICV) administration of corticotropin releasing factor (CRF) on the production of ultrasonic isolation calls. Following a 2-minute baseline isolation test, rat pups (5-6 days old) were(More)
Oxytocin (OT) transmission is involved in the steroid-dependent display of sexual receptivity in rats. One of the biochemical processes stimulated by the ovarian steroid 17 beta-estradiol (E2) that is relevant to reproduction is the induction of OT receptor binding in the ventromedial hypothalamic nucleus (VMN). The purpose of these experiments was to(More)
Experiments were conducted to determine the source of steroid-dependent oxytocin (OT) receptors that surround the ventrolateral portion of the ventromedial hypothalamic nucleus (vl-VMN). Ovariectomized rats received sham or unilateral electrolytic lesions of the vl-VMN. Three days later and for the next 4 days, animals were injected with 10 micrograms of(More)
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