Muscle from 3-month old individuals of different sizes was used for transcriptome analysis. After screening, 39005 unigenes were annotated into four databases, including Nr (38833, 52.9%), Swissprot (337479, 46.0%), COG (10926, 14.8%) and KEGG (19791, 26.9%). Finally, the results was annotated by Nr database which defined the maximum number of unigenes.