This experiment was conducted to investigate the effects of different chromium propionate (CrPro) level in nitrogen-free diets (NFD) on organ indexes, intestinal mucosa morphology and serum parameters of rats. According to body weight, a total of 36 weaned Sprague Dawley (SD) rats were allotted to 3 treatments with 6 replicates per treatment and 2 rats per replicate. Rats were fed a basal NFD (control group) containing 0.08 mg/kg chromium (Cr), meanwhile, the basal diets supplemented with 0.2 or 1.0 mg/kg Cr from Cr for 21 days. The results showed that: 1) dietary supplemented with 0.2 mg/kg Cr significantly improved spleen index (P<0.05). 2) Dietary supplemented with 1.0 mg/kg Cr significantly increased the ratio of villous height to crypt depth (P<0.05). 3) Compared with the control group, dietary supplemented with 1.0 mg/kg Cr significantly improved serum albumin and uric acid contents (P<0.05), dietary supplemented with 0.2 mg/kg Cr significantly improved serum uric acid content (P<0.05). It is concluded that under NFD condition, the proper Cr supplementation has some effects on improving immune organs indexes, intestinal mucosa morphology and serum protein metabolism.
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