AGE-SPECIFIC REPRODUCTION IN FERAL HORSES
AGE-SPECIFIC REPRODUCTION IN FERAL HORSES
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DOI：
10.1139/z91-106
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发表时间：
1991-03-01
期刊：
影响因子：
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通讯作者：
PLOTKA, ED
中科院分区：
文献类型：
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作者：
GARROTT, RA;EAGLE, TC;PLOTKA, ED
根据在减群计划中捕获的 14 788 匹雌性马的哺乳状态以及通过血清黄体酮测定确定的 667 匹马的怀孕率，为野马（Equus caballus）制定了两个特定年龄的繁殖计划。 对于离产卵季节更远的雌性来说，检测到泌乳的概率逐渐降低，这表明这些数据导致了对真实产卵率的大幅低估。 因此，第三个繁殖计划是根据 6 月产驹季节后立即捕获的 1144 匹马的子样本构建的。 所有三个数据集的共同特征是在 2 岁时首次繁殖，到 6 岁时产卵的雌性比例增加，6 至 15 岁时产卵率最高，以及 15 岁以上雌性产卵率逐渐下降。 检测到的各年龄层的生殖活跃女性比例在人群中以及人群中的年份之间存在差异；然而，总的趋势是高繁殖率，80-90% 的壮年雌性产仔。 L. L. Eberhardt 提出的繁殖模型提供了观察到的特定年龄的产驹率变化的近似数学近似，为构建年龄结构种群模型所需的繁殖时间表提供了有用的工具。
Two age-specific reproduction schedules were constructed for feral horses (Equus caballus) on the basis of lactation status of 14 788 females captured during herd reduction programs and pregnancy rates of 667 horses determined by serum progesterone assays. The probability of detecting lactation progressively decreased for females captured further from the foaling season, indicating that these data resulted in substantial underestimates of true foaling rates. A third reproductive schedule was, therefore, constructed on the basis of a subsample of 1144 horses captured immediately after the foaling season in June. Characteristics common across all three data sets were first reproduction at age 2, an increase in the proportion of females foaling through age 6, highest foaling rates from 6 to 15 years, and a gradual decrease in foaling rates of females > 15 years. Variability in the proportion of reproductively active females in each age-class detected among populations and among years within a population; however, the general trend was high reproductive rates, with 80-90% of the prime-age females foaling. The reproduction model suggested by L. L. Eberhardt, provided a close mathematical approximation of the observed age-specific changes in foaling rates, providing a useful tool for the construction of reproduction schedules required for age-structured population models.