The aim of this thesis was to evaluate the level of reproductive performance of the Wallachian sheep in the flock of sheep bred by Jan Vejčík. At first the following parameters were evaluated in 457 ewes during the period 2007 - 2011: fertilization, fertility, reproduction intensity, total rearing, infertility, rearing of lambs born and total mortality of lambs. Then, using statistical methods, frequency of litters and effect of age on fertility of ewes were evaluated and the identified parametres were compared with the flocks originating from the Union of sheep and goats of the Czech Republic. Finally, the economy sales for slaughter lambs depending on fertility was assessed. The mean fertility of the flock of sheep reached 171, 77 % and the percentage of fertilization was 92, 54 %. Total breeding flock was 143, 19 %. Seven percent of the sheep was infertile, which is directly influenced by the intensity of reproduction (158,93 %). Mortality of lambs was 10, 03 % and thus survival rate of lambs was 89,97 %. The study shows that the longer the period of existence of a farm is, the higher the fertility of ewes is (almost 179 % in 2011). Also an increasing tendency of the number of sheep twins was recorded during the study (59 twins in 2011). This indicates good welfare of the animals and generally good health of the flock. Ewes reached the highest fertility at the age of 5 to 7 years. The indicators of fertility, reproduction and total intensity of rearing showed significant differences when compared with the flocks originating from the Union of sheep and goats of the Czech Republic. Significantly higher fertility, reproduction and overall intensity was achieved in the monitored flock The difference was not statistically significant (p > 0,05) except for the fertilization parameter. Sales for slaughter lambs per ewe were affected by the share of reactive sheep and total lamb mortality, this effect was, however, only about 20 % of the total dependency. Disregarding the overall mortality of lambs and reactive sheep, it would be true that higher fertility is in direct proportion with sales for slaughter lambs.

The morphological structure of the udder ofsheep is important due to the possible complications of lamb breeding and the use of machine milking. Bad teats position, short teats are problematic in lambing period and milking machin. Lambs can´t findt too big and horizontal teats.

The aim of my diploma work was to evaluate the gains in weight of Walachian lambs based on origin of individual groups of ewes and paternal lines. Based on distribution in accordance with origin of mothers we can say that the biggist weights dutiny weight checks had lambs coming from eves imported from Germany. When comparing average gains in weight in accordance with paternal lines, there is evidence of prevailing bigger achieved weights of Juráš line.

The aim of study was to evaluate milk efficiency of sheep Original Valachian (OV). Observation took place in the period 2006-2009 and were involved 123 ovine. Samples were taken from the morning milking during the months April to August (method ET). Milking proces was realised mechanically. In 84 sheep were known genotypes AA (n = 13), AB (n = 18), BB (n = 53). After evaluation of essential components of ewe{\crq}s milk from flock of lambing ewes OV during lactation were found these average values: Fat (F) 4,90 g.100g-1, crude protein (CP) 5,94 g.100g-1, casein (CAS) 4,40 g.100g-1, serum protein (SP) 1,18 g.100g-1, lactose (L) 5,07 g.100g-1, dry matter (DM) 16,45 g.100g-1, solid not fat (SNF) 11,63 g.100g-1 and utilizable dry matter (UDM) 10,85 g.100g-1. Average daily milk yield of OV was 0,70 l. Effect of stage of lactation was provable on all the indicators in the level of significance 0,001. It was evidenced a statistically significant effect of the control year on the content of SNF (P{<}0,05), on the L (P{<}0,01) and on all other components (P{<}0,001). At comparing milk production OV according to the genetic polymorphism of {$\beta$}-lactoglobulin have been identified probably significant differences in milk yield (P{<}0,05). The highest daily milk yield reached genotype AB (0,76 l.day-1) {>} BB (0,68 l.day-1) {>} AA (0,66 l.day-1). In AB genotype was found the lowest levels of these essential components F, CP, CAS, DM, SNF and UDM. Highly significant effect of genotype was found on content of L (P{<}0,001). The highest content of L was confirmed by genotype BB (5,13 g.100g-1) {>} AB (5,08 g.100g-1) {>} AA (4,91 g.100g-1). Less significant effect was found on SNF (P{<}0,1). The highest average content of SNF was found in genotype BB (11,72 g.100g-1) {>} AA (11,62 g.100g-1) {>} AB (11,54 g.100g-1). In genotype AA was found the highest values of F, CP, CAS, SP, DM. Both genotypes AA, BB showed the same content of DM (16,32 g.100g-1).

Sheep breeding is nowadays a developing branch of agriculture again. There is a lot of different breed and they react distinctly on the same conditions of the enviroment. Sheep of breeds charollais, suffolk, šumavská ovce and valaška bred in similar conditions were observed in spring and autumn of years 2007 and 2008. In these seasons were taking blood samples (from {$\pm$}7{--}24) ewes and lambs and were analyzed in hematology laboratory. There were determined haemoglobin level, haematocrit indicator, erytrocytes and leucocytes levels, glucose, cholesterol, triglycerides levels, urea and plasmatic proteins, activity of ALP and GMT enzymes, phosphor, calcium, magnesium, zinc and copper levels. The main objective of this project was determine seasonal changes in observed parametres. Next objectives were determine different changes in blood parametres in different breeds and different aimes of breeds. There were recognized that all the observed breeds don`t react the same way on similar conditions. There were not provably determined seasonal changes in observed parametres, but average Hb level was higher in autumn than in spring. Urea level was conversely higher in spring season than in autumn. The demostrable fact is, that the similar conditions induce different answers not only in different breeds but also in different aimes of breeds.