Laying performance, immune response, serum biochemical parameters and egg quality traits of female turkeys fed diet incorporated with organic selenium

An experiment was conducted to investigate the effects of organic selenium (Se) supplementation on laying performance, immune response, serum biochemical parameters and egg quality traits of female turkeys. Female turkeys (96; 16 wks old) were randomly distributed into 4 treatment groups with 4 replicates and 6 birds each (4 × 4 × 6) for a period of 24 weeks. The basal diet (T1) contained 0 mg Se/kg diet and the three experimental diets were supplemented with 0.2, 0.4 and 0.6 mg Se/kg diet (T2, T3 and T4 respectively). Age at sexual maturity, egg number and egg weight differed significantly in 0.4 mg Se/kg treated group (T3) than the other dietary treatment groups (T2 or T4). Humoral (29th weeks) and in vivo cell mediated immune response (30th weeks) were significantly improved in 0.4 or 0.6 mg Se treated group. Se supplemented groups, i.e. T3 and T4 decreased significantly in serum cholesterol and uric acid concentration whereas significant increase were recorded in total protein, albumin and alkaline phosphatase (ALP). No significant differences were observed in serum aspartate amino transferase (AST) and alanine amino transferase (ALT) concentration among the experimental groups. Egg quality traits, viz. shape, albumin and yolk index, shell thickness did not differ significantly among Se supplemented groups, whereas albumin and yolk weight and Haugh unit score were significantly higher in 0.4 mg Se/kg treated (T3) group. Thus, this study demonstrates that that dietary supplementation of 0.4 mg/Se kg diet has a beneficial effect on laying performance, immune responses, serum biochemical and egg quality traits in laying turkeys.