Spermatozoa recovered from the caput epididymides of four bulls were immotile, whereas sperm from the cauda epididymides averaged 41% progressive motility. The percentage of unstained or morphologically normal spermatozoa did not differ between the caput and cauda epididymides. When caudal sperm were used to inseminate 100 cows, 69% did not return for reinsemination in 60 to 90 days.
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Igboeli et al. (1968) studied this question.
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