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A comparative study of epididymal and ejaculated spermatozoa of the boar



A comparative study of epididymal and ejaculated spermatozoa of the boar



Jour Animal Sci 3(4): 360-370



A comparative study of epididymal and ejaculated sperm from 20 boars indicated that sperm undergo certain changes as they pass through the reproductive tract which reduce their ability to survive during storage. (After storage for 16 days, 51.2% of the epididymal and 9.6% of ejaculated sperm were alive.) Certain characteristics of epididymal and ejaculated sperm which might be associated with differences in survival capacity were studied. The chief morphological difference between epididymal and ejaculated sperm was the presence of a protoplasmic droplet on the former. The presence of this droplet on the mid-piece of epididymal sperm was associated with a bending of the tails of the sperm during storage. When the droplet was attached to the throat of the sperm or when it was absent, the tails of the sperm did not bend. Therefore, it appears that the bending of the tails of the sperm during storage is closely associated with the position of the protoplasmic droplet. Epididymal sperm were only slightly motile whereas ejaculated sperm were highly motile. Although epididymal sperm could be activated by the addition of 0.1% strychnine sulphate they showed only vibratory motility. Epididymal sperm were more resistant to a cold shock than were ejaculated sperm. (After 10 mins. at 0[degree] C, 65% of the sperm from the tail of the epididymis and 12.5% in the semen were alive.) Approx. 15% of the sperm died during their passage from the epididymis into the semen.

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Accession: 013286187

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DOI: 10.2527/jas1944.34360x


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