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Inluence of Phe treatments on digestive enzymes synthesis and release of PTS of dairy calves. (A, C, and E) The synthesis of the α-amylase, trypsin, and lipase respectively in PTS homogenate from 60 min to 180 min. (B, D, and F) The release of α-amylase, trypsin, and lipase respectively in PTS cultured medium from 60 min to 180 min. Data are expressed as means ± SEM, n = 3. * means significantly different (P < 0.05).
