title: Effect of seminal plasma concentration and various extenders on postthaw motility and glass wool-Sephadex filtration of cryopreserved stallion semen.
abstract: OBJECTIVE
  To compare the effect of semen extender and seminal plasma on postthaw motility and filtration through a glass wool-Sephadex (GWS) filter for frozen stallion semen.
  
  
  METHODS
  7 stallions from which we collected > or = 3 ejaculates/stallion.
  
  
  METHODS
  4 experiments were conducted to evaluate postthaw quality of frozen stallion semen. Kenney extender was compared with glucose-EDTA extender by use of various dilution rates that resulted in differing concentrations of seminal plasma. Stallions known to produce semen with poor postthaw quality were used to investigate whether a particular extender or dilution rate could improve ability of such semen to survive freeze-thaw procedures.
  
  
  RESULTS
  Use of Kenney extender as the centrifugation extender significantly improved postthaw motility and GWS filtration, compared with glucose-EDTA. Extending semen at a dilution of 1:3 was significantly better than 1:1 for both motility and GWS filtration. In addition, including seminal plasma at a concentration of 5% in the cryopreserved semen resulted in significantly higher yield of spermatozoa after GWS filtration, compared with complete removal of SP or use of seminal plasma at 25%. Lastly, semen with poor postthaw quality had significantly improved postthaw quality in regard to motility and GWS filtration when semen was frozen with seminal plasma at a concentration of 5%, compared with semen frozen with seminal plasma at a concentration of 25%.
  
  
  CONCLUSIONS
  Use of Kenney extender at a high dilution (> or = 1:3) immediately after collection of semen can improve postthaw quality of frozen stallion semen.
authors.affiliation: Department of Clinical and Population Sciences, College of Veterinary Medicine, University of Minnesota, St Paul 55108, USA.
authors.forename: Abdorrahman S
authors.initials: AS
authors.lastname: Alghamdi
authors.forename: Mats H T
authors.initials: MH
authors.lastname: Troedsson
authors.forename: Jay L
authors.initials: JL
authors.lastname: Xue
authors.forename: Bo G
authors.initials: BG
authors.lastname: Crabo
mesh_terms: D000818:Animals; D002498:Centrifugation / Q000379:methods / Q000662:veterinary; D015925:Cryopreservation / Q000379:methods / Q000662:veterinary*; D003451:Cryoprotective Agents / Q000494:pharmacology*; D004542:Ejaculation; D006736:Horses / Q000502:physiology*; D008297:Male; D012661:Semen / Q000502:physiology*; D012662:Semen Preservation / Q000379:methods / Q000662:veterinary*; D013081:Sperm Motility / Q000502:physiology*
chemical_list: D003451:Cryoprotective Agents