Articles | Volume 63, issue 1
https://doi.org/10.5194/aab-63-145-2020
https://doi.org/10.5194/aab-63-145-2020
Original study
 | 
14 May 2020
Original study |  | 14 May 2020

Seasonal variations in quantitative and qualitative sperm characteristics in fertile and subfertile stallions

Yara Suliman, Frank Becker, Armin Tuchscherer, and Klaus Wimmers

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Cited articles

Altinsaat, C., Gokturk Uner, A., Sulu, N., and Ergün, A.: Seasonal variations in serum concentrations of melatonin, testosterone, progesterone in Arabian horse, Ankara Üniv. Vet. Fak. Derg., 56, 19–24, https://doi.org/10.1501/Vetfak_0000002186, 2009. 
Aurich, C.: Reproductive cycles of horses, Anim. Reprod. Sci., 124, 220–228, https://doi.org/10.1016/j.anireprosci.2011.02.005, 2011. 
Blottner, S., Warnke, C., Tuchscherer, A., Heinen, V., and Torner H.: Morphological and functional changes of stallion spermatozoa after cryopreservation during breeding and non-breeding season, Anim Reprod Sci., 65, 75–88, https://doi.org/10.1016/S0378-4320(00)00214-1, 2001. 
Broekhuijse, M. L. W. J., Šoštarić, E., Feitsma, H., and Gadella, B.M.: Application of computer-assisted semen analysis to explain variations in pig fertility, J. Anim. Sci., 90, 779–789, https://doi.org/10.2527/jas.2011-4311, 2011. 
Clay, C. M. and Clay, J. N.: Endocrine and testicular changes associated with season, artificial photoperiod, and the peri-pubertal period in stallions, Vet. Clin. North Am. Equine Pract., 8, 31–56, https://doi.org/10.1016/S0749-0739(17)30465-0, 1992. 
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Short summary
Male fertility is important in horse breeding and depends largely on the quality of the sperm. Horses are seasonal breeders with a natural breeding season that begins in spring and ends in midsummer. This study shows that there is an interaction between seasonal effects and endogenous effects on semen quality and fertility. Semen quality of fertile stallions is more influenced by the seasons than that of subfertile stallions.