Feed efficiency makes up a large part of sheep production, which also has a crucial impact on the economic benefits of producers. This study explores the polymorphism of gene associated with feed efficiency and detects the expression characteristics of in ten tissues of Hu sheep. The polymorphism of was recognized by using PCR amplification and Sanger sequencing, KASPar technology was used for genotyping subsequently, and the relationship between SNP and RFI is also studied. The results indicated that an intronic mutation g.24799148 C > T (rs 423395741) was identified in , and association analysis showed that the SNP g.24799148 C > T (rs 423395741) was significantly associated with RFI at 100-120, 100-140, 100-160, and 100-180 days ( < 0.05). The quantitative real-time PCR (qRT-PCR) result showed that was expressed in ten tissues, and the expression of gene in rumen tissue was significantly higher than in the other tested tissues. Therefore, these results indicated that the mutation locus may be used as a candidate molecular marker for evaluating the feed efficiency of Hu sheep.
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