Abstract
Trichinella pseudospiralis infections reduced the reproductive success of captive American kestrels (Falco sparverius). Infected birds manifested a delayed onset of egg laying (day 31) when compared with uninfected controls (day 23). All control females continued to produce eggs after the first three were removed, but only 66.7% of the infected females managed to do so. Consequently, infected birds produced a mean total of only 4.9 eggs, as compared with 7.1 eggs for the controls. Breakage (29.0%) and embryo mortality (40.0%) were the major sources of egg loss among infected birds. The corresponding losses among control birds were 1.6 and 4.7%, respectively. Consequently, control birds produced an average of 2.1 hatchlings per pair, whereas infected birds produced only 0.6.
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