Effect Of Mini-peptide On Production Performance, The Apparent Metabolic Rate Of Nutrients And Immune Function In Laying Quails

This experiment was to investigate the effect of mini-peptide on production performance, apparent metabolic rate of nutrients and immune function in laying quails. 270 eighty-three days laying quails(longcheng) were randomly allotted to 5 treatments, each treatment represented by 3 replicates of 18 birds each. Laying quails in treatmentsâ… ,â…¡,â…¢,â…£andâ…¤received basal diets with the addition of 0, 0.1%, 0.3%, 0.5%, 0.7% mini-peptide The experiment lasted four weeks. The egg production, feed efficiency, average egg weight, feed intake/day and apparent metabolic rate of nutrients were statisticed. The activity of alkaline phosphatase (AKP),calcium (Ca),phosphorus (P),total protein,albium,BUN,T₃,T₄,IgG,IgM were analyzed. The results were as follows:â‘ Laying Quails fed Minic-peptide could increase the production performance and economic efficiency. Compared with the control group, the egg production of groupâ…¡,â…¢,â…£andâ…¤increased by 6.55% (P＜0.05),7.22% (P＜0.05),10.04% (P＜0.01),15.27% (P＜0.01); the egg weight of groupâ…¡,â…¢,â…£andâ…¤increased by 2.58% (P＞0.05),6.44% (P＜0.01),4.97% (P＜0.01),3.96% (P＜0.05); decreased the feed /eggs by 3.37% (P＞0.05),9.09% (P＜0.05),11.45% (P＜0.05),15.82% (P＜0.05). The trial groups were increase the economic efficiency, and the addition of 0.7% mini-peptide was the best.â‘¡Laying Quails fed Minic-peptide could increase the apparent metabolic rate of nutrients. Compared with the control group, the apparent metabolic rate of CP increased by 2.10% (P＞0.05),8.05% (P＜0.05),8.40% (P＜0.05),6.93% (P＞0.05); the apparent metabolic rate of CF increased by 1.60% (P＞0.05),3.20% (P＜0.05),12.80% (P＜0.01),16.00% (P＜0.01); the apparent metabolic rate of Ca increased by 4.11% (P＜0.05),6.38% (P＜0.01),15.70% (P＜0.01),11.41% (P＜0.01); the apparent metabolic rate of P increased by 7.02% (P＞0.05),8.16% (P＞0.05),10.47% (P＜0.05),13.10% (P＜0.05). The addition of 0.5% Minic-peptide increased the serum Ca and P. The addition of 0.5% Minic-peptide increased the serum AKP. The addition of 0.7% Minic-peptide decreased the UN.â‘¢Laying Quails fed Minic-peptide could improve the quality of the eggs. The addition of 0.5% Minic-peptide improved egg protein comparative weight,eggshell thickness and HU significantly (P＜0.05). There were no significant differences(P＞0.05) in egg-shape index and egg yolk comparative weight between the trial group and the control group.â‘£Laying Quails fed Minic-peptide could increase the height of the small intestine'villus. Compared with the control group, the height of the duodenum'villus increased by 18.82% (P＜0.01),22.35% (P＜0.01),23.53% (P＜0.01),23.94% (P＜0.01); the height of the jejunum'villus increased by 2.70% (P＞0.05),21.62% (P＜0.01),37.84% (P＜0.01),70.27% (P＜0.01); the height of the ileum'villus increased by 22.86% (P＜0.01),46.39% (P＜0.01),57.82% (P＜0.01),64.20% (P＜0.01). ⑤Laying Quails fed Minic-peptide could improve the immune function. The trials all increased immune organs weight of quails and the content of serum IgG and IgM, Compared with the control group, the content of serum IgM of groupâ…¢,â…£,â…¤increased by 7.41% (P＜0.05),11.11% (P＜0.01),11.11% (P＜0.01). The addition of 0.5% Minic-peptide increased the serum TP and ALB. The trials also decreased BUN, at the same time increased the T3,T4.Conclusion: The addition of 0.7% Minic-peptide can increase the production performance and economic efficiency. The function of Minic-peptide in increased feed efficiency, increasing the feed conversion ratio was related to improve the length of the small intestine'villus and immune function.