title: TEMPORARY STORAGE OF BOVINE SEMEN CRYOPRESERVED IN LIQUID NITROGEN ON DRY ICE AND REFREEZING OF FROZEN-THAWED SEMEN.
abstract: Two experiments were conducted. The purpose of Experiment 1 was to investigate whether viability of bovine semen stored in liquid nitrogen (-196°C) will be adversely affected by temporary exposure to dry ice (-79°C). It was convincingly shown that post thaw-motility was not affected, regardless whether semen was thawed immediately or after being returned to liquid nitrogen. Shipping or temporary storage on dry ice, thus, is a viable option. In Experiment 2, refreezing of frozen-thawed semen was attempted. The proportion of motile spermatozoa was reduced by a factor of ten to between 6.0 % and 7.4 %, regardless whether thawing occurred directly after removal from liquid nitrogen or after an interim period on dry ice. When semen was refrozen on dry ice before being returned to liquid nitrogen, motility rates were significantly improved (13.0 % to 17.0 %, P<0.05). In both experiments sperm cells that remained motile displayed vigorous forward movement and normal morphological appearance.
authors.affiliation: Current address: Department of Animal Science, Faculty of Agriculture, Bayero University, Kano, Kano State, Nigeria.
authors.forename: A M
authors.initials: AM
authors.lastname: Abdussamad
authors.affiliation: Faculty of Science and Technology, Free University of Bolzano, Bozen, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Gauly
authors.affiliation: Co Department of Animal Science, Georg-August-University Goettingen, Goettingen, Germany. wholtz@gwdg.de.
authors.forename: W
authors.initials: W
authors.lastname: Holtz
mesh_terms: D000818:Animals; D002417:Cattle / Q000502:physiology*; D015925:Cryopreservation / Q000379:methods / Q000662:veterinary*; D004367:Dry Ice; D008297:Male; D009584:Nitrogen / Q000737:chemistry; D012661:Semen / Q000166:cytology; D012662:Semen Preservation / Q000379:methods / Q000662:veterinary*; D013081:Sperm Motility; D013094:Spermatozoa / Q000166:cytology
chemical_list: D004367:Dry Ice; D009584:Nitrogen