title: Effect of cryopreservation of zona-binding capacity of canine spermatozoa in vitro.
abstract: The hemizona assay (HZA) was used as a functional test for zona pellucida binding capacity of fresh and frozen-thawed canine spermatozoa. We investigated 30 ejaculates from 3 dogs with sperm motility > 70% and sperm concentration > 5.10(8) cells per ejaculate with up to 20% abnormal and dead spermatozoa. Fifteen ejaculates were each divided into 2 portions: one portion was used for analysis of fresh semen, the other for cryopreserved semen. On the day of the experiments, in vitro-matured canine oocytes were bisected into 2 equal hemizonae. One half of the hemizonae were coincubated with fresh capacitated (control) spermatozoa, the other half of the hemizonae were coincubated with frozen-thawed (tested) spermatozoa at final concentration of 1 to 2 x 10(6) cells/mL in 200 microL droplets of BSA-supplemented Toyoda, Yokojama and Hoshi (TYH) medium at 37 degrees C, 5%, CO2 for 1 h. Sperm suspensions were examined kinesigraphically for post capacitation type of movement. The Student's t-test was used to compare differences between semen parameters. The data on HZA binding activity of fresh and frozen-thawed canine semen were analyzed by ANOVA and then by the Newman-Keuls multiple range method. The results showed no differences in the initial semen quality parameters among the 3 dogs. After thawing, the semen from Dog 1 and Dog 2 demonstrated relatively uniform sperm parameters, while in Dog 3 sperm motility, and viability and the percentage of morphologically normal spermatozoa were significantly decreased. The binding activity of frozen-thawed spermatozoa from the 3 dogs was significantly reduced (29.40 +/- 9.02, 18.60 +/- 3.30, 8.20 +/- 4.49) compared with that (107.20 +/- 19.22, 109.80 +/- 20.75, 78.20 +/- 12.47; P < 0.01) of fresh spermatozoa. The results showed that semen samples with similar sperm parameters prior to cryopreservation displayed different sperm zona-binding capacity after freezing. The HZI (value of sperm binding capacity of frozen-thawed vs fresh semen samples) was higher in Dog 1 (27.43) than in Dog 2 (16.90) or Dog 3 (10.40), and thus confirmed the variation of zona binding activity after thawing between dogs. The freezability of individual dog semen is discussed. In conclusion HZA may be a valuable tool for evaluating the post-thaw fertilizing ability of canine spermatozoa.
authors.affiliation: Institute of Biology and Immunology of Reproduction, Sofia 1113, Bulgaria.
authors.forename: M
authors.initials: M
authors.lastname: Ivanova
authors.forename: M
authors.initials: M
authors.lastname: Mollova
authors.forename: M G
authors.initials: MG
authors.lastname: Ivanova-Kicheva
authors.forename: M
authors.initials: M
authors.lastname: Petrov
authors.forename: T
authors.initials: T
authors.lastname: Djarkova
authors.forename: B
authors.initials: B
authors.lastname: Somlev
mesh_terms: D000818:Animals; D015925:Cryopreservation; D004285:Dogs; D005260:Female; D005307:Fertilization in Vitro / Q000662:veterinary*; D008297:Male; D012662:Semen Preservation / Q000662:veterinary; D013075:Sperm Capacitation; D013076:Sperm Count; D013081:Sperm Motility; D013094:Spermatozoa / Q000502:physiology*; D015044:Zona Pellucida / Q000378:metabolism*