The goal of this thesis was analyze indicators collected during classification of carcass of final hybrids of pigs. Based on this information it was statistically evaluated a set of animals slaughtered in over a period of 1 year. It was analyzed 65 535 carcasses of pigs at all. Carcasses included in the SEUROP system (64 470 pigs) was divided into 6 the weight interval from 60 to 120 kg in increments of 10 kilos.

Analysis of performance of the Muscovy duck was done based on the results of fattening test carried out by the state enterprise the International Poultry Testing Station in Ústrašice. Ducks (300 pcs) were fed to the age of 70 days and drakes to the age of 84 days. The weight of both ducks and drakes on the 1st day was 50.2 g. On the 21st day the ducks weight 595 g and drakes 621 g (126 g difference). At 49 days of age the weight of the ducks was 1 802 g and the weight of the drakes was 2 589 g (902 g difference). At 70 days the weight of ducks was 2 328 g and at 84 days the weight of drakes was 4 424 g. The average daily gain was 37.7 g for ducks and 58.8 g for drakes (20.3 g difference). The feed consumption required for 1 kg gain was 3 120 g for ducks and 2 970 g for drakes (150 g difference). During the test, only 1 duck died at 55th day of the fattening due to the motion apparatus disease. 20 ducks and 20 drakes were selected for slaughter performance test. The percentage of abdominal fat was 2.8% for ducks and 2.1% for drakes. The slaughter yield was 73.8% for ducks and 73.0% for drakes. The carcass weight was found to be 1 918 g for ducks and 3 462 g for drakes (difference 1.544 g, P < 0.001). The weight of breast muscles with skin was 581 g for ducks and 1046 g for drakes (difference 465 g, P < 0.01). The weight of thigh muscle with skin was 359 g in ducks and 654 g in drakes (difference 295 g, P < 0.001).

There were gaged indexes of 32 fattening cycles of hybrid Topigs and 31 fattening cycles of hybrid Danbred. Starting live weight of hybrid Topigs was 30.1 kg and hybrid Danbred 28.1 kg (P < 0.05). Final live weight of hybrid Topigs was 112.5 kg and hybrid Danbred 114 kg. Average daily gain of hybrid Topigs was 0.81 kg/pcs and hybrid Topigs was 0.9 kg/pcs (P < 0.05). Consumption of complete feed mixture per kilogram of gain of hybrid Topigs was 2.82 kg and hybrid Danbred 2.76 kg. The loss caused by death of pigs in the fattening period was 1.39% f hybrid Topigs was 3.87 % and hybrid Danbred (P < 0.05). There were looked carcass value of 2 374 pcs of hybrid Topigs and 2 468 pcs of hybrid Danbred. Average weight of carcass of hybrid Topigs was 88.1 kg with average part of muscles 57.5%. Average weight of carcass of hybrid Topigs was 91.4 kg (P < 0.05) with average part of muscles 59.1% (P < 0.05). As regards hybrid Topigs, there were classified 12,2% of carcasses in the quality class "S", 72% in the quality class "E" and 15,8% in the quality class "U". And of hybrid Danbred, there were classified 32.9 % of carcasses in the quality class "S", 61,9% in the quality class "E" and 5.2 % in the quality class "U". There were classified 78.5% of hybrid Topigs and 69.7% of hybrid Danbred in weight range 8099.9 kg.

The aim of the study was to determine effect of milk thistle seed cakes in feed mixture for Ross 308 cockerels. The effects to body weight gain, feed conversion, carcass yield, nitrogen retention and biochemical parameters of blood were evaluated. The experimental group (MT40) contained 40% milk thistle seed cakes. It was compared to control group without milk thistle seed cakes. Lower weight gains and higher feed conversion were observed in group MT40 in comparison with the control group. Lower weight gains were probably connected with lower nitrogen retention in MT40 group. On the other hand, the analysis of some blood parameters in MT40 group was favourable, because of stabilization some values. Activity of hepatic enzymes - AST (alanineaminotransferase), ALP (alkaline phosphase) and LD (lactatedehydrogenase) were related to improvement of liver profile and lower damages of other organs like as skeletal muscle.

My thesis addresses gradeation of pig races and how this gradeation influences final hybrids interaction of genotyps and enviroment.. During testing is being watched slaughter weight, weight of the right side at cold, slaughter lenght torso , height of the ridge fat and the area m.l.l.t..

The aim of the thesis was to evaluate the performance parameters of the breeds of common carp and its crossbreds by using the top-crossing. On the maternal position the Hungarian synthetic mirror carp line (HSM) was used. On this line, males of HSM, Telč mirror carp (TeL), Northern mirror carp (M72) and Amur mirror carp (AL) were crossed and a hybrid of Ropsha carp (ROP) and Tata carp (TAT) was used as their control group. Rearing of the tested groups was monitored from larval stage until their market size in ponds with a semi-intensive way of management in three localities (2 organisations). In the first year, each tested group was bred individually with internal control group of a different scaly covering phenotype in order to correct the influence of the environment on the weight achieved. In the second and the third year, all the groups were group-labelled and bred together in triplicate (three ponds) localities. In the individual stages of testing, the weight and the survival rate were recorded. Moreover, in the market size stage the biometric measurement and slaughtering value were evaluated. In the overall assessment of the results from all the localities carried out by the ANCOVA procedure, the highest weight at the K3 age was achieved by the hybrid HSM x AL (1413 {$\pm$} 31.5 g; Last square means {$\pm$} S.E.), whose weight was statistically comparable to the other hybrids (HSM x M72 a HSM x TeL). However, it was the only noticeably higher weight in comparison with the HSM (1257 {$\pm$} 31.5 g) with its ordinary heterosis effect of growth on the level of 12.4%. During the third year of testing, the survival ranged from 69.0 % in HSM x Tel to 73.4% in HSM x AL and the values were statistically comparable. The yield parameters (the proportion of the processed body, the proportion of filets with skin and the skinless ones) were similar in all the groups. In the previous periods of testing the results reflected the situation in the market size. As a result, it is concluded that preferably the hybrid HSM x AL could be exploitable in commercial breeding.

A growing number of pure-bred herds of beef breeds began to grow a herd of cows with a dual-purpose efficiency type, farmers often use their crosses with beef breeds of cattle to increase their meat performance. The aim of this diploma work was to analyse results of fattening ability and carcass value of Czech Pied Cattle bulls (C) and their crosses with beef breeds. In evaluation selected indicators were included 907 slaughtered bulls dividing according their genotype. The software programs Microsoft Excel and Statistica has been used for processing calculations and the statistic data. An important indicator is achieved dressed carcass weight (DCW), which was highest in bulls Meat Siemental (SI) 370.1 kg, Aberdeen Angus (G) 359.0 kg and crossbreeds Charolais and Czech Pied Cattle (TxC) 354.2 kg. Lowest DCW had extensive breed Highland (E) and Galloway (W) 318.8 kg. The difference between SI and E + W was 51.3 kg and was highly statistically significant (P {$\leq$} 0.001). The group of TxC and TxH and breed Piemontese (P) had the highest intensity of growth, net gain was 671.5 g, resp. 669.6 g for T and crosses and 652.5 g for the breed P. The lowest average net gain was found in the breed G (531.3 g). The highest production of first quality meat was found in the breed P (55.6 kg), 55.4 kg was achieved in breed SI. At least meat I. grade was found in bulls of E and W (47.2 kg). Significant difference was found between SI and E + W at a significance level P {$\leq$} 0.001. Based on the results we can recommend commercial crossings Czech Pied cattle with bulls meat breed or breeding pure-bred beef breeds. It is important to take into account the specificity of each breed, its earliness and size of body frame in the choice of slaughter weight and age of fattening bulls, to avoid unwanted growth of fat in bulls, and to realize the slaughter weight trough the most intensive fattening.

The work deals with the influence of the Milk thistle (used substance Silymarin) on the carcass yield of hybrid combinations rabbits Hyla. Hybrid combination Hyla was purposefully bred for meat performance, showing excellent results in breeding. Rabbits behave primarily on meat, because nutritional properties correspond to the current requirements of rational nutrition. Therefore, it is appropriate to increase the carcass yield. The average slaughter yield is indicated from 40 to 53% according to the breed. It was found that the addition of milk thistle in the form of a powder in the complete feedingstuff at a concentration of 0.2% increased the carcass yield, relative to the control group (which was fed only KKS), on average by 0.4%. The group with the addition of 1% showed an average value of 1.2% higher than the group control. The average slaughter yield of all the groups ranged from 54,68 into 63,02%. In both farms also decreased the incidence of diarrheal disease. Silymarin has a favorable effect on the operation and growth of the liver. In the group with the addition of 0.2% increased the average liver weight of 8.1 g, in the group with a concentration of 1% weight on average picked up about 10g. The average weight of the liver varied from 111,19 to 121,20 g. The control group in the case of carcass yield and liver weight showed better results than the authors of their articles.