关键词:
bulls
commercial crosses
fattening
growth rate
meat quality
摘要:
The study was performed on 55 young purebred Black-and-White (BW) bulls and 73 bulls being commercial crossbreds of BW with beef cattle. Daily live weight gain from 990 to 927 g was found related to a higher dressing percentage, ranging from 58.3% in crossbreds to 55.9% in pure BW bulls. Meat from crossbreds showed, with no reference to slaughter age and genotype, a pH(48) higher (5.79) than that found in purebred BW bulls. More intensive growth rate, regardless of age of the bulls, led to the lighter meat colour (Hunter-L;29.6-27.5) and saturation with red (Hunter-a;18.7-15.3). A much greater diameter of longissimus dorsi (LD) muscle fibres was observed in meat from older animals (35.6-56.5 mu m) as well as from those showing higher live weight gain, where the difference in the fibre size reached 16.7 mu m. A higher growth rate also resulted in a higher content of FTO and FTG fibres.