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The aim of this diploma thesis is to choose important reproductive parameters of sows from the available data, according to which it would be possible to statistically evaluate achieved reproductive level of analysed breed. It is necessary to define these parameters as accurately as possible with the shortest time required for measuring and collecting data. In the reproductive company SPV Plevnice were chosen 110 sows from different litters for the purpose of experiment. The day of weaning was on the 5th August 2015 and the sows were separated into 8 groups according to the order of actual litter, sow genotype and boar genotype, used for sow insemination. 13 basic reproductive parameters and 10 reproductive parameters reflecting sow genotype (BLBA x BAL) and boar genotype (4 breeds) BLBA = Czech large white x Landrace x Topigs, BAL = Czech large white x Landrase x Topigs x DanBred. The average value of born company piglets was 13,94. More specifically, total number of livebirths was 13,25 and total number of stillbirths was 0,68, which represents 4,88% of whole litter. Average number of weaned piglets per one sow and one litter was 12,16 with the loss of 1,06 piglet and statistical signifikance of risk and producing (p = 0,0436). The pregnancy rate after the first insemination reaches 89,82% and is influenced by average number of unproductive days 10,84 days. All these factors (including average lactation period of 27,06 days) forms meantime (154,03) with turnover 2,37 litters per year. As the most important factor is considered the indicator of weaned piglets per year, which in this case reaches 28,82 piglets/sow per year. In the next chapter there were given parameters in the term of old sow BLBA genotype and BAL genotype compared. In the next chapter the same comparation was used for boars. The impact of the breed was the best at sows of the last reproductive season, when the best boar L1536 had the highest number of livebirths with the average breeding loss (-1,1) 12,28 weaned piglets. Practically the same results had L1538 boar. However, in this case the number of livebirths was very low, so that the number of nurse sows was higher. The youngest L25 boar has the highest number of livebirths/sow per year, however concurrently the highest losses to weaning and therefore least weaned piglets in comparison with other boars. In terms of the distribution of the season, the worst results for the summer season (12.7 piglets born alive / litter).

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The disertation analyses the possibility of influencing reproduction and production paramatres of gilts and sows with the addition of 2 % conjugated linoleic acid in feed mixtures in operating conditions of a production pig farm. The evaluation of mean achieved daily growth for the time from birth to the end of the test confirmed higher values for gilts in the experimental group. Within other parametres of efficiency of gilts, ie. the lean meat rate, backfat thickness and the depth of MLLT muscle, no significant influence of CLA on their phenotypic manifestation was found. On the basis of gained results it can be concluded, that the supplementation of CLA decreases the mean age of gilts at the time of their first serving. At the same time, the age of first farrowing was lower in the experimental group. Evaluation of reproductive performance parametres revealed a tendency of reaching better results in the experimental group, however without statistically significant differences. In the another part of this study, the sows of the experimental group had provably longer gravidity, the birth weight of piglets was not affected. Results of the experiment show significantly higher number of reared piglets in the experimental group of sows and related level of piglet losses from birth to weaning. Growth ability of piglets from birth to weaning do not show any significant effect. The aim was also to evaluate whether CLA administered to sows during lactation influences an inclusion to next reproductive cycle. Shorter interval of estrus onset was found in the group of sows with compound feed enriched with conjugated linoleic acid. Although the results of conception of sows after weaning pigltes speaks in favour of the experimental group, no significant difference was proved.

The aim of this diploma thesis was to analyze reproductive performance of sows in the selected breed. In this breed, data was collected in the year 2016 and early 2017. The basic statistical characteristics were monitored for the number of all pigs born, the number of live births and the number of weaned piglets evaluated for the influence of litter rank and the influence of the boar used. The test data was tested by paired t-test. The total number of sows with reproductive parameters was number 63. The number of live piglets in the monitored period was 12.9 pieces / litter. The indicator of the number of weaned piglets was 11.9 pieces / litter. The highest average number of live-born piglets was 36 for boar, but for the change had the highest piglet losses against other boars. The litter's influences on the number of live-born piglets was 12.8 pieces / litter in the 2nd litter and in the 3rd litter 13.5 pieces / litter, this difference was statistically significant. It follows that the highest average number of live piglets in litter rank was reached on the third litter order.

The master´s thesis analyzes factors impacting on efficiency of sows and mortality of piglets. The data evaluated in this thesis comes from 54 sows and 513 piglets they farrowed. It focuses on impact of particular factors on length of meantime, order of litters, birth weight of piglets, litter size, hybrid combination and individuality of the boar. Longer meantime have shown a trend of increased number of stillborn pigs and higher parity has shown shortening of meantime. Statistically highly demonstrable difference (p < 0,01) can be seen between the sixth and higher litters and the third litter. Statistically demonstrable difference can be seen between the fifth and the third litter (p < 0,05). Higher birth weight has shown decreased losses of piglets. At the same time a negative correlation has been observed between the litter size and the birth weight, resulting in proving a statistically highly demonstrable difference in the number of all born, live born and weaned piglets between the group of the heaviest subjects and the groups of lighter ones. While observing differences in hybrid combinations (CLW x CL) x CLW sire line and (CLW x CL) x D, considerably higher losses of piglets have been observed in the first group and while observing the impact of individual boars, notable differences in weight and losses of young pigs have been observed.

The aim of this thesis was to evaluate the reproductive performance parametres in sows in selected herd of the years 2010, 2012 and 2013. In the year 2011, the selected herd has been repopulated, therefore the results from this year are not included in this work. There were observed phenotypic levels of selected reproductive parametres, namely the total number of born piglets, the number of live -- born piglets, the number of reared piglets, the comparison among parities. Further, there were evaluated the loss of piglets, lenght of meantime and rate of conception of sows. The obtained results indicate that the best results of the reproductive performance parametres in sows was reached in the year 2013, namely 33.6 pcs of total born piglets/sow/year (14.26 pcs/litter), 30.7 pcs of live -- born piglets/sow/year (13.03 pcs/litter) and 26.4 pcs of reared piglets/sow/year (11.21 pcs/litter). In comparison of parities, the best results were found on the third and subsequent litters, namely 14.76 pcs of total born piglets/litter and 13.64 pcs of live -- born piglets/litter in the year 2012. The highest number of reared piglets was found on the second litter in the year 2013, namely 11.57 pcs/litter. The evaluation of losses of piglets, the highest level of losses of live -- born piglets was found in the year 2013 (14 %). The highest share of losses of piglets from birth to weaning accounted piglets with low birth weight. In selected herd, the measures have been taken to minimize loss of piglets, five percent at least. In the evaluation of lenght of meantime, there was found the shortest length in the year 2012, namely 149.5 days. The best rate of conception of sows was found in the year 2013, namely 94.6 % after the first insemination.

The aim of the dissertation thesis was to analyze reproductive performance of sows recovered by the means of repopulation, in operating conditions of a production farm. Another objective was to analyze productive parameters of piglets and losses of piglets from birth to weaning. Based on achieved results it can be stated, that repopulated group of sows showed significantly higher reproductive performance compared to sows before repopulation. An anylsis of reproductive performance of gilts coming from two commercial programs was also conducted. The differences in reproductive performance were not found significant, however the differences in the losses of piglets were significant in favor of the program II. From the analysis of the productive parameters of piglets it is evident that piglets in the commercial program I had better growth intensity compared to piglets in the commercial program II, demonstrated by significantly higher weaning weight and daily gain of piglets. Also reproductive performance of repopulated sows from the 1st to the 4th litter was analyzed. The results indicate that there is a significant difference between parities. Reproductive performance had increasing tendency up to the 3rd litter and in the 4th litter it decreased. The most frequent causes of discarding of sows were problems with musculoskeletal system and abortions.

The goal of the thesis was to analyse the reproductive performance of sows at a selected farm during years of 2011 - 2015. As a main performance indicator we picked a number of live born piglets per sow and litter. Average number of born alive piglets per litter was 12.54. Highest average was reached by Large White breed with 12.70 piglets in a single parity. Highest average over observed period occurred in 2012 with 13.07 live born piglets. Most productive month was May with 12.81 piglets per parity.First parity produced least amount of piglets (11.94), this metric increased until 4th litter to 13.11, and since 5th parity the parity number slowly decreased. Sows with a shorter farrowing interval (under 145 days) exhibited slightly lower fertility than sows with a longer interval (12.64 and 12.75 live born piglets/parity respectively), the difference being 0.11 piglets per sow. Measuring the effect of length of weaning-to-conception interval, sows with interval of 5 or less days produced more live-born piglets per parity (12.69) than sows with interval of 6 and more days (12.55). As for effect of gestation length, sows with shorter gestation (114 days or less) farrowed more piglets (13.10) than sows with longer gestation (115 days and more 12.14 piglets). Examining gilts, the ones mated in earlier age (under 8.3 months) had smaller average litter size of 11.80 piglets vs. 12.29 piglets for gilts mated after 8.3 months. For 92.05 % of observed sows, a single mating was sufficient, and these had higher farrowing rate of 12.55 vs. 12.35 for sows requiring repeated mating.

Goal of this work was to analyse performance on specific farm. For this evaluation we chose a period since 2011 to 2015. Data were later compared acording to years and quarters. Production and reproduction indicators were evaluated. In reproduction indicators were analysed succes of insemination and number of piglets, specifically, number of all born piglets, number of alive and stilborn piglets, and number of bred piglets. During evaluation of insemination succes we concluded, that, the best performance was achieved in 2015, when 84,9% of inseminated females were gravid. We also concluded that gilts and swines get pregnant better at autumn. When we evaluated litters, it was concluded, that that in 2014 swines had 15,23 born piglets in average. With production indicators we found out, that in 2013 there were the biggest average daily agains (0,465 kg). The largest agains were recorded in the winter. The smallest perishing rate was in 2012 where 1,76% perished in average. In fattening, the smallest daily gain happened in 2013 (0,872 kg). The smallest intake of feed was in 2011 when we recorded 2,695 kilograms of feed per kilogram of gain.