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Richard Bach
Výzkum
An effect of heat stress on antioxidant activity and quality of ejaculate of boars
The quality of ejaculate varies significantly during the season. The highest fluctuations are observed in all species of male livestock in the summer months at higher temperatures (Pinart et al. 2013). Also stress itself may influence the body temperature (Jancikova et al. 2012b, Vinkers et al. 2013).
Quality of ejaculate of boars decreases at increased heat load. A reduction of motility and concentration of sperms as well as an increase of percentage of abnormal sperm have been recorded (Martin-Hidalgo et al. 2013). Reduced sperm motility is caused by a lower level of ATP (Nevrkla et al. 2012, Gogol 2013, Nevrkla et al. 2013). In the boars, the quality of ejaculate is largely influenced by season. The best quality of ejaculate is observed in spring and autumn. Conversely, in the summer, when the animals are exposed to high temperatures, significantly worse qualitative and quantitative indicators of the ejaculate are recorded. An influence of breed has also been recorded (Tretipskul et al. 2012, Horky 2014). High temperature may also cause an excessive loading the organism with oxygen radicals and decrease in activity of antioxidant enzymes (dos Santos et al. 2013). In some cases, overproduction of free radicals causes a damage of biomolecules and cancer (Vyslouzilova et al. 2013) (Pohanka et al. 2013). Reactive oxygen species (Belakova et al. 2014) negatively affect the quality of sperms. Negative impact of these reactive oxygen species causes peroxidation of lipids that create the outer shell of sperms (Ashrafi et al. 2013). Reactive oxygen species may affect the metabolism of proteins in the ejaculate (Hadaš et al. 2012, Sharma et al. 2013). High temperature also affects the reproductive performance of breeding pigs (Prunier et al. 1997, Horky et al. 2012b).
The aim of this experiment was to evaluate an effect of heat stress on biochemical parameters of ejaculate of breeding boars in terms of changes in antioxidant status. The operational objective was to evaluate the effect of the thermal stress on the qualitative parameters of produced ejaculate.
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