Kin discrimination in prepubescent and adult Long-Evans rats

► Sexually receptive female rats do not prefer an unrelated, unfamiliar male rat to their father. ► Prepubescent female rats do not prefer their father to an unrelated, unfamiliar male rat. ► Prepubescent male rats do not prefer their father to an unrelated, unfamiliar male rat. ► Adult male rats do not prefer an unrelated, unfamiliar female rat to their mother. ► Therefore, adult preferences show little evidence of inbreeding avoidance and juvenile preferences show little evidence of kin affiliation.