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The periodic acid–Schiff staining of goblet cells in duodenum, jejunum and ileum villus of 21-day-old broilers (Arrows point to goblet cells). NC, a basic normal corn–soybeandiet; CS, a corn–soybean–based diet supplementation with 20% corn starch (CS); 4% RS, 8% RS, and 12% RS, the corn–soybean–based diets supplementation with 4%, 8%, and 12% corn resistant starch (RS), respectively. Image, magnification at ×200.
