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CHLÁDEK, G., ŽIŽLAVSKÝ, J.: Comparison of meat performance of Montbeliarde and Czech Pied bulls fattened to live weight of 680 kg. Acta univ. agric. et silvic. Mendel. Brun., 2004, LII, No. 5, pp. 107-114 Czech Pied bulls (C, n=18) and Montbeliarde bulls (M, n=18) were fattened up to the live weight of 680 kg in identical conditions with the aim to compare their meat performance. Mean values of the observed meat performance characteristics were as follows: slaughter weight 682.1 kg, age at slaughter 593.8 days, daily weight gain 1.088 kg, carcass weight 378.2 kg, net weight gain 0.640 kg, dressing percentage 55.4%, weight of hide 59.3 kg, weight of head and tongue 20.6 kg, weight and proportion of kidney fat 14.9 kg and 2.18%, carcass conformation score 3.06, carcass fatness score 2.20 and weight of the right side of carcass 185.9 kg. The weight and proportion of some parts of the right side of carcass were as follows: forequarter 84.1 kg and 45.2%, hindquarter 101.8 kg and 54.8%, total weight of meat 145.5 kg and 78.2%, bones 35.0 kg and 18.9%, separable fat 3.87 kg and 2.08% and hindquarter to forequarter ratio 1.21. Montbeliarde bulls showed a significantly greater (P<0.01) daily weight gain (by 0.107 kg) and net weight gain (by 0.065 kg) and a significantly lower (P<0.01) age at slaughter (by 63.5 days) and weight of head and tongue (by 1 kg), greater (P<0.05) carcass conformation score (by 0.34), hindquarter proportion (by 1%) and hindquarter to forequarter ratio (by 0.05) and a lower (P<0.05) forequarter proportion (by 1%). Our results showed higher growth rate in Montbeliarde bulls; also, their further growth potential was higher than in Czech Pied bulls. The rest of the observed characteristics of meat performance, including carcass composition, were similar in both breeds and were not negatively affected by a high slaughter weight. Czech Pied cattle, Montbeliarde, beef, meat performance, carcass value Ročník LII 11 Číslo 5, 2004 107 Czech Pied cattle, as a dual-purpose breed, play an important role in beef production in the Czech Republic. Lately, milk performance of Czech Pied cattle has been enhanced by improved nutrition (BARTOŇ et al., 1996) and immigration of dairy cattle genes into the population (GOLDA et al., 1988). Consequently, these changes had a negative impact on meat performance of Czech Pied cattle. The aim of breeding is to minimize depression of meat performance and to secure satisfactory feedlot performance and good carcass composition. Therefore, the import of breeding bulls and semen of pied breeds of the Simmental origin has been renewed. French Montbeliarde cattle are one of those breeds. Compared to Czech Pied cattle, breeding of Montbeliarde focuses more on milk performance. Also abroad the attention concentrates on milk performance rather than meat performance of Montbeliarde cattle; it is 108 G. Chládek, J. Žižlavský supposed to have the best dairy parameters out of the dual-purpose breeds of Simmental origin. Therefore, foreign references concerning its meat production are scarce (MIKŠÍK et al., 1996). MORISSE et al. (1990) analysed an internal fat deposition in Montbeliarde bulls with the carcass weight of 315, 341 and 382 kg respectively, with the daily weight gain 995, 1107 and 1193 g respectively. They found a high internal fat deposition in bulls of the same age (21.7–26.4 kg), which tended to grow with increasing growth rate. WARZECHA et al. (1995) compared feedlot performance of Fleckvieh and Montbeliarde bulls fattened up to 715 and 698 kg. The daily weight gains exceeded 1000 g. Both breeds had the same dressing percentage (58.3 %). Fleckvieh got a better conformation score in EUROP classification (2.6–3.0), while the fatness score in both groups was 2.7. GOLDA et al. (1988) compared meat performance of Czech Pied bulls and their crosses with Montbeliarde cattle. The crosses reached the slaughter weight of 575.3 kg at the age of 499.8 days thanks to the daily weight gain 1081 g; dressing percentage was 58.1 %, net weight gain 0.669 kg, weight and proportion of kidney fat 11.0 kg and 3.28 %. The authors found no significant difference between the crosses and pure-bred bulls in the observed meat performance characteristics, except for a higher weight of hide (by 2.2 kg) and a higher growth rate in the period between 151 and 500 days of age (by 174 g) in the crosses. Further analyses (GOLDA et al., 1989) revealed no significant differences in the weight of the right half of carcass (165.6 kg), weight of forequarter and hindquarter (77.9 kg and 87.8 kg), total weight and proportion of meat (133.4 kg and 80.6 %), bones (26.3 kg and 15.9 %) and separable fat (4.5 kg and 2.8 %) in the crosses and purebred animals. MIKŠÍK et al. (1996) evaluated meat performance of Montbeliarde and Czech Pied bulls; subsequent analyses were carried out by ŠUBRT et al. (1997) and ŠUBRT and MIKŠÍK (2002). No interbreed differences were found in the slaughter weight (557 kg and 538 kg), age at slaughter (524 days and 527 days), daily weight gain (1060 g and 987 g), net weight gain (622 g and 588 g), dressing percentage (58.51 % and 57.62 %), weight of hide (49.4 kg and 50.1 kg), weight of head (17.3 kg and 17.2 kg), weight of tongue (0.9 kg and 1.0 kg), carcass conformation score (1.9 and 2.0) and fatness score (1.2 and 1.1). No differences were detected in the weight of the right half of carcass, forequarter and hindquarter (164.2 kg and 153.7 kg, 76.1 kg and 71.7 kg and 88.1 kg and 82.0 kg, respectively) and proportion of meat (77.58 % and 76.74 %). Significantly higher (P<0.05) was only the weight of kidney fat in Czech Pied bulls (6.6 kg compared to 5.1 kg in Montbeliarde) but the proportion of kidney fat did not significantly differ (1.2 % and 0.9 %). The appropriate slaughter weight for Czech Pied bulls ranges between 550 and 650 kg with the optimum of 600 kg (VRCHLABSKÝ et al., 1988). A recent diminishment of the cattle population and a stagnation of prices of slaughter animals resulted in fattening of bulls to greater live weights (in order to maintain a certain level of income). Therefore it is desirable to compare meat performance of bulls of both breeds slaughtered at a higher live weight, i.e. at the weight exceeding 650 kg. ŽUPKA et al. (1985), VRCHLABSKÝ et al. (1988) and BARTOŇ et al. (1996) observed meat performance of bulls slaughtered at a higher live weight. ŽUPKA et al. (1985) analysed meat performance of bulls fattened to 644.3 kg and found the carcass weight 366 kg, proportion of hide 8.87 % and head 3.12 %, weight and proportion of kidney fat 9.65 kg and 1.47 %, proportion of meat 77.06 % and bones 17.56 %. A higher slaughter weight was associated with a lower proportion of head and hide, compared to the bulls slaughtered at lower live weights. VRCHLABSKÝ et al. (1988) compared bulls slaughtered at 706.3 kg and 635.5 kg. A higher slaughter weight was associated with a higher weight and proportion of kidney fat (13.4 kg and 3.16 % vs. 11.6 kg and 3.09 %) and a lower proportion of bones (13.85 % vs. 14.6 %) but the differences were not statistically significant. Significantly higher was only the weight of hide (58.2 kg vs. 53.4 kg) but not the proportion of hide (13.71 % vs. 14.24 %). BARTOŇ et al. (1996) presented meat performance characteristics of bulls slaughtered at the weight of 613.467 kg, at the age of 655.8 days; the daily weight gain was 0.893 kg, dressing percentage 58.907 %, weight and proportion of kidney fat 9.933 kg and 1.617 %, net weight gain 0.551 kg. The weight of hide, head and right side of carcass were 53.8 kg, 19.673 kg and 176.437 kg, respectively. The total weight and proportion of meat, bones and separable fat were 142.168 kg and 80.575 %, 29.915 kg and 16.969 % and 2.790 kg and 1.589 %, respectively. The aim of this study was to compare the meat performance of purebred Montbeliarde and Czech Pied bulls fattened to 680 kg of live weight.