Different extenders on sperm motility and plasmatic membrane integrity after ovine semen freezing and thawing

Authors

  • Fausto Paes de Carvalho
  • José Frederico Straggiotti Silva
  • Guilherme Valente de Souza Telmo Marden de Souza
  • Célia Raquel Quirino
  • Carla Sobrinho Paes de Carvalho

Abstract

The influence at the progressive motility and post-thawing plasmatic membrane integrity of different extenders (Tris-Yolk-based, Tris-Yolk/Skim Milk-based and Skim Milk-based) was studied in rams frozen semen, using a split-sample technique. The semen was obtained from four Santa Inês located in the district Campos dos Goytacazes, Rio de Janeiro, Brazil. A total of 8 semen collections per ram made possible 672 observations, i.e. 32 semen collections/ 3 semen extenders / 7 observations steps. The progressive motility was determined in the cool semen (Mpi) and after dilution with fraction A of extender (Mp1), a 2-hour balance period (Mp2), dilution in fraction B (Mp3), a 14-hour balance period (Mp4), semen exposure to N2-liquid vapor (Mp5) and post-thawing (Mp6). The sperm plasmatic membrane integrity was determined by employing fluorochromes carboxyfluorescein diacetate and propidium iodide at post-thawing (Mp6). Tris-Yolk-extender showed a Tris-Yolk/Skim Milk- and Skim Milk-extenders superior performance on recovering the post-thawing progressive motility. The rams presented the highest post-thawing sperm membrane integrity when the semen was frozen in Skim Milk-extender, in comparison to the Tris-Yolk and Tris-Yolk/Skim Milk-extenders. Concluding, it is necessary to elucidate the protection underlying mechanism conferred by the extenders studied over the investigated sperm parameters, given the finding of different extenders specificities on protecting motility and sperm integrity.

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Published

2008-09-23

Issue

Section

Animal Reproduction