Abstract
The objective of this study was to identify myogenic proteins associated with caloric restriction and feed efficiency in bovine longissimus dorsi muscle. Thirty-one Korean native steers were allocated to 100% ad libitum (n = 16) or 80% of ad libitum (n = 15) groups. Regardless of nutritional level, a subset of these animals were assigned to groups with high or low feed efficiency (n = 5) at a later time point based on feed efficiency. A total of 7 differentially expressed proteins were found between groups with different nutrition levels while a total of 12 differentially expressed proteins were found between groups with different feed efficiencies. Interestingly, heat shock protein beta-1 (HSPB1) was a differentially expressed protein that showed up in both results (nutrition level and feed efficiency). It was up-regulated in both the 80% ad libitum group and the high feed efficiency group. In in vitro study, mRNA expression level of HSPB1 was increased (P < 0.05) after myogenic differentiation. Results of this study suggest that HSPB1 might be a myogenic protein involved in response to caloric restriction and feed efficiency in longissimus dorsi muscle of Korean native steer.
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