title: Effect of butylated hydroxytoluene (BHT) on the cryopreservation of common carp (Cyprinus carpio) spermatozoa.
abstract: The aim of the present study was to test the effects of butylated hydroxytoluene (BHT) on the cryopreservation of common carp spermatozoa. BHT is widely used in the cryopreservation of the spermatozoa of different animal species and successfully sustains the characteristics of spermatozoa during freezing and thawing, but it has not previously been used with fish. After sampling, common carp spermatozoa were diluted with an extender composed of modified Kurokura's extender, 10% DMSO, and 10% egg yolk containing 0.0001, 0.001, 0.01, 0.1, 1, 2.5, 5, or 10mM BHT and subsequently frozen in liquid nitrogen. The post-thaw spermatozoa characteristics (i.e., progressive motility percentage (%), duration of progressive motility (s), fertilization rate (%), and eyed-eggs rate (%)) were evaluated and compared with those of the control group. There were significant increases in the percentage of progressive motility and the duration of progressive motility at the concentrations of 0.1 and 0.001mM BHT (P<0.05). The duration of post-thawed spermatozoa progressive motility at 0.001mM BHT was significantly greater than that of the other groups (39.6±0.4s, P<0.05), and the fertilization rates and eyed-eggs rates were also higher following the 0.1 and 1mM BHT treatments. BHT at concentrations of more than 1mM caused sperm immobility during the preparatory stages of the sperm freezing. We concluded that 0.001-0.1mM BHT can be beneficial for the cryopreservation of common spermatozoa.
authors.affiliation: Muğla Sıtkı Koçman University, Faculty of Fisheries Department of Aquaculture, 48000 Muğla, Turkey. Electronic address: fatihogretmen@mu.edu.tr.
authors.forename: F
authors.initials: F
authors.lastname: Öğretmen
authors.affiliation: Muğla Sıtkı Koçman University, Faculty of Science, Department of Biology, 48000 Muğla, Turkey.
authors.forename: B E
authors.initials: BE
authors.lastname: İnanan
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000494:pharmacology*; D002084:Butylated Hydroxytoluene / Q000494:pharmacology*; D002347:Carps; D002470:Cell Survival / Q000187:drug effects; D015925:Cryopreservation / Q000379:methods* / Q000662:veterinary; D003451:Cryoprotective Agents / Q000494:pharmacology; D005306:Fertilization / Q000187:drug effects; D005615:Freezing; D008297:Male; D012662:Semen Preservation / Q000379:methods* / Q000662:veterinary; D013081:Sperm Motility / Q000187:drug effects; D013094:Spermatozoa / Q000187:drug effects* / Q000502:physiology
chemical_list: D000975:Antioxidants; D003451:Cryoprotective Agents; D002084:Butylated Hydroxytoluene
keywords: Butylated hydroxytoluene; C. carpio; Sperm cryopreservation; Sperm motility; Spermatozoa