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Fig. 1 | BMC Veterinary Research

Fig. 1

From: Effects of different feeding regimens with protease supplementation on growth, amino acid digestibility, economic efficiency, blood biochemical parameters, and intestinal histology in broiler chickens

Fig. 1

A photomicrograph of chicken intestinal tissue sections highlighting normal histological structure in cross-section of the duodenum in group I (AC), group II (D), group III (E, F), group IV (G, H), group V (I), and group VI (J, K, L). Villus (V), crypt (c), goblet cells (arrows), and tunica musculosa (M). Stain: H & E in (A, E, J, K, L), alcian blue (D, G, H), and PAS in (B, C, F, I). I (FR1 − VE): recommended protein SBM diet without protease supplementation, II (FR1 + VE): recommended protein SBM diet + protease supplementation, III (FR2 − VE): low-protein SBM diet without protease supplementation, IV (FR2 + VE): low-protein SBM diet + protease supplementation, V (FR3 − VE): low-protein SBM/DDGS-SFM diet without protease supplementation, VI (FR3 + VE): low-protein SBM/DDGS-SFM diet + protease supplementation

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