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Real time PCR analysis of mRNA expression changes of genes involved in mammary metabolism of cows fed corn stover (CS) and alfalfa hay (AH). Relative mRNA expression levels were normalized by the levels of β-actin. Error bars represent the standard deviation. ** and * indicate that the difference in gene expression between CS and AH groups reached p < 0.01, and 0.01 < p < 0.05, respectively
