Effects of reproductive experience on paternal behavior, levels of testosterone, prolactin in serum and dendritic spines in medial prefrontal cortex of mandarin voles

Integrative Zoology
Bo WangFadao Tai

Abstract

Maternal behaviors and brains change dramatically with pregnancy, parturition and other mothering experiences. However, whether paternal behavior, brain plasticity and levels of relevant hormones also change along with fathering experience and pups' age remains unclear. Using socially monogamous mandarin voles (Microtus mandarinus), we found that experienced fathers exhibited more active paternal behaviors, such as licking, retrievals and nest building, but less paternal care, such as huddling, than new fathers. The high levels of licking and nest building appeared in the earlier days of their mate's lactation. Experienced fathers retrieved 9-13-day-old pups more frequently. However, these paternal behaviors did not show significant changes with age of pups in new fathers. In addition, experienced fathers had dramatically higher prolactin levels than new fathers but had similar concentrations of testosterone to new fathers. New fathers had lower levels of testosterone but higher levels of prolactin than new paired males. The fathers had higher prolactin levels in the earlier days of their mate's lactation. The new and experienced fathers had similar dendritic length and spine density on pyramidal neurons in the medial prefronta...Continue Reading

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