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. 1984 Mar 1;25(1):57–66. doi: 10.1186/BF03547279

Seminal Changes in Boars After Heat Stress

Spermaförändringar av värmestress hos galtar.

Kjell Lars son 1,2,✉, Stig Einarsson 1,2
PMCID: PMC8287463  PMID: 6464925

Abstract

The object of the present study was to investigate the influence of elevated ambient temperature on sperm production, sperm morphology and composition of seminal plasma in boars. A total of 8 boars were used, 4 of them were exposed to 35°C, in a climate room, during 100 h and 4 served as controls and were kept at 20°C during 100 h in the climate room.

Ejaculate volume and total sperm count per ejaculate remained unaltered. An obvious decrease in sperm motility was seen in all heat exposed boars 15–21 days after the exposure. The most consistent increase in sperm abnormalities were proximal cytoplasmic droplets and abnormal sperm heads. The highest levels were found during the 4th week after exposure. All the sperm characteristics assessed had returned to normal levels at the end of the experimental period, which means 7–8 weeks after the end of exposure.

Only minor and inconsistent alterations were found in the seminal plasma components analysed and these changes were observed both in control and experimental boars.

Keywords: boars, elevated ambient temperature, sperm morphology, semen biochemistry

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References

  1. Bane, A.: Acrosomal abnormality associated with sterility in boar. IVth Int. Congr. Anim. Reprod., The Hague 1961, vol. 4, 810–817.
  2. Bonte, P., M. Vandeplassche & A. Sagane: Functional epididymal dissorders in boars. Zuchthygiene 1978, 13, 161–175
  3. Egbunike G. N., Jeyakumar L. H. Some biochemical characteristics of porcine seminal plasma under stressful hot humid climate conditions. Zbl. Vet. Med. A. 1980;27:555–562. doi: 10.1111/j.1439-0442.1980.tb01872.x. [DOI] [PubMed] [Google Scholar]
  4. Einarsson S. Factors affecting fertility in artificial insemination of swine. Nord. Vet.-Med. 1968;20:622–629. [Google Scholar]
  5. Einarsson, S.: Studies on the composition of epididymal content and semen in the boar. Acta vet. scand. 1971, 11, suppl. 36, 80 pp. [PubMed]
  6. Einarsson, S. & B. Gustafsson: A case of epididymal dysfunction in boar. Andrologie 1973, 5. 273–279. [DOI] [PubMed]
  7. Einarsson, S. & K. Larsson: Exposure of boars to elevated ambient temperature: morphological studies of the ejaculated semen. Proc. I.P.V.S. Congr., Mexico 1982, p. 215.
  8. Gustafsson, B., B. Crabo & S. Einarsson: Morphology of the spermatozoa and composition of the plasma in the boar epididymis. Proc. 11th Nord. Vet. Gongr., Bergen 1970, p. 241.
  9. Hancock J. L. The morphology of boar spermatozoa. J. R. microsc. Soc. 1957;76:84–97. doi: 10.1111/j.1365-2818.1956.tb00443.x. [DOI] [PubMed] [Google Scholar]
  10. Holst S. J. Sterility in boars. Nord. Vet.-Med. 1949;1:87–120. [Google Scholar]
  11. Karlbom, I., S. Einarsson & L.-E. Edqvist: Attainment of puberty in female pigs: Clinical appearance and patterns of progesterone, oestradiol-17β and LH. Anim. Rep rod. Sci. 1982, 4, 301–312.
  12. Lagerlöf, N.: Morphologische Untersuchungen über Veränderungen im Spermabild un in den Hoden bei Bullen mit verminderter oder aufgehobener Fertilität. (Morphological studies of changes in the semen picture and the testicles in bulls with lowered fertility or sterility). Acta path, microbiol. scand. 1934, suppl. 19, 254 pp.
  13. Larsson K., Einarsson S., Lundström K., Hakkarainen J. Endocrine effects of heat stress in boars. Acta vet. scand. 1983;24:305–314. doi: 10.1186/BF03546734. [DOI] [PMC free article] [PubMed] [Google Scholar]
  14. Mazzari, G., F. du Mesnil du Buisson & R. Ortavant: Action de la température et de la lumière sur la Spermatogenèse, la production et le pouvoir fécondant du sperme chez le verrat. (Action of temperature and light on spermatogenesis, sperm production and fertility of the boar). Proc. VIth Int. Congr. Anim. Reprod. & A.I., Paris, 1968, I, 305–308.
  15. McNitt J. I., First N. L. Effects of 72 hour heat stress on semen quality in boars. Int. J. Biometeor. 1970;14:373–380. doi: 10.1007/BF01462914. [DOI] [PubMed] [Google Scholar]
  16. McNitt, J. I., C. B. Tanner & N. L. First: Thermoregulation in the scrotal system of the boar. I. Temperature distribution. J. Anim. Sci. 1972, 34 , 112–116. [DOI] [PubMed]
  17. Signoret, J. P. & F. du Mesnil du Buisson: Influence des conditions d’habitat du verrat sur la fécondance du sperme. (Influence of the housing conditions of boars on the fertility of the spermatozoa). Proc. VIth Int. Congr. Anim. Reprod. & A.I., Paris, 1968, I, 317–319.
  18. Swierstra E. E. Cytology and duration of the cycle of the seminiferous epithelium of the boar; duration of spermatozoan transit through the epididymis. Anat. Rec. 1968;161:171–186. doi: 10.1002/ar.1091610204. [DOI] [PubMed] [Google Scholar]
  19. Thibault, C., M. Courot, L. Martinet, P. Mauleon, F. du Mesnil du Buisson, R. Ortavant, J. Pelletier & J. P. Signoret: Regulation of breeding season and estrous cycles by light and external stimuli in some mammals. J. Anim. Sci. 1966, 25, suppl. 1, 119–142. [DOI] [PubMed]
  20. Wettemann, R. P., M. E. Wells, L. W. Brock, R. K. Johnson, R. Harp & R. Vencl: Recovery of normal semen quality after heat stress of boars. Oklahoma Agric. Exp. Stn. Anim. Sci. Res. Rpt. 1977, 152–156.

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