For the management of captive populations of zoo animals, it is important to elucidate factors that affect the offspring birth sex ratio. On the basis of the sex allocation theory, the Trivers-Willard and mate attractive/quality hypotheses predict that maternal and paternal conditions affect offspring birth sex ratios. We examined these predictions for the birth sex ratio of aye-aye Daubentonia madagascariensis (Gmelin) by analyzing the pedigree information in the International Studbook. We found that the birth sex ratio of the aye-aye was affected by the paternal age, but not maternal age and other environmental factors (birth year, season, and institution). The younger the sire, the more the offspring sex ratio was biased toward males. These results are useful for the effective population management of captive aye-aye and illustrated the usefulness of the sex allocation theory in the sex ratio management of zoo animals.

中文翻译：

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父系年龄对圈养种群出生性别比的影响（Daubentonia madagascariensis (Gmelin)）

对于动物园动物圈养种群的管理，阐明影响后代出生性别比的因素非常重要。在性别分配理论的基础上，特里弗斯-威拉德和配偶吸引力/质量假设预测母亲和父亲的条件会影响后代出生性别比。我们通过分析国际家谱中的谱系信息，检验了这些对 aye-aye Daubentonia madagascariensis (Gmelin) 出生性别比的预测。我们发现aye-aye的出生性别比受父亲年龄的影响，但不受母亲年龄和其他环境因素（出生年份、季节和制度）的影响。父系越年轻，后代性别比例越偏向雄性。