Fig. 1

Effects of in ovo feeding of L-arginine on intestinal morphological structure of layer chicks. A, D and G were the duodenum on d 3, 14 and 42 respectively; B, E and H were the jejunum on d 3, 14 and 42 respectively; C, F and I were the ileum on d 3, 14 and 42 respectively. ^a-bValues at the same index with no common superscripts differ significantly (n = 8; P < 0.05). NC, non-injected control group; SC, saline-injected control group; Arg6, injected with 6 mg Arg; Arg10, injected with 10 mg Arg