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Analýza morfologických změn spermií kanců a jejich vliv na plodnost prasnic
ŠTVERÁK, Martin
The aim of the work was to evaluate the quality of boar ejaculate in terms of sperm morphology and the influence on fertility of sows. The data came from 58 sperm collections from 8 boars of one line. The boars were housed in the semen collection centre under the same conditions and were in age from 11 to 21 months. In the ejaculate analysis, the evaluation of the pathologically changed sperms was performed by determining the frequency of the finding of individual morphological changes. To evaluate the effect of semen on the litter size, data from 123 successful inseminations and subsequent births were processed. The results showed that boars in most cases produced ejaculate with an average volume with a lower sperm concentration. The incidence of morphologically abnormal sperms was normal for almost all boars. The most common sperm abnormalities were immature sperms and defects of sperm flagella. It was confirmed that more piglets were born after using insemination doses made from sperm ejaculate with the higher sperm count. Furthermore, when using ejaculate with a morphologically abnormal sperm count below 15%, more piglets were born than when the sperm count was 1525%. In the case of immature sperms, a negative correlation with the number of born piglets has been proven.
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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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Viral marketing on the Internet
Štverák, Martin ; Šalamon, Tomáš (advisor) ; Svatoš, Oleg (referee)
Thesis provides an overview of viral marketing. It describes the process by which you can be inspired to implement viral campaign. The thesis includes analysis of specific viral Web project. The aim of this thesis is to create a breakdown of the various components of viral marketing, to establish conditions that should be satisfied for the viral marketing to success, suggesting how to use viral marketing on social network Facebook and evaluate the various components of this service for the promotion possibilities, to analyze own viral projects and map out the key factors for their success. The main benefit of the thesis is to provide basic information about viral marketing, an overview of the use of Facebook services for viral marketing and viral analysis of running applications and their resulting knowledge.
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Virtuální komunity - jejich podpora prostřednictvím IS/ICT, způsoby organizace a motivace
Štverák, Martin ; Šalamon, Tomáš (advisor) ; Svatoš, Oleg (referee)
Tato práce se zabývá Virtuálními komunitami, obecně popisuje oblast virtuálních komunit a většina práce je zaměřena na komunitní webové servery. Cílem práce je zmapovat prostředí a formy komunikace virtuálních komunit a pokusit se je kategorizovat podle různých kritérií. Celá práce poskytuje rozhled čtenáři, jenž se chce pokusit založit komunitní webový server a tím zmírnit riziko jeho neúspěchu. Práce má za cíl zabývat se také propagací komunitních webových serverů, upozornit na některé zajímavé aspekty propagace na Internetu. Cílem práce je také objasnit nákladovou a výnosovou stránku projektů komunitních serverů, představit a navrhnout zajímavé výnosové modely. Autorův hlavní přínos spočívá v analýze motivací a stanovení zásad a poznatků, které by měl dodržet, každý podnikatel, když se pokouší rozjíždět projekt komunitního webového serveru. V práci jsou zužitkovány praktické zkušenostmi autora v oblasti virtuálních komunit a marketingu v prostředí Internetu.
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