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Vybrané aspekty souhrnného selekčního indexu v populacích strakatého skotu
Kopec, Tomáš
The aim of this study was to estimate genetic correlations between traits using breeding values and to propose a total merit index for bulls and cows of Czech Fleckvieh cattle on the basis of these correlation. Genetic correlation was estimated from de-regressed proofs. REML procedure was used for determining components of variance. The basic database included 785 breeding values of bulls of Czech Fleckvieh and 441 of Fleckvieh (German and Austrian population). Estimated genetic standard deviations were similar to the standard deviations of breeding values and they always had a higher value. The genetic correlations were similar to correlations of breeding values as well. The genetic correlations matrix showed that the relationships were mostly within particular groups of traits. There were correlations 0,79 - 0,93 among milk production traits and 0,41 - 0,59 among beef production traits. Estimated genetic correlations, breeding values correlations and economic weights set by Wolfová et al. (2007) were used for construction of selection index for Czech bulls. Milk production has 45 %, beef 24 %, exterior 16 % and fitness 15 % within this total merit index. The total monetary gain is divided as follows: 86,7 % for milk production, 5,13 % for beef traits and 8,08 % for fitness. Reliability of this total merit index is 0,86. The total merit index for cows has as the same composition as the index of bulls; the missing breeding values (fertility, calving ease and longevity) were computed using genetic correlations estimated for bulls. In conclusion, incorporation of new breeding values will increase the genetic level of fitness traits. Estimation of genomic breeding values for milk and fitness allows obtaining reliable breeding value earlier.
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Analysis of the performance of beef cattle herds
ŠEBELKA, Štěpán
The aim of this thesis was to evaluate the chosen effects of control of performance on the growth of calves in the most common meat breeds of the South Bohemian region (Aberdeen Angus, Charolais, Limousine, Beef Simmental) involved in the monitoring of performance of beef cattle during the period 2009 - 2014. The aim of this thesis was to evaluate what influences affect the weight of beef calves during their rearing. When comparing the average weight of calves according to breed, the highest weight at birth were (42.37 kg), at 120 days (191.32 kg), at 210 days (307.65 kg) and at 365 days (503.53 kg) with the Charolais breed. When examining the influence of year of calving at the birth weight at 120, 210, and 365 days, it was found that calves of Limousine breed clearly reached the highest weight in 2012 in all age categories. In determining the effect of month of calving for the birth weight at 120 and 210 days of age, the best months are December to March for Aberdeen Angus and April was the best month for calving for Beef Simmental. The period of calving is going from winter until spring months. Aberdeen Angus cows up to the fifth calving make up 73.29 % of the herd. When examining the influence of calving order to calves weighing at 120, 210 and 365 days of age, the worst of all breeds are calves from the first calving. At 120 and 210 days of age, Aberdeen Angus calves were at the highest weight with the 6th calving, Limousine breed were at the highest weight of calves with the 9th calving. At 365 days of age, Aberdeen Angus calves had the highest weight with the third calving. Rearing management breed is clearly the best with breeders who participate in national exhibitions and produce bulls and heifers. Relative breeding values of the Fathers for Direct effect - growth (Peru) and relative breeding values for maternal maternal effect - growth (Meru), have verifiable affect on the weight of calves
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The processing of the cold-blooded stallions catalogue
RAJŠLOVÁ, Jana
The bachelor thesis deals with the processing of the cold-blooded stallions catalogue, which should help to breeders in selecting of a stallion. The main sources for the bachelor thesis were especially catalogues published by breeding organisations in the Czech Republic together with catalogues provided by organisations in other countries. As other sources have also been used catalogues with breeding bulls, especially for a very sophisticated estimates of the breeding values. When comparing the dates provided by various organisations, it was found that in none of Czech catalogues are not the results of the breeding value estimations. In contrast, in the current world it is common to state the breeding values for dressage, jumping, exterior and sometimes also physical dimensions with the sport horses. Mostly are these breeding values completed with a graph. That is why the breeding values for linear features of the exterior description together with the graph adequate to these values were complemented into the design of the cold-blooded stallions catalogue, so that the breeders can compare individual stallions and choose the most suitable one. In conclusion, the established results were evaluated and the methods which follows to improvement of the catalogue in the Czech Republic were suggested. Mainly which information is important to fill into the catalogue and in which period the catalogue should be actualised.
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