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Problematika výkrmu masného skotu kříženců plemene Charolais a kříženců plemene Limousine
KOSTOHRYZ, Jakub
The aim of this bachelor's thesis was to determine the meat yield of fattening bulls in the same breeding conditions and to analyze the reaction of each breed separately to the same level of nutrition. A total of 43 bulls were selected for evaluation, which passed through the farm in Něchov near Trhové Sviny within two years. Groups of bulls were compared according to the year of slaughter, breed and blood share of the breed. Age at slaughter was ascertained and live weight, carcase, daily gain, net gain and SEUROP classification, conformation and fat cover classes were compared ac-cording to different breeds in the same diet. Data processing was performed using the Microsoft Exel program. The average slaughter weight of Charolais hybrids was 733.98 kg at an average slaughter age of 697 days. It was identical with hybrids of the limousine-Ne breed, which reached an average slaughter weight of 741.65 kg. A larger birth was not found in the average carcass weight, which reached 403 kg in the Charolais breed and 407 kg in the Limousine breed. There was always at least one weaker bull in both groups, as well as a bull that exceeded the average of the others. The weak piece in the Charolais breed included a bull with an average daily gain of 683.59 g / day (av-erage 994.82 g / day) and in the limousine breed 749.6 g / day (average 1005.03 g / day). The strong bull had a net gain of 680.58 g / day (average 579.82 g / day) in the Charolais breed and 720 g / day in the limousine (average 585.25 g / day). The classi-fication of carcasses in the SEUROP system was analyzed according to the propor-tion of blood of individual breeds. Charolais crossbreeds with a charolais> 50% share were 100 % included in the AU2 group, on the contrary, with a charolais 50 % blood content in the AU2 group only in 31 % and the rest belonged to the AR2, AO2 groups and one bull was in the BO2 group, for -they was older than two years. The results did not show a statistically large difference between the individual breeds. The difference between the years was also not statistically significant, which indicates the stability of breeding and nutrition conditions. The only difference was between the groups of the breed with different proportions of blood. Individuals with a charolais> 50 % share achieved a better classification in SEUROP than those with a Charolais blood share lower than charolais 50 %. In the limousine breed, the difference in blood ratio was not so drastic, but bulls with a blood ratio of limousine> 50 % reached 17 % of the AE2 group.
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