Abstract
This study aimed to assess the effect of different levels of processed soybean meal (PSBM) on growth performance, immune responses, intestinal morphology, cecal bacterial count, carcass characteristics, and blood parameters of broilers. A total of 560 Ross 308 broiler chickens were randomly assigned into seven groups. The control group received a basal diet containing a standard soybean meal. The groups S1, G1, and F1 received diets containing 2.5% of PSBM at the starter, growing, and finishing periods, while S2, G2, and F2 groups have received diets containing 5% of PSBM. The results showed that the average daily weight gain and feed conversion ratio were significantly better in the groups fed the diet containing 5% PSBM than in others. A significant decrease was observed in the pancreatic parameters of the G2 and F2 groups compared to the control. Additionally, PSBM replacement did not affect the villus length of all intestinal regions (p>0.05). Nevertheless, increasing dietary PSBM content has reduced intestinal goblet cell number (p
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