Study on Immune Function of Native Chicken under Different Feeding Patterns
This experiment was conducted to explore the effects of different feeding modes on the survival rate,immunoglobulin,antibody titer and immune organ index of native chickens.A total of 180 50-day-old healthy native chickens were selected and divided into ground level group,understory stocking group I and understory stocking group Ⅱ.The results showed that the survival rate of understory stocking group I was 95％at 120 days of age,and that of the other two groups was 88.3％.At 90 and 120 days of age,the contents of serum IgA,IgM,and the antibody titers of H5 subtype AIV in understory stocking group I and group Ⅱ were significantly higher than those in the ground level group(P<0.01 or P<0.05).At 90 days of age,the antibody titer of NDV in understory stocking group I was not significantly different from that in the ground group.The thymus index of understory stocking group I was significantly higher than that of group Ⅱ(P<0.05),and the spleen index of the two groups was significantly higher than that of the ground level group(P<0.01).There was no significant relationship between bursal index in all groups.Planting grass could improve the survival rate of native chickens,and the immune function was not significantly different from that of free stocking under the forest,which was better than that of ground level raising mode.
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