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Fertility of Deep Frozen Boar Spermatozoa at Various Intervals between Insemination and Induced Ovulation
Influence of Boars and Thawing Diluents*
Acta Veterinaria Scandinavica volume 17, pages 63–73 (1976)
Abstract
This study was performed to investigate the influence of boars and thawing diluents on the fertilizing capacity of deep frozen spermatozoa at various intervals between inseminations and ovulation.
Forty-four Swedish crossbred gilts were inseminated following injection of HCG late in the prooestrus. Inseminations were performed 22, 28, 34 and 38 hrs. after injection of HCG. Ovulation was expected to occur 40 hrs. after injection of HCG. Two boars, previously tested for fertility with frozen semen, supplied the spermatozoa. Roar seminal plasma and OLEP were utilized as thawing diluents. The gilts were slaughtered 32–48 hrs. after estimated ovulation. The genital tracts were removed immediately after stunning and bleeding and the numbers of recent ovulations, recovered ova and fertilized ova were recorded. Additionally recovered ova were classified according to estimated numbers of spermatozoa attached to the zona pellucida.
Similar fertilization rates were obtained when inseminations were performed 2 and 6 hrs. before estimated ovulation. A clear decline in fertility appeared when inseminations were performed earlier than 6 hrs. before expected ovulation. The results were influenced by the boars as well as by the thawing diluents. Seminal plasma yielded a higher fertilization rate than OLEP in inseminations performed 2 hrs. before estimated ovulation. The boars yielded similar fertility in inseminations performed 2 hrs. before estimated ovulation. With increasing intervals between inseminations and ovulation the difference between the boars increased. The single gilt in which fertilized ova were found after insemination 18 hrs. before ovulation was inseminated with spermatozoa from the superior boar, thawed in seminal plasma. The present results indicate that spermatozoa with low resistance to freezing-thawing have a short fertile life in the female genital tract after insemination.
References
Alanko, M.: Fertilization and early development of ova in A.I.-gilts, with special reference to the role of tubal sperm concentration. A clinical and experimental study. Thesis, Helsinki 1974, 90 pp.
Austin, C. R.: Sperm fertility, viability and persistance in the female tract. J. Reprod. Fertil. 1975, Suppl. 22, 75–89.
Crabo, B. G. & S. Einars son: Fertility of deep frozen boar spermatozoa. Acta vet. scand. 1971, 12, 125–127.
Dziuk, P. J. & C. Polge: Fertility in swine after induced ovulation. J. Reprod. Fertil. 1962, 4, 207–208.
Hunter, R. H. F.: Porcine ovulation after injection of human chorionic gonadotrophin. Vet. Rec. 1967 a, 81, 21–23.
Hunter, R. H. F.: The effects of delayed insemination on fertilization and early cleavage in the pig. J. Reprod. Fertil. 1967 b, 13, 133–137.
Hunter, R. H. F.: Fertilization in the pig. Sequence of nuclear and cytoplasmic events. J. Reprod. Fertil. 1972, 29, 395–406.
Hunter, R. H. F.: Chronological and cytological details of fertilization and early embryonic development in the domestic pig, Sus scrofa. Anat. Rec. 1974, 178, 169–186.
Hunter, R. H. F. & P. J. Dziuk: Sperm penetration of pig eggs in relation to the timing of ovulation and insemination. J. Reprod. Fertil. 1968, 15, 199–208.
Larsson, K. & S. Einarsson: Fertility of deep frozen boar spermatozoa. Influence of thawing diluents and of boars. Acta vet. scand. 1976, 17, 43–62.
Melrose, D. R. & C. O’Hagan: Investigations into the techniques of insemination in the pig. Proc. IVth Int. Congr. Anim. Reprod. The Hague 1961, IV, 855–859.
Polge, C. & P. Dziuk: Recovery of immature eggs penetrated by spermatozoa following induced ovulation in the pig. J. Reprod. Fertil. 1965, 9, 357–358.
Pursel, V. G. & L. H. Johnson: Effect of time of insemination on fertilizing capacity of frozen boar spermatozoa. J. Animal Sei. 1975, 41, 375.
Snedecor, G.W.: Statistical Methods. Ames, Iowa 1966, 5th Ed.
Sivensson, T.: Insemination pâ svin. (Artificial insemination in the pig). SHS, Hâllsta, Sweden 1975, Message no. 70, 67 pp.
Thibault, C.: Analyse de la fécondation de l’oef de la truie après accouplement ou insémination artificielle. (Fertilization of the egg in the sow after natural mating or artificial insemination). Annales Zootech. Sér. D Suppl. 1959, 165–177.
Viring, S., S. Einarsson & K. Larsson: Fördelningen av galtspermier i den tubulära könsapparaten hos gyltor vid varierande tidpunk- ter efter insemination med fryst och färsk sperma. (Distribution of frozen-thawed and fresh boar spermatozoa in the female genital tract at various times after insemination). Proc. Xllth Nord. Vet. Congr. Reykjavik 1974, 149–150.
Viring, S., S. Einarsson & K. Larsson: The effect of boar seminal plasma on the distribution of spermatozoa in the female genital tract at various times after insemination. To be publ. 1976.
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Larsson, K. Fertility of Deep Frozen Boar Spermatozoa at Various Intervals between Insemination and Induced Ovulation. Acta Vet Scand 17, 63–73 (1976). https://doi.org/10.1186/BF03547943
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DOI: https://doi.org/10.1186/BF03547943