title: Efficiency of beetle (Dendroides canadensis) recombinant antifreeze protein for buffalo semen freezability and fertility.
abstract: Overwintering larvae of the beetle Dendroides canadensis produce potent antifreeze proteins to inhibit inoculative freezing and promote supercooling. We hypothesized that addition of Dendroides canadensis recombinant antifreeze proteins (DAFPs) in the extender will improve the quality and fertility of cryopreserved Nili-Ravi buffalo (Bubalus bubalis) sperm. The study was divided into two parts: (1) Evaluation of the effect of DAFPs on the quality of frozen-thawed buffalo bull sperm and (2) Examination of the fertilizing ability of frozen-thawed buffalo bull sperm. Semen was collected from three bulls using an artificial vagina (42 °C). Qualifying ejaculates from each bull were divided into four aliquots and diluted (at 37 °C, 50 × 10(6) sperm/mL) in tris-citric acid extender containing DAFP (at 0.1, 1.0, and 10 μg/mL), and the sperm were evaluated for important characteristics relative to a control without DAFP. D canadensis recombinant antifreeze proteins at any of the three concentrations did not affect sperm progressive motility or plasma membrane integrity (PMI), either before or after the semen was cooled to 4 °C in 2 hours. However, after 24 hours of cryostorage at -196 °C, followed by thawing at 37 °C for 30 seconds, sperm progressive motility and PMI were higher (P < 0.05) in extender containing DAFP at 10 μg/mL compared with control. The in vitro-fertilizing ability of cryopreserved (-196 °C) sperm supplemented with DAFP (10 μg/mL) was slightly higher (P = 0.098) compared with control, as assessed through in vitro cleavage rate of in vitro matured buffalo oocytes. Also, the in vivo fertility rate was evaluated by inseminating 100 buffaloes (50 inseminations per extender) 12 hours after standing heat. The fertility rate of cryopreserved buffalo bull sperm in terms of positive pregnancy at 90 days after insemination was clinically higher but remained statistically nonsignificant in extender containing DAFP at 10 μg/mL (52.0%) compared with control (43.8%). In conclusion, supplementation of 10 μg/mL of DAFP in the extender improved the motility and PMI of Nili-Ravi buffalo sperm after freeze-thawing, and yielded numerically higher, although statistically nonsignificant, in vitro cleavage, and in vivo fertility rate.
authors.affiliation: Animal Physiology Laboratory, Department of Zoology, PirMehr Ali Shah Arid Agriculture University Rawalpindi, Pakistan.
authors.forename: S
authors.initials: S
authors.lastname: Qadeer
authors.affiliation: Animal Physiology Laboratory, Department of Zoology, PirMehr Ali Shah Arid Agriculture University Rawalpindi, Pakistan.
authors.forename: M A
authors.initials: MA
authors.lastname: Khan
authors.affiliation: Buffalo Research Institute Pattoki, District Kasur, Pakistan.
authors.forename: Q
authors.initials: Q
authors.lastname: Shahzad
authors.affiliation: Animal Physiology Laboratory, Department of Zoology, PirMehr Ali Shah Arid Agriculture University Rawalpindi, Pakistan.
authors.forename: A
authors.initials: A
authors.lastname: Azam
authors.affiliation: Animal Physiology Laboratory, Department of Zoology, PirMehr Ali Shah Arid Agriculture University Rawalpindi, Pakistan.
authors.forename: M S
authors.initials: MS
authors.lastname: Ansari
authors.affiliation: Animal Physiology Laboratory, Department of Zoology, PirMehr Ali Shah Arid Agriculture University Rawalpindi, Pakistan.
authors.forename: B A
authors.initials: BA
authors.lastname: Rakha
authors.affiliation: Animal Physiology Laboratory, Department of Zoology, PirMehr Ali Shah Arid Agriculture University Rawalpindi, Pakistan.
authors.forename: R
authors.initials: R
authors.lastname: Ejaz
authors.affiliation: Animal Physiology Laboratory, Department of Zoology, PirMehr Ali Shah Arid Agriculture University Rawalpindi, Pakistan.
authors.forename: A U
authors.initials: AU
authors.lastname: Husna
authors.affiliation: Department of Biological Sciences, University of Notre Dame, Notre Dame, Indiana, USA.
authors.forename: J G
authors.initials: JG
authors.lastname: Duman
authors.affiliation: Animal Physiology Laboratory, Department of Zoology, PirMehr Ali Shah Arid Agriculture University Rawalpindi, Pakistan. Electronic address: sashraf1993@gmail.com.
authors.forename: S
authors.initials: S
authors.lastname: Akhter
mesh_terms: D000818:Animals; D021301:Antifreeze Proteins / Q000737:chemistry / Q000494:pharmacology*; D002020:Buffaloes / Q000502:physiology*; D002470:Cell Survival / Q000187:drug effects; D001517:Coleoptera / Q000502:physiology*; D015925:Cryopreservation / Q000662:veterinary*; D005298:Fertility; D005615:Freezing; D008297:Male; D011994:Recombinant Proteins; D012661:Semen / Q000187:drug effects*; D012662:Semen Preservation / Q000379:methods / Q000662:veterinary*; D013094:Spermatozoa / Q000187:drug effects / Q000502:physiology
chemical_list: D021301:Antifreeze Proteins; D011994:Recombinant Proteins
keywords: Buffalo sperm; Cryopreservation; Dendroides canadensis antifreeze protein; Ice crystal