Fertility, egg weight loss, hatchability, and fledging success in replacement clutches of captive American Kestrels

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Abstract
From 1974 to 1977, 78 pairs of captive American Kestrels (Falco sparverius) were induced to lay replacement clutches by removal and artificial incubation of their first clutches. No significant differences existed between first and replacement clutches for fertility, hatchability, and fledging success. Hatchability, as well as fledging success of young, did not differ significantly between artificially and naturally incubated eggs. Both fertility and hatchability declined with eggs laid later in the season.

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