Groups of the Czech Pied (C) and Black-Pied (N) cattle breeds were housed in a mosaic pattern in a tie-stall cowshed with individual feeding for comparative fattening. Feed ration was determined so as to provide for daily weight gain of 1,200 g. Fattening performance and indicators of carcass and technological analysis were evaluated, as well as some characteristics of meat quality in a sample of MLD. Meatiness and fat content in dressed carcasses (DC) were assessed by a five-point system after slaughter. Fattening took 223.17 (C) and/or 226.37 (N) days and the bulls reached the average daily weight gains of 1.354 and 1.296 kg, resp., during this fattening. The bulls were slaughtered at the average age of 478.17 and/or 475.93 days while their weight was 525.05 and 516.69 kg, resp. The difference in slaughter weight between the groups (8.37 kg in favor of C bulls) was statistically significant. The level of weight gains in C bulls indicates good feed conversion and the ability of bulls to continue effective fattening to higher slaughter weights. The weight gains of N bulls also suggest that at high fattening intensity the bulls of N breed can also be successfully fattened to the higher slaughter weight than 500 kg. Included slaughter weight (coef. 1.8) (545.88 vs 520.62 kg) increased by 20.8 and/or 3.9 kg; the difference of 25.3 kg between the groups was statistically significant. Subjective evaluation of DCs for meatiness (1.65 vs 2.38) and fat content (2.92 vs 2.18) shows the higher muscle percentage and lower fat content in bulls of C breed; DC weight (303.34 vs 289.36 kg) as well as dressing percentage (57.77 vs 56.00%) and net weight gain (0.575 vs 0.548 kg) are in agreement with the finding of subjective evaluation. The differences between the genotypes in DC weight and dressing percentage were significant. Body measures (determined at 12 months of age and before slaughter) showed significant differences at both measurements in favor of N bulls as for chest depth, pelvis length, anterior and median width of pelvis and as for the posterior width of pelvis at 12 months of age only. A significant difference in favor of C group was determined in the size of leg before slaughter, which indicates its fullness (i.e. better muscle percentage than in N group). Carcass analysis showed that the bulls of C breed had the higher weight of limbs and skin; the bulls of N breed had the intestines and tripe of higher weight. The differences were significant and were as expected. There were no significant differences in head weight. The difference between the groups in the weight of dressed fats in total was not statistically significant; but as to fat deposition, these differences were significant - the bulls of C breeds had more kidney fat while the bulls of N breed had more rumen and intestinal fat. A significant difference between the groups in the weight of right sides of beef was observed in favor of C bulls; significant differences in the yield of meat of prime cuts, meat of quality II and total meat output are in agreement with the latter indicator, both in term of absolute and relative values. Significantly larger - absolute and relative - amounts of bones were observed in the bulls of Black-Pied cattle. There were significant differences between the two genotypes in meat production per 1 kg bones and in meat yield out of the converted weight in favor of C bulls. Insignificant differences were determined in the amount of separable fat, ration of meat of prime cuts and meat of quality II and the layer of subcutaneous fat in loin and sirloin. Physical and chemical characteristics involved these differences: the bulls of C breed had an insignificantly larger eye-muscle area but a significantly lower fat content in loin and sirloin. The other indicators investigated - pH 24, reflectance 685 and contents of dry matter, fat and crude protein in MLD - did not exhibit any differences.
