The aims of this study were to evaluate: (1) the effect of cryopreservation on DNA fragmentation of @entity235 epididymal spermatozoa, and (2) the potential protective effect of @entity2493 on post-thaw sperm quality (motility, morphology, acrosomal and DNA integrity). Epididymal spermatozoa were collected after orchiectomy of ten @entity235 . Sperm samples were frozen in the presence or absence of @entity2493 (1mM). DNA fragmentation index (percentage of spermatozoa with fragmented DNA) was similar in fresh samples (3.3  3.6) and samples frozen with (4.2  3.8) or without (3.6  3.7) @entity2493 . Sperm motility was significantly (p<0.0001) higher in fresh compared to frozen samples. The presence of @entity2493 in the freezing extender did not affect the sperm motility. Proportions of spermatozoa with normal morphology were similar in fresh and frozen samples, irrespective of the presence of @entity2493 in the extender. Acrosome integrity was significantly decreased (p<0.01) by cryopreservation, and @entity2493 did not exert any beneficial effects. In conclusion, DNA fragmentation of @entity235 epididymal spermatozoa was not affected by the freezing procedure, and the presence of @entity2493 did not preserve motility and acrosome integrity which were adversely affected by cryopreservation. The evaluation of DNA status of thawed gametes is particularly relevant for epididymal spermatozoa since these spermatozoa are usually stored and used in assisted reproductive techniques.

DNA integrity of fresh and frozen XXXX epididymal spermatozoa.

@entity235 :: ('9615', 'Species') :: ['canine', 'dogs'] @entity2493 :: ('MESH:D008550', 'Chemical') :: ['melatonin']
@entity235 :: (9615,Species) :: ['canine']
