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In Drosophila, male accessory gland fluid (seminal fluid) has multiple effects on the female's reproductive efficiency. Here, we show the effect of seminal fluid on rate of egg hatch immediately following mating. Singly mated females were remated to two classes of sterile males, one with seminal fluid and one without seminal fluid. Transfer of seminal fluid results in a strong reduction in egg hatch shortly after the mating. Also, it is shown that remating with normal males causes an immediate reduction of egg hatch followed by recovery to normal egg hatch. In all cases, unhatched eggs contained no sperm. These results are consistent with a role for seminal fluid in sperm competition, mediated by incapacitation or inefficient use of resident sperm.

Seminal fluid causes temporarily reduced egg hatch in previously mated females