Heterosis associated with regional crossbreeding between captive groups of rhesus macaques

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Abstract
The lengths and weights of male and female Chinese‐Indian hybrid rhesus macaques were compared with those of age‐ and sex‐matched non‐hybrid (Indian) controls to assess the occurrence of heterosis (hybrid vigor). Hybrid males and females had higher average, age‐adjusted values of weight than nonhybrids. Hybrid males, but not females, also had a higher average, age‐adjusted length than nonhybrids. These results are consistent with the hypothesis that regional crossbreeding of rhesus monkeys fosters heterosis.