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This experiment was conducted during the period from February 2017 until June 2018. The experiment was designed to study the relationship among immune response to the SRBC antigen, and some endogenous antioxidant enzymes activities in chickens. The results can be summarized in the following points: 1-The highest activity of the catalase enzyme was achieved in the low immunity group of Norfa chickens, whereas the lowest activity of the catalase enzyme was in the high immunity one while the control group was medium between the two groups. 2-Studing the relationship between superoxide dismutase activity and immune response to antibody indicated that, the highest activity value of superoxide dismutase was recorded for the low immunity group. On the other hand, the lowest activity of (SOD) was observed in the high immunity group. 3-The relation between Malondialdehyde concentration (oxidative stress) and immunity groups indicated that, there were no significant differences between the high immunity group and the control one in MDA concentration. There were significant differences between the low immunity group and the two others. 4-The present results demonstrated that there were highly significant (P ≤ 0.01) negative correlation between antibody titers and both CAT and SOD antioxidant enzymes activities. While MDA concentration had highly significant positive correlation with antibody titers.

The aim of the present study was to determine the concentration of maternal antibody (IgY) in blood serum and egg yolk of three, control, high and low IgY antibody lines of Sinai and Silver Montazah local chickens in relation to some productive traits in chicken. The results were discussed and summarized as follows: 1-Sinai strain had significantly higher IgY antibody concentration than Silver Montazah strain of chickens, being 4.68 vs 4.22 mg/ml in hen blood serum, 4.11 vs 3.46 mg/ml in egg yolk, 3.09 vs 2.66 mg/ml in hatched chicks serum and 48.00 vs 38.41 mg/egg yolk total, respectively. 2-Highly significant differences (P<0.01) among lines, the high lines harvested the highest IgY level and control lines occupied intermediate level, where the low lines had the lowest IgY level in both strains of chickens. 3-The transferred (%) of IgY were 66.24 vs 62.88 (%) from dams to newly hatched chicks in Sinai and Silver Montazah strains of chicken respectively. 4-The IgY (%) transferred from dams to newly hatched chicks were 67.21 vs 61.89 (%) for control lines, 76.47 vs 71.67 (%) for high lines and 58.17 vs 52.06 for low lines of Sinai and Silver Montazah strains of chickens respectively. 5-There were strong positive highly significant simple correlation coefficients between IgY concentration in the layers and egg yolk (r=0.994 vs 0.934), between layers and chicks (r= 0.937 vs 0.879) and between egg yolk and chicks (r= 0.930 vs 0.908) in Sinai and Silver Montazah strains of chicken respectively. 6-The birds high in IgY antibody levels had significantly higher percentages of fertility, hatchability, livability, early age at sexual maturity, and higher egg production traits as compared to low birds in IgY antibody concentrations. 7-The present results, explained that the IgY antibody can be used as genetic marker to improve some productive traits in chickens.

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