This dissertation provides an overview of the status of critically endangered sterlet in the Czech Republic and in other countries located in the Danube river basin. Results of own research of artificial breeding at experimental and farm conditions are presented. In the results section, focus was placed on most problematic part of artificial reproduction, development, growth and offspring rearing of sterlet in technological aquaculture. The specific objective pursued by the sterlet were: method of non-invasive detection of gas in the digestive tract by radiologic imaging, the effect of different environmental conditions for the presence of gas in the digestive tract and assessment of broodstock for spawning, followed by offspring rearing.

The subject of this thesis is breeding of Icelandic horses and their use in Czech Republic. It describes the history of the breed, its appearance and distinguishing features, as well as its breeding purpose and use. One section of the thesis is dedicated to the description of the Icelandic horses gaits, which include, along others, tölt and skeid. The thesis is focused on the current status of this breed in Czech Republic. Described are farms in our country where this horse is being bred. A further section of the paper consists of survey questionnaire and its subsequent data analysis, an evaluation of the current situation and a summary of the present and schema of the future of breeding of Icelandic horses in Czech Republic. The thesis also includes possible recommendations for breeding these horses.

In the first part of my diploma thesis I am going to theoretically analyze organic farming. I will focus on the principles of organic farming, walfare and organic production. The next topic consists of how to register in the organic farming system, and individual inspecting organizations. The theoretical part will be concluded with evaluation of the organic farming in the Zlin region. In the experimental part I will talk about the Ing. Sluštík – Vladimír organic farm. First, I will introduce the farm, its location, the activities the farm focuses most on, and the machinery that is available and used. I will than carry out the SWOT analysis. Next the opportunities from the analysis will be more detailed and analyzed. Here I will be counting what turnover was reached on the farm in 2017. This amount will be compared with turnovers which could be reached with possible extended activities on the farm, or focus on different activities.

The theoretical part of the thesis contains a literature review of the current knowledge on the occurrence and importance of aquatic invertebrates in salmonid fish farms. The practical part includes monitoring and determination of abundance, diversity and taxonomic composition of aquatic invertebrates in a recirculating system in Pravíkov. Sampling was conducted once a month during the vegetative season over three years, from 2015 to 2017. Samples were taken using an adjusted benthic net, from three sam-pling sites: bottom of the outflow canal from the breeding tanks, bottom of the inflow canal to the breeding tanks and the system’s wall. In addition to the abundance and diversity of aquatic invertebrates, the physico-chemical parameters of water were also measured. During the monitoring period, common breeding interventions were conduct-ed, including the discharge and disinfection of the entire system. During the monitoring period, a total of 36,066 individuals from 133 taxa of aquatic invertebrates were recorded. In 2016, despite the disinfection of the system, the highest number of taxa (74) and abundance (17,700) were registered. In 2016 and 2017, the vast majority of the macrozoobenthos collected were Chironomidae and Oligochaeta, which showed a significant growth in abundance in comparison with 2015. In 2015, 69 taxa with an abundance of 15,436 individuals were recorded. The cleaning of the system showed the highest effect on macrozoobenthos in 2017, when the bryophyte vegetation regrowth did not occur on the wall and some of the samples were without macrozoobenthos. Altogether, only 2,930 aquatic invertebrates and 67 taxa were detected. Values of the Shannon–Weaver index (H´) ranged from 1.335 to 2.214 in 2015, from 0.853 to 2.583 in 2016 and from 1.116 to 2.508 in 2017. Off all macrozoobenthos taxa recorded, Asellus aquaticus presents a potential danger to farmed fish, as it can be an intermediate host of Acanthocephala. This is also true for some species of molluscs, which can be intermediate hosts of trematodes.

Diploma thesis The analysis of key influences on the market production of carcass rabbits dealt with the own experiment in the small breeding of rabbits. The experiment lasted for one calendar year. During the experiment, 34 litters were born and a total of 162 rabbits. The indicators of the impact on meat production were monitored. These aspects include number of cubs in litter, breeds and crossbreeding, average litter increment, average fattening weight at week 20, average carcass weight, and average yield. In the experiment were 75 % of litters slaughtered at week 20 of fattening. Furthermore, the influence of the season on the increment, weight in the 20th week of life and weight of carcass was observed. The best results in terms of average two-week increment reached litter no. 1 where Californian white rabbit and New Zealand white rabbit breeds were crossbred. The average increment of this litter was 375 grams. The average increment in the experiment was 323 grams. This litter also had the highest average weight in the 20th week of life, it was 3460 grams. The average weight of all litters in the 20th week of life was 2858 grams. With a carcass weight of 1900 g and 1800 g, rabbits from litter No.1 (yield 53 % abs and 52 % abs) had the highest carcass weight. The highest yields were achieved in litter no. 10 (pure New Zealand white rabbits) and 62 % abs. The number of cubs in litters varied from three to seven pieces, overall the number of cubs in this experiment was lower. The average in the experiment was 5 pieces per litter. In the experiment, 60 % of female rabbits and 40 % of male were born. In the experiment, no difference was found between the observed parameters in purebred vs. hybrid rabbits. Furthermore, the influence of the seasons on the monitored parameters was not proven; Economic analysis of breeding confirms the authors mentioned in the theoretical part of the thesis that small breeding with 150–200 pieces of bred rabbits per year is intended for hobby breeding. Breeding like this is profitable only in terms of direct costs. In the economic analysis it was found that number of cubs in litter has the largest share of profitability. Other parameters are negligible compared to litter frequency.

My diploma thesis with title Mapping the current situation of breeding the Czechomoravian Belgian Draft Horse (hereinafter ČMB) analyzes the current situation in this breed. I focused on the composition of the ČMB breed, its characteristics and existing difficulties with the breeding on the beginning. I chose questionnaire for the mapping of the current situation in practical part of my diploma thesis. The targeting group were owners, breeders and holders of any gender and any number of ČMB breed horses. Due to this resource I have got the current information about the situation. Thanks to the questionnaire I was searching and getting the numbers of horses owned by one person, the age of the horses, evidence and reason of breeding the ČMB, work in the forest, establishment of the breeding, mating the mares, requests for stallions, breeding, foals, subsidy programs and planning of breeders in 2017. I analyze and summarize the information which I have got from the questionnaires and described the results.

This diploma thesis focuses on monitoring the growth of warmblood foals. The aim was to evaluate growth allometry, hippometric indexes and correlation dependence between individual body measurements; furthermore, to statistically assess the growth of foals in relation to certain factors (sexual dimorphism, breeder, year of birth, birth order, sire) and to compare the values obtained with growth standards and growth ranges for warmblood horses. Three breeding farms from the South Moravian region were included in the study. The measuring of the foals was carried out between 2013 and 2016, from birth to three years of age, once per month using measuring devices (a measuring stick and tape). The measurements taken were: stick height at withers, tape height at withers, chest circumference, body length and cannon bone circumference. The results indicated that colts are much more susceptible than fillies to the negative effects of external factors and have more difficulty withstanding them. However, the growth rate of colts was higher for all the dimensions assessed. Throughout the monitoring period, fillies exhibited a higher trunk size index, which is a result of the anticipated development of the foetus in adulthood. Due to the demonstrably heavier frame of colts, the cannon bone load index was found to be higher in fillies. The highest growth capability was achieved at the Velké Němčice breeding farm, where foals appear to be provided with the optimal conditions for growth and development. Furthermore, it was established that foals born as the 4th or 5th foal exhibit the highest growth rate. This result can be attributed to the fact that mares (dams) have reached physical maturity and are capable of meeting the needs of foals. Conversely, the weakest growth was achieved with foals born as the 1st, 3rd or 6th foal. After assessing the values obtained against the growth standards, we decided to retain the existing ones with an emphasis on breeders regularly monitoring the growth and development of foals.

Maraena whitefish and peled are considered to be economically important fish species. This Ph.D. thesis deals with testing of selected aspects which show potential for improvement of quality and effectivity of larvae and juveniles of both fish species in recirculating aquaculture systems. The whole Ph.D. thesis includes 9 chapters described in 125 pages. In chapters 2-8, there are described the individual factors which can influence quality of intensive rearing of mentioned fish species. The effect of light intensity and tank wall colour on growth and survival of peled larvae is tested in chapter 2. The effect of different temperature on growth and survival of maraena whitefish larvae is presented in chapter 3. The effect of various stocking density on growth and survival of maraena whitefish larvae is given in chapter 4. The influence of different feeding strategy on survival, growth, and intestine and liver development of maraena whitefish larvae is being shown in chapter 5. The effect of various weaning time and co-feeding duration on growth and survival of peled larvae is described in chapter 6. The effect of variable water oxygen saturation on growth and haematological profile of peled juveniles is shown in chapter 7. The prevalence of deformities in intensively reared peled and comparative morphometry in intensively reared fish compared to pond-reared fish is described in chapter 8. Ph.D. thesis contains important advices which can be used in fishery practise and at the same time they can prevent from elevated fish mortality.

The whole Ph.D. thesis includes in total 10 chapters on 146 pages. Chapter 2 9 are specific parts of thesis where following scientific and practical aspects of pikeperch reproduction biology and aquaculture are described. Quality and quantity of pikeperch spermatozoa after varying cold water treatments are presented in the chapter 2 and can help to optimize broodstock management of males with the aim to obtain high quality spermatozoa during a seasonal and an out of season spawning as well. Benefits of hormone treatment of both sexes in semi-artificial reproduction in pikeperch are described in the chapter 3 where the importance of hormonal treatment of both sexes in tank spawning is evaluated for effective production pikeperch larvae. The use of an alcalase treatment for the elimination of pikeperch egg stickiness is being shown in the chapter 4 of this thesis. Post-ovulatory oocyte ageing and its effect on eggs viability rates and occurrence of larval malformations and ploidy anomalies are listed in chapter 5. These results describe the effects of the egg over ripening fertilization process in pikeperch. The first report of heat shock triploidisation in pikeperch is described in chapter 6 with production of 100% pikeperch triploid population. The effect of water surface treatment on survival, swim bladder inflation and growth of larvae is given in the chapter 7 with the aim to optimize the intensive culture of pikeperch larvae. Last two chapters (8 and 9) are describing the adaptation of intensively cultured juveniles to pond culture and the adaptation of pond-cultured juveniles to RAS as a new and effective methods for ongrowing production of pikeperch. In total, four published scientific papers, one handbook, one accepted scientific paper for publication, and two prepared scientific manuscripts are included and discussed in this Ph.D. thesis.

The aim of the thesis was to evaluate productivity of the final hybrids laying type of hens Isa Brown and Bovans Brown in different housing systems on the basis of data provided by the International Poultry Testing Station in Ústrašice. Monitoring performance of the final hybrid laying type hens consisted of rearing pullets until the age of 126 days and the laying period to 518 days of age. Hatching eggs of Isa Brown hybrid for keeping in cages had significantly higher weight and fertilization, but lower hatchability of fertilized eggs than for keeping on litter. Hybrid Bovans Brown eggs for hatching intended for keeping in cages had lower weight and lower fertilization and hatching rate of fertilized eggs than eggs for keeping on litter. At the end of 18th week of rearing of pullets Isa Brown and Bovans Brown reared in cages had significantly lower body weight compared to pullets reared on litter. In pullets housed in cages feed consumption in 126 days was significantly higher compared with pullets reared on litter. During the rearing of pullets mortality was not recorded. Hybrid Isa Brown showed a higher body weight if kept in cages while hybrid Bovans Brown on litter. Both hybrids in battery cages had lower feed consumption per 1 egg and 1 feeding day. For the observed period was found higher mortality in chickens kept in cages than on litter. Hens housed in cages had lower egg production at the initial state. Both hybrids housed in cages had significantly lower intensity of laying during the first period than the laying hens housed on litter. Differences in the 2nd laying period were slight. Hens housed in battery cages achieved the highest egg weight in the mid-laying cycle, i.e. in the 7th the laying period. Conversely hen housed on litter achieved the highest egg weight at the end of the laying cycle, and 13th, respectively 14th the laying period. Shell strength gradually decreased with age in both housing systems.