title: Methionine supplementation improves ram sperm parameters during liquid storage at 5°C.
abstract: The aim of this study was to investigate the effects of methionine and lipoic acid on ram sperm parameters during liquid storage (5 °C). Ejaculates collected from five Merino rams were pooled at 37 °C. Each pooled ejaculate was divided into five equal aliquots and diluted (37 °C) with five extenders, one of which was without additives, two of which contained methionine at two different doses, and the other two of which contained lipoic acid at two different doses. Sperm parameters were determined at 0, 24, 48, 72 and 96 h of liquid storage at 5 °C. The extenders containing 2 and 4mM of methionine resulted in higher motility percentages, in comparison to the control, up to 96 h of storage. Methionine at doses of 2 and 4mM led to higher viability and sperm mitochondrial activity percentages, when compared to the controls during 48, 72 and 96 h of liquid storage (P<0.05). The findings of this study showed that methionine was of greater benefit to ram sperm parameters during liquid storage.
authors.affiliation: Department of Reproduction and Artificial Insemination, Veterinary Faculty, Selçuk University, Konya, Turkey. mustafanbucak@yahoo.com
authors.forename: Mustafa Numan
authors.initials: MN
authors.lastname: Bucak
authors.forename: Kenan
authors.initials: K
authors.lastname: Coyan
authors.forename: Caner
authors.initials: C
authors.lastname: Oztürk
authors.forename: Sükrü
authors.initials: S
authors.lastname: Güngör
authors.forename: Ali Doğan
authors.initials: AD
authors.lastname: Omür
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000494:pharmacology; D002470:Cell Survival / Q000187:drug effects; D003080:Cold Temperature; D008297:Male; D008715:Methionine / Q000494:pharmacology*; D012662:Semen Preservation / Q000379:methods / Q000662:veterinary*; D012756:Sheep; D013081:Sperm Motility / Q000187:drug effects; D013094:Spermatozoa / Q000166:cytology* / Q000187:drug effects*; D008063:Thioctic Acid / Q000494:pharmacology
chemical_list: D000975:Antioxidants; D008063:Thioctic Acid; D008715:Methionine