According to Table 2, there are different reports about pH values of the m. pectoralis major of broilers (15 minutes after slaughter). The strictest were Ristic and Schön, Taylor and Jones, and Ristic and Dame, with limits of pH 5.8 and under for PSE meat14,18,22. For DFD meat, the strictest were Fletcher, and Petracci et al., with limits of 5.81 and 6.043,15. Our results, which are presented in Table 1, show that pH values of the m. pectoralis major (15 minutes after slaughter) of the different broiler origins are from 6.05 (Hubbard 50 days old) to 6.44 (Cobb 42 days old). A similar situation was found for pH 24 and 48 hours after slaughter. According to Ristic and Dame, pH values 24 hours after slaughter of different broiler origins were 5.84 for Cobb and 5.71 for Ross5. In our results, these pH values for both breed lines were higher (Cobb 6.03 and Ross 6.19 – 42 days old; Cobb 5.90 and Ross 5.85 – 50 days old; Table 1). Age of broilers had an impact on the meat quality parameter, pH value.