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The objective of this study was to clarify the effects of liquid preservation conditions on the ability of pig sperm to activate oocytes, form a male pronucleus, and initiate preimplantational development of embryos after intracytoplasmic sperm injection (ICSI). Porcine ejaculates were preserved at 4, 14, and 24°C for up to 48h, and then damage to the plasma membrane, morphologic changes of the acrosome,...