Effect Of Casein Phosphopeptides On Growth Performance, Mineral Metabolism And Immune Function Of Broilers

There were two experiments in the study.In the first experiment 60 1-day-old AA broilers (female:male=l:l)were divided randomly into 2 groups, with 3 replications per group, 6 broilers for each replication. The broilers in the control group fed with basal diet (Ca: 0.7%), the broilers in the trial group fed with basal diet adding 0.5% Casein Phosphopeptides. The raising period was 3 week. The feeding experiment was carried out to study the effect of CPP on growth performance, the trace element content of tissue organs and the immune function of broilers. In the second experiment adopted 2X3 two-factors design. The two different levels of Ca in diets were 0.5%, 1.0% respectively; the three different levels of CPP were 0%, 0.1%, 0.5%. 114 1-day-old A A broilers (female:male=l:l) were divided randomly into 6 groups, with 4 replications per group, 6 broilers for each replication. The raising period was 4 week. The feeding experiment was carried out to study the effect of CPP on growth performance, the trace element content of tissue organs and the immune function of broilers.The results of the first experiment were summarized as follows:1. Final weight, average daily gain (ADG), feed conversion ratio (FCR), average daily feed intake (ADFI) of broilers had no significant differences (P>0.05) between trial group and control group.2. Compared with the control, blood erythrocyte number, hemoglobin and erythrocyte pressure in trial group had no significant differences (P>0.05); Ca, Cu, Fe of serum had no significant differences (P>0.05) between control group and trial group; Zn of serum had greatly significant difference(P<0.01) between control group and trial group; Alkaline phospatase (ALK) activities of serum had greatly significant difference (P<0.01) between control group and trial group.3. Compared with the control , length, ash, Ca, P in shin bone had no significant differences (P>0.05), while shin bone weight had significant difference (P<0.05) in the trial group. Fe, Cu, Zn in Liver, shin bone or muscle had no significant differences (P>0.05) between control group and trial group. The Mn of liver had greatly significant difference (P<0.01) between control group and trial group.4. Compared with the control, the weights of thymus, of spleen, of bursal and immune parameter in trial group had no significant differences (P>0.05); IgA and IgG level in serum had greatly significant differences (P<0.01) between control group and...