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Results of meat performance in bulls of various genotype
ŠIMÁK LÍBALOVÁ, Kristýna
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.
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Influence selected factors on growth and carcass quality of fattening bulls
KOCINOVÁ, Marie
The aim of this study was to evaluate the influence selected factors on growth and carcass value of bulls fattened to slaughter weight in the reference herd of Czech Pied cattle breed and its crosses with meat breeds. A total of 70 pieces were observed among breeds of bulls, 32 bulls were of Czech Pied breed, 29 bulls of Czech Pied breed hybrid beef breeds bulls and 9 were crossbred beef cattle. Bulls for fattening were stopped at the age of 9-12 months and were fattened for around two years, 24 months of age.
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Testing of final hybrids by station method
ŠEBEK, Ondřej
Objective of this thesis is prove the testing station of chosen combinations the final hybrids, with regard to interaction of genotype and enviroment.During testing is being watched slaughter weight, weight of the right side at hot, slaughter lenght torso, height of the ridge fat.
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EVALUATE THE PERFORMANCE PARAMETERS OF THE BREEDS OF COMMON CARP AND ITS CROSSBREDS
KŘÍŽ, Michal
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.
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