2013 Volume 56 Issue 2 Pages 151-157
We investigated the effects of supplementation of rice bran (RB) or calcium soap fatty acid (CSFA) derived from embryo buds of rice on meat production, the physico-chemical characteristics, and sensory evaluation in Japanese Black steers during the later fattening period. For the first and second half fattening periods, concentrates and roughage were given to 11 Japanese Black steers at 9 months of age for 6 months. After 16 months of age, each steer was allocated to one of the following three treatments: concentrates only for second half fattening period (4 animals: control), 8.0% replacement of concentrates with RB on a fresh matter basis (3 animals: RB), and 1.5% replacement of concentrates with CSFA (4 animals: CSFA). Then they were fed until 28 months of age. No significant difference was found among treatments in feed intake or meat production (growth, carcass traits, etc.). The USFA and MUFA concentrations in beef fat of RB and CSFA groups tended to be higher than those in the control group (P<0.1), but the fat melting point tended to be lower in supplementary treatment groups (P<0.1). Furthermore, the CSFA beef had better flavor and aroma than the control beef did, indicating higher overall quality of the former type of beef. In conclusion, neither supplementation of RB nor CSFA for Japanese Black steers affected meat production. However, these supplements were apt to increase USFA and MUFA concentrations in beef. CSFA supplementation especially engendered higher meat quality.