| A total of 360 black梑one chickens were assigned to 2 treatments with 5 replicates of each treatment. The Control birds was fed with basal diet and the birds of the other group fed with basal diet supplemented with 0.1mg/kg Ti. Consumed feed and water ad libitum. Performance, deposition of protein and energy in the chickens, deposition of protein in the breast and the leg muscles of chickens and serum Ti and T1 concentration were examined at 2, 4, 6, and 8 weeks respectively. The results showed that accumulative growth was significantly higher in test group than in control group during the first 2 weeks (PK0. 05) and no significant effect in the two groups at other periods(P>0. 05). Body weight gain was no significant effect in the two groups (P>0. 05) , but according to the numerical value, Body weight gain of the test group was 12. 37%.~ 4.00% and 1.35% higher than that of the control group during ito 2 weeks, 3 to 4 weeks and 5 to 6 weeks of age respectively and 6. 54% lower during 7 to 8 weeks oI~ age. Relative growth ratio of the test group was significantly lower than that of the control group (P<0.05) during 7? weeks of age and was no significant effect in the two groups during other periods (P>0. 05) . Neither food intake nor feed efficiency was influenced significantly by treatments at all periods. In the light of numerical value, feed intake of test group was more during the first 4 weeks and less during the later 4 weeks than that of control group. While feed efficiency of test group was higher during the first 6 weeks and lower during the later 2 weeks than that of control group;T and TSH concentration had no significant effect by treatment ( P>0.05 ) ,T1 and (;H concentration was significantly lower in test group at the 8th weeks (P<0.05) and had no significant effect at other periods (P>0. 05) ;Deposition of protein and in the black梑one chickens and deposition of protein in the breast and leg muscles of chickens had no significant effect by treatment (P>0.05) . In accordance with the numerical value, those of test group were more than that of control group. Deposition of energy had no significant effect by treatment. It is suggestediithat: l.T~ added to the black梑one chickens diet stimulates growth at early period and retard at later period. There was such a tendency: 0. 1mg/kg Ti Added to the black梑one chickens diet has the positive effects on feed efficiency during the early period and deposition of protein and protein retention efficiency in the black梑one chickens and deposition of protein in the breast and leg muscles of chickens , but it?s quite necessary to make a further study to investigate the most appropriate dose. 2. When the serum Ti and T1 concentration was the highest GH concentration and relative growth ratio were the highest, when Ti and T4 concentration were the lowest , relative growth ratio was the lowest. Except that Ti and GH concentration significantly lower in test group at the end of the trial as 0. 1mg/kg TI added to the black梑one chickens diet, 4 kinds of hormone had no significant difference in two groups, but according to the date, Ti and L concentrations of test group were lower than that of control group at all periods. 3. Deposition of energy had no significant effect in two groups(P>0.05)Author:Gao Fengxian(Animal Nutrition and Feed Science) Directed by: Prof He Jianhua... |
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