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This study was conducted to investigate the effect of dietary egg yolk antibody (IgY) powder supplementation on the growth performance, blood component profile, intestinal microflora, and immunoglobulin G in ducks. A total of 300 1-day-old ducks (Cherry Valley) were randomly divided into 5 groups, with 3 replicates of 20 birds. The treatment groups were the negative (NC), positive (PC), egg yolk antibody powder 0.1% (T1), egg yolk antibody powder 0.5% (T2), and egg yolk antibody powder 1.0% (T3) groups. In the growth performance of ducks during the entire experimental period, the IgY groups and positive control group (PC) showed significantly higher (P<0.05) body weights and body weight gains compared to the negative control group (NC). However, no significant differences were observed in the feed intake and feed conversion ratio. The blood component profiles showed that the IgY 0.1 and 1.0% groups decreased in total cholesterol content compared to the NC group. The aspartate aminotransferase (AST) and alanine aminotranferease (ALT) contents were lower in the IgY 1.0% group, but there were no significant differences. Regrading the leukocyte content after feeding IgY, the heterophil: lymphocyte ratio decreased in the IgY groups, especially in the IgY 0.1% group, which had a lower content than the other groups. However, these results showed no significant differences. The Lactobacillus count in the intestines significantly increased (P<0.05) in the IgY 0.1 and 0.5% groups, the level of IgY increased, and the Escherichia coli count decreased. However, no significant difference was observed in the total plate count. The immunoglobulin G content was lower in the IgY groups than in the NC group, and compared with the IgY groups, the IgY 0.5% had a lower content, which was not a significant difference (

han'gug ga'geum haghoeji/han-guk gageum hakoeji

Effects of Egg Yolk Antibody Powder (IgY) Supplementation on Growth Performance, Blood Component Profile, Intestinal Microflora, and Immunoglobulin G in Meat Ducks