?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Prenatal+Effects+of+Parity+on+Behavioral+Ontogeny+in+Mice&rft.creator=Crusio%2C+Wim+E.&rft.creator=Schmitt%2C+Andrea&rft.subject=Behavioral+Neuroscience&rft.description=In+mice%2C+parity+and+previous+experience+with+pups+may+influence+a+mother's+behavior+towards+her+pups%2C+thus+possibly+causing+postnatal+maternal+effects+on+the+subsequent+development+of+the+pups.+The+present+experiment+addressed+the+question+whether+parity+also+might+have+prenatal+effects.+We+studied+622+pups+from+second+or+third+litters+that+originated+from+25+genetically+different+populations+and+had+been+fostered+to+random-bred+lactating+females.+Development+of+responses+was+significantly+delayed+in+mice+from+third+litters%2C+when+compared+to+pups+from+second+litters+in+3+out+of+5+sensorial+and+4+out+of+8+motor+tests.+In+addition%2C+pups+from+second+litters+initially+were+slightly+heavier+than+those+from+third+litters.+This+difference+in+body+weight+disappeared+after+the+10th+day+postnatally.+However%2C+it+should+be+noted+that+effect+sizes+were+quite+small.&rft.date=1996&rft.type=Journal+(Paginated)&rft.type=PeerReviewed&rft.format=text%2Fhtml&rft.identifier=http%3A%2F%2Fcogprints.org%2F35%2F1%2Fparity.htm&rft.identifier=++Crusio%2C+Wim+E.+and+Schmitt%2C+Andrea++(1996)+Prenatal+Effects+of+Parity+on+Behavioral+Ontogeny+in+Mice.++%5BJournal+(Paginated)%5D+++++&rft.relation=http%3A%2F%2Fcogprints.org%2F35%2F