| Three experiments were undertaken with attempt to develop Chinese Medicinal Herb (CMH) of Mangifera . indica L . leaf applying in animal production. Experiment 1 was conducted to study on inhibiting effect in vitro of extract of Mangifera . indica L . Leaf on some pathogenic bacteria and NDV replication. Experiment 2 was conducted to study on feeding local yellow chicks with compound CMH of Mangifera . indica L . Leaf replacing CTC. Experiment 3 was conducted to study on meat qualities and the composition of PUFA in muscles of local yellow chicks with feeding compound CMH of Mangifera. indica L. Leaf.In experiment 1: An inhibiting-bacteria test was done about effects of extract of Mangifera . indica L . leaf on some pathogenic bacteria of domestic animaland poultry by using paper method, and an inhibiting-NDV experiment by extract of Mangifera . indica L. leaf with chicken embryos infected artificially wascarried out. The result of Inhibiting-bacteria test showed that extract of Mangifera . indica L. leaf has strong inhibiting effect on Escherichia coll., Salmonella pullorum, Riemerella anatipestifer, Pasteurella multocida, E. rhrsiopathiae, Staphylococcus aureus, streptococci .The results of inhibiting-NDV showed that at 48h the chicken embryos protective rate of NDV control group and 2.5g/ml+NDV group were 10% and 63.64% respectively. There was significant difference between groups (P<0.05). The protective rate of 1.25g/ml+NDV group, 0.625g/ml+NDV group and 0.313g/ml+NDV group were 72.72%,70.00%,69.23% respectively. There were extremely significant differences (p<0.01) compared with NDV control. .It was suggested that extract of Mangifera. indica L. leaf has inhibiting -NDV effects .In experiment 2, Three hundred and ninety-six 1-d-old local yellow female chicks were randomly divided into six treatments (two replicates pens per treatment, 33 birds per replicate) to study the effect of feed compound Chinese Medicinal Herb(CMH) of Mangifera . indica L. leaf replacing chlortetracycline(CTC) on the growing performance of local yellow female birds. There are Cl(control), H2(0.5%CMH), H3(1%CMH), H4(2%CMH), HA5 (0.5%CMH+CTG) and A6 (CTC). In phase 1(1-49 day-old), fed basic diet and test diets supplemented with CMH(1) or CTC and phase 2 (63-134 day-old ) fed basic diet and test diets supplemented with CMH(2) or CTC respectively; At the end of this experiment, The meat quality were determined. The results showed that: CMH can improve the growth performance and feed conversion ratio (FCR)of birds to a certain degree. In 1-49 day old phase, compared to the control, average day gain(ADG) of groups H2, H3, H4, HA5, A6 were increased by 3.39%(P>0.05), 5.09%(P>0.05), 6.21%(P>0.05X 1.13%(P>0.05)and4.71% (P>0.05) ;FCR was decreased by 3.24% ( P<0.05),7.84% ( P<0.05 ), 9.46% (P<0.05)4.05% (P<0.05) and 9.19% (P<0.05) respectively. In 63-134 day-old phase, compared to the control, ADG of groups H2, H3, H4, HA5, A6 were increase by 5.71%(P>0.05), 6.42% ( P(0.05), 7.60% ( P<0.05), 2.51%(P>.05) and 3.21% (P>.05) ;FCR was decrease by 5.43% (PO.05 X 7.57% (PO.05 X 8.39% (P<0.05), 3.62% (P>.05) and4.61% (P>.05) respectively.Atthe age 6f 49 day-old, The size of bursa Fabricii was extremely significant smaller (P<0.01) in Groups H4, A6 than in control respectively. The chicks also had higher levels of albumin in serum. The quantity of Lactobocillus in Caecum in Groups H4 was boosted (P<0.01) . There were no significant effect on meat quality, such as cooked meat ratio, water lose ratio, ratio of stored water lose and PH value, with feeding CMHIn experiment 3, Two hundred and forty-eight 88 -d-old local yellow female chicks were randomly divided into five treatments(two replicates pens per treatment, 32 birds per replicate) to study the effect of meat quality and fatty acid percentage in muscles of breast and thigh in local yellow birds with feeding Compound CMH of Mangifera . indica L . Leaf . Diets with H2(0.5%CMH), H3(l% CMH), 2% H4 (CMH) and basic diet as Cl (control) were fed respectively. The results showed that: to a cert...
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