Effect of Aging Methods for Meat Quality of Pasture-fed Beef

Abstract

　The objective of this study was to investigate the meat quality of Japanese Brown (Kumamoto) (JB-K, n = 3) and Japanese Black (JB, n = 3) steers fed by grazing year-round outdoors on pasture. The peroxide value of the rib loin (longissimus thoracis muscle) for JB steers was lower (P < 0.05) than that of JB-K steers. Coliform numbers were be less than or equal to 10 CFU/g in any samples. The free amino acids content of the rib loin of JB-K steers increased (P < 0.05) by aging. On the other hand, the carnosine content of the rib loin decreased (P < 0.05) by only cold storage compared with Hyo-On treatment.