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Inluence of Phe treatments on digestive enzymes gene expression of PTS of dairy calves. (A) The α-amylase gene expression. (B) The trypsin gene expression. (C) The lipase gene expression. Data are expressed as means ± SEM, n = 3. ‘—’ means the significant difference between two treatments at one time point. * means significantly different (P < 0.05).
