Effects Of Different Levels Of Yucca Extract On Growth Performance, Blood Biochemical Indexes And Nutrient Utilization Of Broilers

Two experiments were used to study effects of different level of Yucca extract on the growth performance, blood biochemical indexes and nutrient utilization of broiler chickens.A growth experiment was conducted to study the effects of Yucca extract on growth performance, blood biochemical indexes in broilers. A total of seven hundred and twenty day-old Arbor Acres broiler chicks were randomly divided into 6 treatments with 3 replicates. treatment 1,the positive control, was fed with basal diet only and Treatment 2, the negative control, was fed with basal die reducing of 0.5% crude protein, treatments 3 to 5 were fed basal diet supplemented with Yucca extract (60, 120, 240 of positive control diet , and 120 mg/kg of negative control diet), The results show that, Supplementing the different levels of yucca extract with basal diet , average daily gain of broilers increased of a different degree with yucca extract added (P < 0.05), average feed intake and F/G with different degree of reduction. Which supplemented with yucca extract in low protein diets, the average daily feed intake and F/G were lower (P < 0.05) than negative control group significantly, average daily gain was higher than the negative control group significantly (P < 0.05). In the 21d and 42d, the negative control group with adding yucca treasure, the blood urea nitrogen concentration was significantly lower than the negative control group (P < 0.05), total cholesterol and triglyceride levels was downward trend with the increasing of yucca, was not significant difference with the negative control group, (P > 0.05). In the 21d, the positive control of adding yucca 60,120 mg/kg group, the blood urea nitrogen concentration was significantly lower than the positive control group (P < 0.05), total cholesterol and triglyceride levels was downward trend with the adding of yucca, was not significant with the positive control group (P > 0.05). In the 42d, the positive control of adding yucca ,the concentration in the blood urea nitrogen was significantly lower than the positive control group (P < 0.05), the positive control group of adding yucca 240mg/kg ,the triglyceride content was significantly lower than the positive control group ( P < 0.05). A metabolism experiment was conducted to study the effects of Yucca extract on nutrient digestibility in broiler fed different diets. Six-three 1-day-old Arbor Acres broilers were divided into 7 treatments with 3 replicates. Treatment 1, the positive control, was fed with basal diet only and Treatment 2, the negative control, was fed with basal die reducing of 0.5% crude protein, treatments 3 to 6 were fed basal diet supplemented with one of 3 levels of Yucca extract (60, 120, 240 of positive control diet , and 120 mg/kg of negative control diet), treatments 7 was endogenous determination group. the results show that, supplementing with different levels of yucca extract in diets increased significantly on the apparent protein and energy and real metabolic rate (P < 0.05), and adding yucca extract was upward trend. The apparent protein and energy metabolism of the control group were 51.18% and 75.07%, compared with the positive control, adding 60, 120, 240 mg/kg yucca extract, protein apparent metabolic rate increased by 4.10% , 5.01%, 11.21%, energy apparent metabolic rate increased by 1.81%, 4.74%, 5.03%.the protein and energy of real metabolic rates of positive control were 62.94% and 75.24%, compared with the positive control, adding 60, 120, 240 mg/kg yucca extract, the true metabolic rate of the protein were increased by 3.69%, 4.57%, 9.47%,energy of real metabolic rate increased by 1.81%, 4.73%, 5.02%. In the negative control group adding the basis of 120 mg/kg yucca extract, compared with the negative control, the apparent metabolic rate of protein increased of 4.05%, the true protein metabolic rate increased 10.32%, energy of the apparent metabolic rate increased of 2.37%, the real energy metabolic rate increased of 2.45%.The experiment showed that: adding yucca extract with diet improved the production performance of broiler, reduced blood urea nitrogen content, but the blood total cholesterol and triglyceride content was not significant. Adding yucca extract increased the rate of the apparent and real of protein and energy metabolic.