title: Saturated, omega-6 and omega-3 dietary fatty acid effects on the characteristics of fresh, frozen-thawed semen and blood parameters in rams.
abstract: The aim of this study was to investigate the effects of several dietary fatty acids (FAs) on semen quality and blood parameters in rams. We gave diet-supplemented treatments (35 g day(-1) ram(-1)) by C16:0 (palm oil), C18:2 [sunflower oil (SO)] and an n-3 source [fish oil (FO)] to 12 rams, who were fed for 15 weeks during their breeding season. Semen was collected once per week. Semen samples were extended with Tris-based cryoprotective diluents, then cooled to 5 °C and stored in liquid nitrogen. Positive responses were seen with FO after 4 weeks. The mean prefreezing semen characteristics improved with the intake of FO (P < 0.05). Interestingly, maximum sperm output in FO was achieved 7.5 × 10(9) when compared to palm oil 5.3 × 10(9). Rams that received FO had the highest total testosterone concentrations (11.3 ng ml(-1) for FO, 10.8 ng ml(-1) for SO and 10.2 ng ml(-1) for palm oil) during the experiment (P < 0.05). FO also improved the rams' sperm characteristics after thawing (P < 0.05). Although C16:0 is a major saturated FA in ram sperm and all rams have been fed isoenergetic rations, the unique FAs of FO improved fresh semen quality and freezing ability compared to other oils.
authors.affiliation: Department of Embryology, Reproductive Biomedicine Center, Royan Institute for Reproductive Biomedicine, ACECR, Tehran, Iran.
authors.forename: V
authors.initials: V
authors.lastname: Esmaeili
authors.affiliation: Department of Embryology, Reproductive Biomedicine Center, Royan Institute for Reproductive Biomedicine, ACECR, Tehran, Iran.
authors.forename: A H
authors.initials: AH
authors.lastname: Shahverdi
authors.affiliation: Department of Animal Science, Saveh Branch, Islamic Azad University, Saveh, Iran.
authors.forename: A R
authors.initials: AR
authors.lastname: Alizadeh
authors.affiliation: Department of Embryology, Reproductive Biomedicine Center, Royan Institute for Reproductive Biomedicine, ACECR, Tehran, Iran.
authors.forename: H
authors.initials: H
authors.lastname: Alipour
authors.affiliation: Department of Epidemiology and Reproductive Health, Reproductive Epidemiology Research Center, Royan Institute, ACECR, Tehran, Iran.
authors.forename: M
authors.initials: M
authors.lastname: Chehrazi
mesh_terms: D000818:Animals; D002784:Cholesterol / Q000097:blood*; D015925:Cryopreservation; D015525:Fatty Acids, Omega-3 / Q000494:pharmacology*; D043371:Fatty Acids, Omega-6 / Q000494:pharmacology*; D008297:Male; D012661:Semen / Q000187:drug effects*; D012662:Semen Preservation; D012756:Sheep; D013094:Spermatozoa; D013739:Testosterone / Q000097:blood*
chemical_list: D015525:Fatty Acids, Omega-3; D043371:Fatty Acids, Omega-6; D013739:Testosterone; D002784:Cholesterol