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Effects of early weaning on digestive enzyme activities ([A] α-amylase, [B] trypsin, [C] lipase, [D] maltase, [E] sucrase, [F] Aminopeptidase-N, and [G] leucine aminopeptidase) of duodenum content of 25-day-old squabs in two groups. CON group: control group; EW group: test group, squabs were fed by parental pigeons for first 6 d after hatching, and then fed by hand. Values means n = 8 for the analysis of the intestine form. Data are means ± SEM. * means P < 0.05; ** means P < 0.01.
