title: Sperm characteristics following freezing in extenders supplemented with whole egg yolk and different concentrations of low-density lipoproteins in the collared peccary (Pecari tajacu).
abstract: The aim of the current study was to compare sperm quality characteristics of the collared peccary (Pecari tajacu) following freezing in extenders supplemented with whole egg yolk and different concentrations of low-density lipoproteins (LDL). Semen from 11 adult males was obtained by electroejaculation and evaluated for sperm motility, vigor, morphology as well as membrane integrity analyzed by the hypo-osmotic swelling (HOS) test and a fluorescent staining. Moreover, the semen was diluted in a Tris-based extender containing 20% egg yolk (control group) or 5, 10 or 20% LDL (treatment groups). The semen samples were frozen in liquid nitrogen and thawed in a water bath for 60s at 37°C. The treatments did not affect (p>0.05) sperm vigor, morphology or membrane integrity analyzed by the HOS test. However, post-thaw sperm motility was significantly higher (p<0.05) in the extender supplemented with 20% LDL (36.4 ± 5.3%) compared with the egg yolk extender and extender supplemented with 10% LDL. Furthermore, the percentage of membrane-intact frozen-thawed spermatozoa analyzed by the fluorescent staining was significantly higher (p<0.05) in the extender supplemented with 20% LDL (27.4 ± 6.5%) than in the other groups. In conclusion, 20% LDL can be used to substitute the whole egg yolk as a cryoprotective additive for freezing semen of the collared peccary.
authors.affiliation: Laboratory of Animal Germplasm Conservation (LCGA), Universidade Federal Rural do Semi-Árido (UFERSA), Mossoró, RN, Brazil.
authors.forename: Ana Liza Paz
authors.initials: AL
authors.lastname: Souza
authors.affiliation: Laboratory of Animal Germplasm Conservation (LCGA), Universidade Federal Rural do Semi-Árido (UFERSA), Mossoró, RN, Brazil.
authors.forename: Gabriela Liberalino
authors.initials: GL
authors.lastname: Lima
authors.affiliation: Laboratory of Animal Germplasm Conservation (LCGA), Universidade Federal Rural do Semi-Árido (UFERSA), Mossoró, RN, Brazil.
authors.forename: Gislayne Christianne Xavier
authors.initials: GC
authors.lastname: Peixoto
authors.affiliation: Laboratory of Animal Germplasm Conservation (LCGA), Universidade Federal Rural do Semi-Árido (UFERSA), Mossoró, RN, Brazil.
authors.forename: Thibério
authors.initials: T
authors.lastname: de Souza Castelo
authors.affiliation: Laboratory of Veterinary Surgical Technique and Anesthesiology, Universidade Federal Rural do Semi-Árido (UFERSA), Mossoró, RN, Brazil.
authors.forename: Maria Glaucia Carlos
authors.initials: MG
authors.lastname: Oliveira
authors.affiliation: Laboratory of Veterinary Surgical Technique and Anesthesiology, Universidade Federal Rural do Semi-Árido (UFERSA), Mossoró, RN, Brazil.
authors.forename: Valéria Veras
authors.initials: VV
authors.lastname: de Paula
authors.affiliation: Laboratory of Animal Germplasm Conservation (LCGA), Universidade Federal Rural do Semi-Árido (UFERSA), Mossoró, RN, Brazil. Electronic address: legio2000@yahoo.com.
authors.forename: Alexandre Rodrigues
authors.initials: AR
authors.lastname: Silva
mesh_terms: D000818:Animals; D015925:Cryopreservation / Q000379:methods / Q000662:veterinary*; D003451:Cryoprotective Agents / Q000494:pharmacology; D004530:Egg Yolk; D005615:Freezing; D008077:Lipoproteins, LDL; D008297:Male; D012662:Semen Preservation / Q000379:methods / Q000662:veterinary*; D013094:Spermatozoa / Q000502:physiology*; D013552:Swine / Q000502:physiology*
chemical_list: D003451:Cryoprotective Agents; D008077:Lipoproteins, LDL
keywords: Collared peccary; Electroejaculation; Low density lipoproteins; Semen cryopreservation