When computing mean daily fertility in adult female tsetse, the common practice of taking the reciprocal of the interlarval period (called averaged fertility) was compared with the method of taking the sum of the products of daily fertility and adult survivorship divided by the sum of daily survivorships (called periodic fertility). The latter method yielded a consistently higher measure of fertility (approximately 10% for tsetse) than the former method. A conversion factor was calculated to convert averaged fertility to periodic fertility. A feasibility criterion was determined for the viability of a tsetse population. Fertility and survivorship data from tsetse populations on Antelope Is. and Redcliff Is., both in Zimbabwe, were used to illustrate the feasibility criterion, as well as the limitations imposed by survivorship and fertility on the viability of tsetse populations. The 10% difference in fertility between the two methods of calculation makes the computation of population feasibility with some parameter combinations sometimes result in a wrong answer. It also underestimates both sterile male release rates required to eradicate a pest population, as well as the speed of resurgence if an eradication attempt fails.

中文翻译：

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估计采采蝇的生育力：每日平均与定期幼虫的比较。

在计算成年雌性采采蝇的平均每日生育力时，将取卵间期倒数的常规做法（称为平均生育力）与取每日生育力和成年存活率乘积之和除以每日总和的方法进行比较生存（称为定期生育）。与前一种方法相比，后一种方法的生育率测量值始终较高（采采蝇约为10％）。计算转换因子以将平均生育力转换为周期性生育力。确定了采采蝇种群生存能力的可行性标准。羚羊岛采采蝇种群的生育率和生存率数据。和津巴布韦的Redcliff Is。被用来说明可行性标准，以及生存和生育力对采采蝇种群生存能力的限制。两种计算方法之间的生育率差异为10％，使得使用某些参数组合进行人口可行性计算有时会得出错误的答案。它也低估了消灭有害生物种群所需的无菌雄性释放速率，以及如果根除尝试失败的情况下复活的速度。