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Relationship between acrosomal conditions of frozen-thawed spermatozoa and results of superovulation/artificial insemination-embryo collection (SOV/AI-EC) tests using frozen-thawed spermatozoa in Japanese Black bulls. Filled circles (●) indicate the results obtained for each of 16 bulls (A1, A3–A9, B1-B5 and C1–C3).
