Effects of astaxanthin and esterified glucomannan on hematological and serum parameters,and liver pathological changes in broilers fed aflatoxin‐B1‐contaminated feed

The effects of astaxanthin (ASTA) and esterified glucomannan (EMG) on hematological and serum parameters, and liver pathological changes in broilers fed on aflatoxin‐B1 (AFB1) contaminated diet were investigated. Two hundred and forty 10‐day‐old broilers were randomly assigned to one of five dietary treatments including: (i) control diet; (ii) AFB1‐contaminated diet; (iii) AFB1 + EGM diet; (iv) AFB1 + ASTA diet; and (v) AFB1 + EGM + ASTA diet. At 35 days old, blood and liver tissue samples were collected for analysis. Results indicated that total white blood cell (WBC) number, hemoglobin (Hgb) concentration, hematocrit (Hct) level, serum alanine amino transferase (AST) and γ‐glutamyl transferase (GGT) activities, red blood cell (RBC) number, serum globulin (GLB) and urea nitrogen (BUN) concentrations (P < 0.05) were increased by feeding AFB1‐contaminated diet. EMG and ASTA alleviated the alteration of RBC, WBC, Hgb and AST caused by AFB1‐contaminated diet. Liver superoxide dismutase (SOD) activity was reduced, while myeloperoxidase (MPO) activity was increased by AFB1‐contaminated diet (P < 0.05). Both EGM and ASTA restrained the increase of MPO activity (P < 0.05). Degeneration of the liver tissues was found in broilers fed AFB1‐contaminated diet. It suggested that feeding 0.4 mg/kg AFB1‐contaminated diet resulted in adverse effects on blood parameters and liver morphology. Dietary addition of EGM addition at 5 g/kg diet, ASTA at 10 mg/kg diet and especially their combination showed positive protection effects on alleviating the alteration of feeding AFB1. The results indicated that supplementation of 5 g EGM/kg diet, 10 mg ASTA/kg diet and their combination could partially or greatly alleviate the adverse effects caused by AFB1, with the EGM+ASTA group receiving the most effective treatment.