Abstract
Abstract The effects of being positioned in utero between two females (0M), a female and a male (1M) and two males (2M) was assessed on subsequent social responses of adult male Swiss and BALB/c mice en countering a standard opponent. A significant strain effect was recor ded, with outbred Swiss showing more agonistic behaviour and less non social activity than inbred BALB/c. Intrauterine position significantly affected several behavioural measures, namely: (a) 2M males showed the highest levels of both offense and defence, whereas 1M and 0M subjects displayed these activites to less extent; (b) 2M males showed less social and sexual activities but more non‐social investigation, than 1M and 0M counterparts. In this respect, 1M males displayed intermediate degrees of these behaviors in com parison to 0M and 2M subjects. Swiss mice showed a more marked behavioral variation with intrauterine location than BALB/c counter parts, thus suggesting that the impact of hormonal influences during fetal life on a wide...
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