The aim of this thesis was to analyze the losses of piglets in pig utility breeding. On the selected farm was made the following experiment: for 4 hybrid combinations was assessed a total of 117 litters of sows. There were monitored basic statistical characteristics (number of all born piglets, number of live born and also number of weaned piglets). The effect of hybrid combination, the litter order and boar impact were evaluated for them. The best results in number of all born piglets (11.00 pc) were achieved for the hybrid combination number 2. The highest number of live born and surviving piglets (10.6 pc and 10.4 pc) was for the hybrid combination number 4. The lowest results in all measured categories (10.08 pc, 9.9 pc and 9.2 pc) were achieved for the hybrid combination number 1. The highest number of all born piglets per litter order for all the hybrid combinations was achieved at the fifth litter order. The highest number of live born and surviving piglets was at the third litter. The lowest number of all born piglets was at the tenth litter. At the eighth litter was the lowest number of live born and surviving piglets. The highest number of all born piglets was recorded with the boar AEG 26, that belongs to the hybrid combination number 1. Moreover that boar had the highest number of live born piglets. However, the highest average number of all weaned piglets is achieved with the boar HYB 140 from the hybrid group number 2. The lowest average number of all born, live born and weaned piglets is with the boar ALT 163, that also comes from the hybrid combination number 1.

The aim of this thesis was to compare the reproductive performance of sows on two farms within a selected company, which is engaged in breeding pigs. There were observed phenotypic level of selected reproductive parameters, namely the total number of piglets born, number of piglets born alive and number of weaned piglets. These reproductive performance were also compared depending on the order of litters and the length of pregnancy. The evaluation of the results we can say that the best reproduction performance were achieved in 2014 on a farm A, namely 15,00 pcs of all born piglets per litter. Live born and weaned piglets per litter were found most in 2015 on a farm B, namely 12.56 pcs / litter of live born piglets and weaned piglets - 11.67 pcs / litter. In comparison reproductive performance in the sequence of litter in the number of live born piglets were the best third and subsequent litters on the farm A - 14.66 piglets per litter. The most live born piglets were found in the third and subsequent litters on the farm B - 12.58 piglets per litter. The highest number of weaned piglets were found again in third and subsequent litters, namely 11.64 piglets per litter on the farm B. The evaluation of influence of the length of pregnancy on the reproductive performance is obvious that the best results in all parameters was achieved at a length of pregnancy in the interval from 111 to 113 days. All born piglets per litter were found 15.2 pcs / litter on the farm A and live born piglets per litter were the most on the farm B - 12.55 pcs / litter. The most weaned piglets were found on the farm B - 11,70 pcs / litter. Losses of piglets from birth to weaning were recorded at least on the farm A in 2015 - 5.73% of piglets born alive and on the farm B in 2014 - 6.69%. Depending on the order of litter was the best result achieved at the farm and for sows in the second litter, when losses were recorded only 0.09% of piglets born alive. The best result of losses in relation to the length of pregnancy was achieved on farms A 3.24% at the length of pregnancy in the interval from 117 to 119 days

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The diploma paper was focused on evaluation of chosen factors that influences loss of piglets since birth to weaning. Experiment was run in pre-chosen breeding herd on 80 sows of two genotypes A and B. The influence of genotype was evaluated for loss of piglet, then it´s influence on birth weight and sex, and for genotype A lose based on order of litter. There was statistically proven difference between genotypes in loss of piglets for litter. For genotype A the loss for litters was 1, 49 piglets and for genotype B it was 0,84 piglets for litter. There was also valid statistics prove of positive correlation between number of piglets that were born alive and number of reared piglets, however highly provable positive correlation between number of piglets born in litter and lose of piglets before weaning was established only for genotype A. When gender taken into account higher mortality of female piglet for genotype A 9,22 % than for genotype B 3,76 %. In case of male piglet the difference was not so striking 10,92 % for genotype A and 7,37 % for genotype B. The overall loss of male piglets was 5,31 % higher than for females piglets. Average postnatal weight of dead piglets did not differ for both genotypes too much (1,06 kg A, 1,02 kg B). Statistically unprovable difference was established for evaluation of postnatal weigh of dead piglets with opposite sex. During evaluation of number of piglets born alive in litter based on order of litter was established statistically provable difference between the first and the third litter and highly statistically provable difference between the second litter and the third litter. There was highly provable statistic difference in number of reared piglets between the third and the fourth litter. Highly provable statistic difference in number of dead piglets on litter between the first and the fourth litter and also between the second and the fourth litter was established. In a lose percentage was established statistically provable difference only between the second and the fourth litter.

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).

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.

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.