The physiological state of an animal may have a significant impact on its reproductive success because individuals in good body condition are generally considered to be competitively superior to individuals in poor body condition. In this study, we tested if body condition at weaning affected survival and reproduction of prairie voles ( Microtus ochrogaster (Wagner, 1842)) living under ecologically relevant conditions at two different initial population densities. We detected no evidence that better body condition at weaning was associated with either enhanced survival or reproduction. Moreover, genetic analysis of parentage found that mating between males and females was random with respect to body condition. Results of this study indicate body condition at weaning was not a reliable predictor of future survival or reproduction in prairie voles. This may be because body condition at weaning does not accurately forecast the energetic state of prairie voles at later ages, or because other factors have a greater effect on an individual’s survival and reproductive success at the densities observed in this study.
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