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Androgen receptor (AR) concentrations were measured in the prostates and livers of the infertile congenitally obese male Zucker rat and their fertile non-obese litter-mates. In obese rats AR concentrations were significantly lower in both the liver (p<0.001) and the prostates (p<0.01) of the obese rats compared with the non-obese rats, despite similar plasma testosterone concentrations in both phenotypes. These findings suggest that a potential cause for the infertility observed in the obese Zucker rat is a reduced sensitivity of target tissues to circulating androgens.