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Endocrine Effects of Heat Stress in Boars
Endokrina effekter au värmestress hos galtar
Acta Veterinaria Scandinavica volume 24, pages 305–314 (1983)
Abstract
The purpose of this study was to describe the temporal changes in peripheral plasma levels of testosterone and Cortisol in boars during and after heat stress. A total of 8 boars were utilized, 4 of them were exposed to 35°C, for 100 h in a climatic room, and 4 served as controls and were kept at 20 °C for 100 h in the climatic room.
Blood samples were obtained via permanent vein catheters 3 times daily from 5 days before heat stress until 20 days after termination of heat stress. Testestorone levels were determined by radioimmunoassay and Cortisol by a competitive protein binding technique.
For both hormones the pre-exposure levels were similar in both groups of boars. The control boars had significantly higher testosterone levels, while being in the climatic room, than during any other period. The experimental boars had slightly increased testosterone levels during the first day of heat stress and thereafter continuously decreased levels. In the control boars the testosterone levels returned to pre-exposure levels immediately after removal from the climatic room, whereas in the experimental boars the testosterone levels were dramatically increased during the first 5 days after exposure. The differences in Cortisol levels, between the 2 groups of boars were restricted to the period spent in the climatic room. During this period the experimental boars had significantly higher Cortisol levels.
Sammanfattning
Ändamålet med föreliggande undersökning var att beskriva för-ändringar i perifera plasmanivåer av testosteron och Cortisol hos galtar under och efter värmestress. Totalt ingick 8 galtar i försöken. Fyra av dem exponerades för 35°G under 100 timmar i en klimatkammare, medan 4 galtar användes som kontroller med 20° C temperatur under 100 timmar i klimatkammaren.
Blodprover uttogs via permanent inopererade venkatetrar tre ganger dagligen med början 5 dagar före värmestressen. Provtag-ningarna pågick sedan till dess att 20 dagar förflutit sedan värme-stressen avslutats. Testosteron bestämdes med hjälp av radioimmuno-logisk teknik och Cortisol med proteinbindningsteknik.
Nivåerna av Cortisol och testosteron var lika i båda grupperna av galtar före vistelsen i klimatkammaren. Kontrollgaltarna hade signifikant högre testosteronnivåer under vistelsen i klimatkammaren än under någon annan del av observationstiden. Försöksgaltarna hade lätt stegrade testosteronnivåer under första dagen i klimatkammaren och därefter sjönk deras testosteronnivåer successivt. Kontrollgaltar-nas testosteronnivåer återgick till de ursprungliga så snart de lämnat klimatkammaren. Hos de galtar som exponerats för 35°C, sågs under de första dagarna efter värmestressen kraftigt stegrade testosteronnivåer Skillnaderna i cortisolnivåer mellan grupperna av galtar in-skränkte sig till tiden i klimatkammaren, där de galtar som exponerades för 35 °C, hade signifikant höjda cortisolnivåer.
References
Andresen, ö.: 5α-androstenone in peripheral plasma of pigs, diurnal variation in boars, effects of intravenous HGG administration and castration. Acta endocr. (Copenhagen) 1975, 78, 385–391.
Andresen, ö.: Concentrations of fat and plasma 5α-androstenone and plasma testosterone in boars selected for rate of body weight gain and thickness of back fat during growth, sexual maturation and after mating. J. Reprod. Fert. 1976, 48, 51–59.
Bambino, T. H. & A. J. W. Hsueh: Direct inhibitory effect of glucocorticoids upon testicular luteinizing hormone receptor and steroidogenesis in vivo and in vitro. Endocrinology 1981, 108, 2142–2148.
Claus, R. & W Alsing: Einfluss von Choriongonadotropin, Haltungs-änderung un d sexueller Stimulierung auf die Konzentrationen von Testosteron im Plasma sowie des Ebergeruchsstoffes im Plasma un d Fett eines Ebers. (Influence of human chorion gonadotropin, change of housing system and sexual stimulation on the concentration of testosterone in plasma and the boar taint steroid in plasma and fatty tissue of one boar) Berl. Munch, tierarztl. Wschr. 1976, 89, 354–358.
Doerr, P. & K. M. Pirke: Cortisol-induced suppression of plasma testosterone in normal adult males. J. clin, endocrinol. Metab. 1976, 43, 622–629.
Einarsson, S.: Factors affecting fertility in artificial insemination of swine. Nord. Vet.-Med. 1968, 20, 622–629.
Einarsson, S. & K. Larsson: Endocrine effects of elevated ambient temperature in boars. Proc. IXth Int. Congr. Anim. Reprod. & AI; Madrid 1980, IV, 736–740.
Hahmeier, W., M. Fenske, L. Pitzel, W. Holtz & A. König: Corticotropin- and lysine-vasopressin induced changes of plasma corticosteroids and testosterone in the adult male pig. Acta endocr. 1980, 95, 518–522.
Helwig, J. T. & K. A. Council (eds) : SAS Users’ Guide. SAS Institute Inc, Raleigh, North Carolina 1979.
Hoist, S. J.: Sterility in boars. Nord. Vet.-Med. 1949, 1, 87–120.
Juniewicz, P. E. & B. H. Johnson: Influence of adrenal steroids upon testosterone secretion by the boar testis. Biol. Reprod. 1981, 25, 725–733.
Larsson, K. & S. Einarsson: Seminal changes in boars after heat stress. To be published.
Liptrap, R. M. & J. I. Raeside: Increase in plasma testosterone concentration after injection of adrenocorticotrophin in the boar. J. Endocrinol. 1975, 66, 123–131.
Liptrap, R. M. & J. I. Raeside: A relationship between plasma concentrations of testosterone and corticosteroids during sexual and aggressive behaviour in the boar. J. Endocrinol. 1978, 76, 75–85.
McNitt, J. I. & N. L. First: Effects of 72-hours heat stress on semen quality in boars. Int. J. Biometeor. 1970, 14, 373–380.
Oltner, R., K. Lundström & L.-E. Edqvist: LH and testosterone in monozygous growing bulls. Swedish J. agric. Res. 1979, 9, 151–161.
Shille, V. M., I. Karlbom, S. Einarsson, K. Larsson, H. Kindahl & L.-E. Edqvist: Concentrations of progesterone and 15-keto-13,14-di-hydroprostaglandin F2α in peripheral plasma during the estrous cycle and early pregnancy in gilts. Zbl. Vet. Med. A. 1979, 26, 169–181.
Snochowski, M., K. Lundström, E. Dahlberg, H. Petersson & L.-E. Edqvist: Androgen and glucocortoid receptors in porcine skeletal muscle. J. Anim. Sci. 1981, 53, 80–90.
Welsh, T. H. & B. H. Johnson: Stress-induced alterations in secretion of corticosteroids, progesterone, luteinizing hormone and testosterone in bulls. Endocrinology 1981, 109, 185–190.
Welsh, T. H., R. D. Randel & B. H. Johnson: Temporal relationships among peripheral blood concentrations of corticosteroids, luteinizing hormone and testosterone in bulls. Theriogenology 1979, 12, 169–179.
Wetteman, R. P. & C. Desjardin: Testicular function in boars exposed to elevated ambient temperature. Biol. Rep rod. 1979, 20, 235–241.
Wetteman, R. P., M. E. Wells, I. T. Omtuedt, C. E. Pope & E. J. Turman: Influence of elevated ambient temperature on reproductive performance in boars. J. Anim. Sci. 1976, 42, 664–669.
Wetteman, R. P., M. E. Wells, L. W. Broch, R. K. Johnson, R. Harp & R. Vencl: Recovery of normal semen quality after heat stress of boars. Anim. Sci. Res.Rpt., Oklahoma Agric. Exp. Stn. MP. 1977, 101, 152–156.
Winfield, C. G., P. H. Hemsworth, D. B. Galloway & A. W. Makin: Sexual behaviour and semen characteristics of boars: effects of high temperature. Aust. J. exp. Agric. Anim. Husb. 1981, 21, 39–45.
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Larsson, K., Einarsson, S., Lundström, K. et al. Endocrine Effects of Heat Stress in Boars. Acta Vet Scand 24, 305–314 (1983). https://doi.org/10.1186/BF03546734
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DOI: https://doi.org/10.1186/BF03546734