Effects of season on semen parameters and relationships between selected semen characteristics in Hypor boars

  The aim of this study was to evaluate the effect of the season of the year on the quality of Hypor boar semen and to determine the correlations between selected semen characteristics in particular seasons. Ejaculates from Hypor boars were analyzed for volume, sperm concentration, percentage of spermatozoa with normal motility, total number of spermatozoa, and the number of insemination doses per ejaculate. Microscopic slides were prepared from semen samples. Each sample was evaluated for the morphology of spermatozoa. Spermatozoa with normal morphology were counted, as well as those with both major and minor abnormalities. Spermatozoa were measured for morphometric traits. Ejaculates were grouped by the season of collection: winter, spring, summer, and autumn. Correlation coefficients were calculated between sperm morphometric traits and the concentration and total count of spermatozoa in ejaculates. In spring and winter, sperm concentrations are higher compared to ejaculates collected in summer and autumn. In spring and summer, ejaculates contain spermatozoa of greatest motility. In spring, sperm cells have largest head dimensions. In autumn, spermatozoa are smallest in terms of dimensions. Significant correlations were observed between sperm concentration and total number of sperm in ejaculates vs. morphometric dimensions of sperm heads in Hypor boars' semen in the autumn, winter, and summer.

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  • Kowalewski D, Kondracki S, Górski K, Bajena M, Wysokińska A. Effect of piggery microclimate on ejaculate performance of artificial insemination boars. Kafkas Univ Vet Fak 2016;22: 225-232.
  • Wysokińska A, Kondracki S, Kowalewski D, Adamiak A, Muczyńska E. Effect of seasonal factors on the ejaculate properties of crossbred Duroc × Pietrain and Pietrain × Duroc boars. B Vet I Pulawy 2009; 53: 677-685.
  • Kondracki S, Iwanina M, Wysokińska A, Górski K. The use of sexual activity measurements to assess ejaculatory performance of boars. Arch Tierzucht 2013; 56: 1052-1059.
  • Górski K, Kondracki S, Wysokińska A, Nazaruk A. The importance of ejaculate volume for the physical parameters of ejaculates and sperm morphology of Hypor boars. Kafkas Univ Vet Fak 2016; 22: 493-501.
  • Petrocelli H, Batista C, Gosálvez J. Seasonal variation in sperm characteristics of boars in southern Uruguay. R Bras Zootec 2015; 44: 1-7.
  • Phillips NJ, McGowan MR, Johnston SD, Mayer DG. Relationship between thirty post-thaw spermatozoa characteristics and field fertility of 11 high-use Australian dairy AI sires. Anim Reprod Sci 2004; 81: 47-61.
  • Corcuera BD, Hernandez-Gil R, De Alba Romero C, Martin Rillo S. Relationship of environment temperature and boar facilities with seminal quality. Livest Prod Sci 2002; 74: 55-62.
  • King GJ, Macpherson JW. A comparison of two methods for boar semen collection. J Anim Sci 1973; 36: 563-565.
  • Kondracki S, Banaszewska D, Wysokińska A, Sadowska A. Ejaculate traits and spermatozoa morphology as related to spermatozoa concentration in ejaculates of Polish Large White boars. Anim Sci Pap Rep 2006; 24: 111-119.
  • Blom E. Studies on seminal vesiculitis in the bull: II. Proposal for a new classification of the spermiogram. Med Weter 1981;37: 239-242.
  • Kondracki S, Banaszewska D, Mielnicka C. The effect of age on the morphometric sperm traits of domestic pigs. Cell Mol Biol Lett 2005; 10: 3-13.
  • Hameed S, Masood S, Zaneb H, Khan MS, Younis M, Avais M, Khan MUR. Dimensional characteristics of spermatozoa of Nili-Ravi Buffalo bulls: seasonal and climatic influences. Turk J Vet Anim Sci 2016, 40: 207-213.
  • Chemineau P, Malpaux B, Brillard JP, Fostier A. Seasonality of reproduction and production in farm fishes, birds and mammals. Animal 2007; 1: 419-432.
  • Auvigne V, Leneveu P, Jehannin C, Peltoniemi O, Salle E. Seasonal infertility in sows: a five year field study to analyze the relative roles of heat stress and photoperiod. Theriogenology 2010; 74: 60-66.
  • Weiler U, Claus R, Dehnhard M, Hofacker S. Influence of the photoperiod and a light reverse program and metabolically active hormones and food intake in domestic pigs compared with a wild boar. Can J Anim Sci 1996; 76: 531-539.
  • Altinsaat Ç, Üner AG, Sulu N, Ergün A. Seasonal variations in serum concentrations of melatonin, testosterone, and progesterone in Arabian horse. Ankara Univ Vet Fak 2009; 56: 19-24.
  • Sancho S, Pinart E, Briz M, Garcia-Gil N, Badia E, Bassols J, Kadar E, Pruneda A, Bussalleu E, Yeste M et al. Semen quality of postpubertal boars during increasing and decreasing natural photoperiods. Theriogenology 2004; 62: 1271-1282.
  • Malmgren L. Experimentally induced testicular alternations in boars: sperm morphology changes in mature and peripubertal boars. Zbl Vet Med A 1989; 36: 411-420.
  • Sarder MJU, Joarder OI, Ali MS, Imam MH. Influence of genetic group, season and age on semen characteristics of breeding bulls. Bangladesh J Genet Biotechnol 2000; 1: 51-57.
  • Tomar S, Gupta HCL. Effect of season on sex desire and semen quality of Hariana bulls. Indian J Anim Health 1984; 19: 37-40.
  • Jasko DJ, Lein DH, Foote RH. The repeatability and effect of season on seminal characteristics and computer-aided sperm analysis in the stallion. Theriogenology 1991; 35: 317-327.
  • Cheon YM, Kim HK, Yang CB, Yi YJ, Park CS. Effect of season influencing semen characteristics, frozen-thawed sperm viability and testosterone concentration in Duroc boars. Asian- Australas J Anim Sci 2002; 15: 500-503.
  • Wettemann RP, Wells ME, Omtvedt IT, Pope CE, Turman EJ. Influence of elevated ambient temperature on reproductive performance of boars. J Anim Sci 1976; 42: 664-669.
  • Stone BA. Heat induced infertility of boars: the interrelationship between depressed sperm output and fertility and an estimation of the critical air temperature above which sperm is impaired. Anim Reprod Sci 1982; 4: 283-299.
  • Mathevon M, Dekkers JCM, Buhr MM. Environmental, management, and genetic factors affecting semen production in French Montbeliard bulls. Livest Sci 1998; 55: 65-77.
  • Nichi M, Bols PEJ, Züge RM, Barnabe VH, Goovaerts IGF, Barnabe RC, Cortada CNM. Seasonal variation in semen quality in Bos indicus and Bos taurus bulls raised under tropical conditions. Theriogenology 2006; 66: 822-828.
  • Flowers WL. Genetic and phenotypic variation in reproductive traits of AI boars. Theriogenology 2008; 70: 1297-1303.
  • Gontarz A, Banaszewska D, Gryzińska M, Andraszek K. Differences in drone sperm morphometry and activity at the beginning and end of the season. Turk J Vet Anim Sci 2016; 40: 598-602.
  • Gomendio M, Roldan ERS. Sperm competition influences sperm size in mammals. P Roy Soc B-Biol Sci 1991; 243: 181- 185.
  • Mossman J, Slate J, Humphries S, Birkhead T. Sperm morphology and velocity are genetically codetermined in the zebra finch. Evolution 2009; 63: 2730-2737.
  • Quintero-Moreno A, Rigau T, Rodriguez-Gil JE. Regression analyses and motile sperm subpopulation structure study as improving tools in boar semen quality analysis. Theriogenology 2004; 61: 673-690.
  • Hirai M, Boersma A, Hoeflich A, Wolf E, Föll J, Aumüller R, Braun AJ. Objectively measured sperm motility and sperm head morphometry in boars ( Sus scrofa ): relation to fertility and seminal plasma growth factors. J Androl 2001; 22: 104- 110.
  • Soderquist L, Janson L, Haard M, Einarsson S. Influence of season, age, breed and some other factors on the variation in sperm morphological abnormalities in Swedish dairy A.I. bulls. Anim Reprod Sci 1996; 44: 91-98.
  • Andersson H, Wallgren M, Rydhmer L, Lundström K, Andersson K, Forsberg M. Photoperiodic effects on pubertal maturation of spermatogenesis, pituitary responsiveness to exogenous GnRH, and expression of boar taint in crossbred boars. Anim Reprod Sci 1998; 54: 121-137.
  • Claus R, Weiler U, Wagner HG. Photoperiodic influences on reproduction of domestic boars. II. Light influences on semen characteristics and libido. Zbl Vet Med A 1985; 32: 99-109.