title: In vitro comparison of egg yolk-based and soybean lecithin-based extenders for cryopreservation of ram semen.
abstract: Substitution of egg yolk with soybean lecithin may reduce hygienic risks in extenders. Though a few studies have been performed on the effect of soybean lecithin in bull, to date evaluation of ram semen in vitro fertility after cryopreservation with use of soybean lecithin has not been studied. This study assessed the effect of 1% or 2% (wt/vol) soybean lecithin (L1 or L2) or 15% or 20% (vol/vol) egg yolk (E15 or E20) supplemented with 5% or 7% glycerol (G5 or G7) in a Tris-based medium for cryopreservation of ram (Oviss arries) semen. Although no significant difference was observed in pattern of capacitation, the best results in terms of sperm motility, viability postthaw, and cleavage rates were observed with L1G7 (51.9+/-4.8%, 48.1+/-3.5%, and 79.6+/-3.9%, respectively) and E20G7 (51.8+/-2.9%, 46.7+/-4.0%, and 72.9+/-6.4%, respectively). Our results also showed that 1% lecithin and 20% egg yolk was superior to 2% lecithin and 15% egg yolk. In terms of cleavage rate, 7% glycerol was superior to 5% glycerol. No significant difference was obtained between groups in terms of blastocysts rate per cleaved embryo. Therefore, we concluded that the optimal concentration of lecithin and egg yolk is 1% and 20%, respectively, along with 7% glycerol. In addition, our results suggest that lecithin can be used as a substitute for egg yolk.
authors.affiliation: School of Sciences, Islamic Azad University, Marvdasht Branch, Marvdasht, Iran.
authors.forename: M
authors.initials: M
authors.lastname: Forouzanfar
authors.forename: M
authors.initials: M
authors.lastname: Sharafi
authors.forename: S M
authors.initials: SM
authors.lastname: Hosseini
authors.forename: S
authors.initials: S
authors.lastname: Ostadhosseini
authors.forename: M
authors.initials: M
authors.lastname: Hajian
authors.forename: L
authors.initials: L
authors.lastname: Hosseini
authors.forename: P
authors.initials: P
authors.lastname: Abedi
authors.forename: N
authors.initials: N
authors.lastname: Nili
authors.forename: H R
authors.initials: HR
authors.lastname: Rahmani
authors.forename: M H
authors.initials: MH
authors.lastname: Nasr-Esfahani
mesh_terms: D020101:Acrosome Reaction / Q000502:physiology; D000818:Animals; D015925:Cryopreservation / Q000379:methods / Q000662:veterinary*; D003451:Cryoprotective Agents; D004530:Egg Yolk; D005307:Fertilization in Vitro / Q000662:veterinary*; D054709:Lecithins; D008297:Male; D012662:Semen Preservation / Q000379:methods / Q000662:veterinary*; D012756:Sheep; D013025:Glycine max / Q000737:chemistry*; D013081:Sperm Motility / Q000502:physiology; D013094:Spermatozoa
chemical_list: D003451:Cryoprotective Agents; D054709:Lecithins