Influence of slaughter age on the occurrence and quality characteristics of white striping and wooden muscle abnormalities
Received: Jan 23, 2022 ; Revised: Mar 18, 2022 ; Accepted: Mar 30, 2022
Published Online: Apr 04, 2022
The aim of this study was to assess the occurrence of white striping (WS), wooden (WB), and white striping combined with wooden (WS/WB) muscle abnormalities at different slaughter ages (34, 41, 48 days). In addition, the influence of these muscle abnormalities at different slaughter ages on quality characteristics (physical dimensions, pH, color index, and chemical composition) was studied. Overall occurrence of muscle abnormalities was 45%, 92%, and 100% at slaughter ages of 34, 41, and 48 days, respectively. With increasing slaughter age, the occurrence of white striping combined with wooden increased dramatically. It was found that the occurrence of muscle abnormalities was not similar in the same bird (left and right fillets). About 39% of the left and right fillets of the same bird had different muscle abnormalities. Breast fillets affected by muscle abnormalities had significantly (p<0.05) higher weight than normal fillets. At slaughter age of 34 days, normal fillets had significantly higher L*-values (67.37 vs. 61.73 and 63.05, p<0.05), lower a*- values (3.25 vs. 4.87 and 5.18, p<0.05), and b*- values (4.02 vs. 5.20 and 5.99, p<0.05) than white striping and white striping combined with wooden fillets; respectively. The changes in chemical composition due to muscle abnormalities were more significant at high slaughter age than at low slaughter age. In conclusion, the occurrence of muscle abnormalities was strongly influenced by slaughter age and a similar pattern was observed for the effects on quality characteristics.