The comparison of fattening results of two beef breed bulls

The aim of this bachelor thesis was to compare the growth ability of two beef breeds, namely Aberdeen Angus and Simmental. Monitoring was carried out on Pěčín Angus Farm led by Mr. Lepš, and data was obtained from 30 bulls, of which 17 were Aberdeen Angus and 13 were Simmental. During the first grazing season bulls were at pasture with their mothers, in winter they were housed in wintering, and from April they were at pasture again. Data for the period of two years was collected. The slaughter weight and age, average daily gain and net gain of bulls were detected. Bulls were classified by the year of birth and breed. Within the breed, the year of birth, the meatiness grade and fat cover classification grade (according to SEUROP classification system) were used as other selection criteria. The dates were processed in Microsoft Excel and Statsoft Statistica. In order to evaluate selected factors, basic statistical values were calculated (the number, the mean, the maximum and minimum, the standard deviation), statistical differences were calculated by t-test and F-test. The average weight of bulls born in 2011 was 744.6 kg and was reached at the age of 638 days. The average daily gain of these bulls was 1109.9 g. The average slaughter weight of bulls born in 2012 was lower (713.8 kg) and was reached later (691 days). The average daily gain of these bulls was 987.8 g. The difference in the average daily gain was statistically significant (P 0.01). Slaughter weight 733.3 kg at the age of 688 days and average daily gain of 1019.8 g was observed within group of Aberdeen Angus bulls. The slaughter weight 721.5 kg at the average slaughter age of 637 days was determined within group of Simmental bulls. Their average daily gain was 1077.8 g. The difference between breeds was statistically significant only in the slaughter age whereas Aberdeen Angus bulls were slaughtered 51 days later (688 vs 637 days, P 0.05). Aberdeen Angus bulls were classified as the "U" meatiness grade with an average slaughter weight of 753.0 kg. The bulls of the "R" meatiness grade had lower slaughter weight (703 kg). Simmental bulls of the "U" meatiness grade reached slaughter weight of 731.6 kg, whereas bulls included into the "R" meatiness grade had an average slaughter weight of 709.7 kg