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Faktory ovlivňující množství spermií v ejakulátu kanců
ŠTVERÁK, Martin
In the reproduction of pigs we have been seeing for long time seasonal and sudden declines in the production of piglets. But there are no completely known specific influencing factors or the extent of their impact on fertility of sows and boars. There are many studies dealing with the causes of decline of showing the estrus of sows and boars reducing sperm quality, but even in the educational literature or professional breeders discussions is not enough space dedicated to reducing the quantity of semen of boars. The number of sperm cells in the ejaculate plays an important role in fertilization and also has a direct impact on the smooth running of boar AI center and thus their clients. The aim of the study was to evaluate sperm counts of observed boars under the influence of the seasons and compare them with the ideal values. All the data of the number of sperm of observed boars from the years 2006 2010 were divided into groups based on the date when sperm collection was conducted. These groups were then compared statistically among themselves in terms of the average total quantity of sperm cells in the ejaculate, average sperm concentration and average volume of ejaculate. The average total number of sperm cells reached the highest values in winter, the second best results was evaluated in the fall, which was not too far from the spring results that have achieved satisfactory values. The lowest total sperm count was recorded in the summer but even these low values are according to professional literature in the standard. The average sperm concentration peaked again in the winter, but this time with a relatively small margin before spring, which also showed excellent results. Worse values were achieved in the fall and the lowest results from all fell back for the summer. Some sources even stated that the results for the fall and summer are below standard. For ejaculate volume was surprisingly best evaluated fall, but with only a slight difference the second best quality has been reached in winter. Compared to the results of the concentration of sperm cells in the ejaculate volume were recorded relatively low values in the spring, but the worst results were, as expected, again in the summer. The results show that factors related to the ongoing season have undeniable impact on sperm production of breeding boars, these factors have somewhat different effect on semen volume and sperm concentration. By all accounts, the best time to reproduce is the winter and the least favourable time is summer.
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