Difference in size between spermatozoa from the cauda epididymidis and the caput epididymidis of the rat

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Abstract
Spermatozoa were obtained from the cauda and caput epididymidis of individual Sprague-Dawley rats and their size was determined and compared using the Coulter Counter. The agreement between the size distribution curves for the spermatozoa from the caput or cauda epididymidis from the epididymides of individual rats was very close. The sperm volumes at the minimum, approximate mode (of a broad peak) and mean of the size distribution curves were significantly less (about 10%) for the spermatozoa from the cauda epididymidis than those from the caput.

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